Dr. Nick Cvetojevic Profile

Dr. Nick Cvetojevic

at Observatoire de la Côte d'Azur

SPIE Involvement:

Author

Publications (60)

Proceedings Article | 28 August 2024 Presentation + Paper

Presentation + Paper

Pushing high angular resolution and high contrast observations on the VLTI from Y to L band with the Asgard instrumental suite: integration status and plans

Marc-Antoine Martinod, Denis Defrère, Michael Ireland, Stefan Kraus, Frantz Martinache, Peter Tuthill, Fatmé Allouche, Emilie Bouzerand, Julia Bryant, Josh Carter, Sorabh Chhabra, Benjamin Courtney-Barrer, Fred Crous, Nick Cvetojevic, Colin Dandumont, Steve Ertel, Tyler Gardner, Germain Garreau, Adrian Glauser, Xavier Haubois, Lucas Labadie, Stéphane Lagarde, Daniel Lancaster, Romain Laugier, Alexandra Mazzoli, Anthony Meilland, Kwinten Missiaen, Sebastien Morel, Daniel Mortimer, Barnaby Norris, Jyotirmay Paul, Gert Raskin, Sylvie Robbe-Dubois, J. Gordon Robertson, Ahmed Sanny, Nicolas Schuhler, Owain Snaith, Adam Taras

Proceedings Volume 13095, 130950D (2024) https://doi.org/10.1117/12.3016296

KEYWORDS: Equipment, Spectrographs, Sensors, Lawrencium, L band, Calibration, Nulling interferometry, Astronomical interferometers, Spatial resolution, Control software

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Proceedings Article | 28 August 2024 Presentation + Paper

Presentation + Paper

Kernel nulling at VLTI with photonic lanterns for optimal fibre injection

Adam Taras, Barnaby Norris, Sorabh Chhabra, Nick Cvetojevic, Vincent Foriel, Michael Ireland, Stefan Kraus, Sergio Leon-Saval, Frantz Martinache, Jyotirmay Paul, Eckhart Spalding, David Sweeney, Peter Tuthill

Proceedings Volume 13095, 130950U (2024) https://doi.org/10.1117/12.3019569

KEYWORDS: Nulling interferometry, Equipment, Signal to noise ratio, Planets, Stars, Simulations, Wavefront sensors, Wavefront errors, Exoplanets, Quantum reading, Photonic devices

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Proceedings Article | 28 August 2024 Presentation + Paper

Presentation + Paper

L-band nulling interferometry at the VLTI with Asgard/NOTT: status and plans

Denis Defrère, Romain Laugier, Marc-Antoine Martinod, Germain Garreau, Kwinten Missiaen, Muhammad Salman, Gert Raskin, Colin Dandumont, Steve Ertel, Michael Ireland, Stefan Kraus, Lucas Labadie, Alexandra Mazzolli, Gyorgy Medgyesi, Ahmed Sanny, Olivier Absil, Peter Ábráham, Jean-Philippe Berger, Myriam Bonduelle, Azzurra Bigioli, Emilie Bouzerand, Josh Carter, Nick Cvetojevic, Benjamin Courtney-Barrer, Adrian Glauser, Simon Gross, Xavier Haubois, Noel James, Andras Peter Joo, Stephane Lagarde, Alain Léger, Jarron Leisenring, Jérôme Loicq, Guillermo Martin, Frantz Martinache, Gyorgy Mezo, Sébastien Morel, Johan Morren, Marc Ollivier, Gordon Robertson, Hélène Rousseau, Warrick Schofield, Nicolas Schuhler, Adam Taras, Bart Vandenbussche, Julien Woillez

Proceedings Volume 13095, 130950F (2024) https://doi.org/10.1117/12.3019922

KEYWORDS: Equipment, Planets, Nulling interferometry, Interferometers, Stars, Exoplanets, Sensors, Photonics, Observational astronomy, Design

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Proceedings Article | 28 August 2024 Presentation

Presentation

Status of FIRST spectro-interferometer on SCExAO: sensitivity study and characterization of 5-telescopes visible photonics integrated circuits

Manon Lallement, Elsa Huby, Sylvestre Lacour, Sebastien Vievard, Guillermo Martin, Harry-Dean Kenchington Goldsmith, Kévin Barjot, Olivier Guyon, Julien Lozi, Vincent Deo, Kyohoon Ahn, Miles Lucas, Cécil Pham, Cédric Cassagnettes, Daniel Rouan, Vincent Lapeyrere, Guy Perrin, Nick Cvetojevic, Frantz Martinache, Franck Marchis, Takayuki Kotani, Gaspard Duchene

Proceedings Volume 13095, 1309508 (2024) https://doi.org/10.1117/12.3018406

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Proceedings Article | 27 August 2024 Presentation + Paper

Presentation + Paper

Baldr: a Zernike wavefront sensor for VLTI/Asgard

Benjamin Courtney-Barrer, Gordon Robertson, Adam Taras, Julien Tom Bernard, Grace McGuinness, Fred Crous, Peter Tuthill, Mamadou N'Diaye, Connor Langford, Nick Cvetojevic, Denis Defrère, Stefan Kraus, Frantz Martinache, Marc-Antoine Martinod, Michael Ireland

Proceedings Volume 13097, 130971O (2024) https://doi.org/10.1117/12.3016212

KEYWORDS: Adaptive optics, Wavefront sensors, Design, Sensors, Matrices, Telescopes, Equipment, Turbulence, Pupil aberrations, Control systems

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Proceedings Article | 18 July 2024 Presentation + Paper

Presentation + Paper

MOSAIC at the ELT: a unique instrument for the largest ground-based telescope

Roser Pelló, Mathieu Puech, Éric Prieto, Myriam Rodrigues, Rubén Sanchez-Janssen, Gavin Dalton, Franck Ducret, Kacem El Hadi, María García-Vargas, Jeff Lynn, Nazim Bharmal, Diane Chapuis, Michel Dupieux, Clément Hottier, Marie Larrieu, Laurent Martin, Meghna Mohamed, Tim Morris, Ana Pérez, Walter Seifert, Wenli Xu, Simon Morris, Lex Kaper, Jesús Gallego, Jose Afonso, Beatriz Barbuy, Thierry Contini, Alexis Finoguenov, Susan Kassin, Christopher Miller, Göran Ostlin, Laura Pentericci, Daniel Schaerer, Matthias Steinmetz, Bodo Ziegler, Ricardo Araujo, Joar Brynnel, Bruno Castilho, Christopher Conselice, Nick Cvetojevic, Christopher Davison, Julien Dejonghe, Mirka Dessauges-Zavadsky, Kjetil Dohlen, Décio Ferreira, Armando Gil de Paz, Thiago Gonçalves, Isabelle Guinouard, Matthew Hayes, Derek Ives, Annemieke Janssen, Carol Kehrig, Andreas Kelz, Davor Krajnović, Audrey Lanotte, Nicolas Laporte, Philippe Laporte, Soren Larsen, Bertran Lemasle, Ian Lewis, Jiang-Tao Li, Elena Pancino, Matthew Pieri, Christian Surace, Markus Thurneysen, Susanna Vergani, François Wildi, Fernando Álvarez Moreno, Raziye Artan, Mathilde Beaulieu, Eva Besada, Arjan Bik, Charlotte Bond, Mohamed Bouri, Jérémie Boy, David Bramall, Sarah Brands, Antonio Braulio, Tim Butterley, Cristina Cabello, Marina Calero de Ory, Rocio Calvo, Africa Castillo Morales, Zalpha Challita, Stephen Chittik, Andrés Curto Maldonado, Fátima De Frontat, Elfi Dijkstra, Eddy Elswijk, Gilles Fasola, Carmen Feiz, Fabio Fialho, Johan Floriot, Paolo Franzetti, Marco Fumana, Luis Gabarra, Lia Garcia, Adriana Gargiulo, Julien Gaudemard, Domenico Giannone, Polly Gill, Alicia Gomez-Gutierrez, Carole Gouvret, Alan Guenther, Douglas Harvey, José Miguel Ibáñez Mengual, Jorge Iglesias, Yevgeniy Ivanisenko, Peter Kunst, Sander Kwast, Kieran Leschinski, Gianluca Licausi, Sebastiano Ligori, Juan Antonio López Orozco, Adam Lowe, Mike Macintosh, Héctor Magan, Manuel Maldonado, Thomas Marquart, Lucimara Martins, Marisole Melara, Jens Melinder, Jeannet Molema, David Montgomery, María Morales, Francisco Najarro, Nicolas Nardetto, Ramon Navarro, Antoine Ottomani, Tony Pamplona, Cyril Pannetier, Phil Parr-Burman, Sergio Pascual, María Peñataro, Isabel Pérez Grande, Jan Rinze Peterzon, Javier Piqueras, Nicolai Piskunov, Ramon Rodriguez Cardoso, Sergio Rodriguez Venzal, Rick Romp, Hossein Rostami, Frédéric Royer, Daniel Sablowski, Ainhoa Sanchez, Ernesto Sánchez Blanco, Ellen Schalling, Jurgen Schmoll, Noah Schwartz, Jay Stephan, Sylvestre Taburet, David Terrett, Ignacio Torralbo, Niels Tromp, Gerardo Veredas, Yanbin Yang, Alec York, Werner Zeilinger

Proceedings Volume 13096, 1309615 (2024) https://doi.org/10.1117/12.3019047

KEYWORDS: Equipment, Galactic astronomy, Spectrographs, Near infrared, Spectral resolution, Telescopes, Stars, James Webb Space Telescope, Design, Extragalactic astronomy

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SPIE Journal Paper | 30 November 2023 Open Access

Open Access

Machine-learning approach for optimal self-calibration and fringe tracking in photonic nulling interferometry

Barnaby Norris, Marc-Antoine Martinod, Peter Tuthill, Simon Gross, Nick Cvetojevic, Nemanja Jovanovic, Tiphaine Lagadec, Teresa Klinner-Teo, Olivier Guyon, Julien Lozi, Vincent Deo, Sébastien Vievard, Alex Arriola, Thomas Gretzinger, Jonathan Lawrence, Michael Withford

JATIS, Vol. 9, Issue 04, 048005, (November 2023) https://doi.org/10.1117/12.10.1117/1.JATIS.9.4.048005

KEYWORDS: Calibration, Data modeling, Signal to noise ratio, Education and training, Nulling interferometry, Equipment, Point spread functions, Wavefronts, Sensors, Optical path differences

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Proceedings Article | 5 October 2023 Presentation + Paper

Presentation + Paper

Photonic spectro-interferometry with SCExAO/FIRST at the Subaru Telescope: towards Hα imaging of protoplanets

S. Vievard, M. Lallement, E. Huby, S. Lacour, O. Guyon, N. Jovanovic, S. Leon-Saval, J. Lozi, V. Deo, K. Ahn, N. Cvetojevic, K. Barjot, G. Martin, H. D. Kenchington-Goldsmith, G. Duchêne, T. Kotani, F. Marchis, D. Rouan, M. Fitzgerald, S. Sallum, B. Norris, C. Betters, P. Gatkine, J. Lin, Y. J. Kim, C. Pham, C. Cassagnettes, A. Billat, M. Tamura, G. Perrin

Proceedings Volume 12680, 126800H (2023) https://doi.org/10.1117/12.2676319

KEYWORDS: Telescopes, Single mode fibers, Optical path differences, Spectrographs, Photonic integrated circuits, Polarization, Microelectromechanical systems, Calibration, Visible radiation

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Proceedings Article | 5 October 2023 Presentation + Paper

Presentation + Paper

The path to detecting extraterrestrial life with astrophotonics

Nemanja Jovanovic, Yinzi Xin, Michael Fitzgerald, Olivier Guyon, Peter Tuthill, Barnaby Norris, Pradip Gatkine, Greg Sercel, Svarun Soda, Yoo Jung Kim, Jonathan Lin, Sergio Leon-Saval, Rodrigo Amezcua-Correa, Stephanos Yerolatsitis, Julien Lozi, Sébastien Vievard, Chris Betters, Steph Sallum, Daniel Levinstein, Dimitri Mawet, Jeffrey Jewell, J. Kent Wallace, Nick Cvetojevic

Proceedings Volume 12680, 126800G (2023) https://doi.org/10.1117/12.2677951

KEYWORDS: Planets, Photonics, Stars, Exoplanets, Equipment, Astrophotonics, Wavefront sensors, Single mode fibers, Coronagraphy, Spectroscopy

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SPIE Journal Paper | 27 June 2023

High-angular resolution and high contrast observations from Y to L band at the Very Large Telescope Interferometer with the Asgard Instrumental suite

Marc-Antoine Martinod, Denis Defrère, Michael Ireland, Stefan Kraus, Frantz Martinache, Peter Tuthill, Azzurra Bigioli, Emilie Bouzerand, Julia Bryant, Sorabh Chhabra, Benjamin Courtney-Barrer, Fred Crous, Nick Cvetojevic, Colin Dandumont, Steve Ertel, Tyler Gardner, Germain Garreau, Adrian Glauser, Lucas Labadie, Tiphaine Lagadec, Romain Laugier, Alexandra Mazzoli, Daniel Mortimer, Barnaby R. Norris, Gert Raskin, Gordon Robertson, Ahmed Sanny, Adam Taras

JATIS, Vol. 9, Issue 02, 025007, (June 2023) https://doi.org/10.1117/12.10.1117/1.JATIS.9.2.025007

KEYWORDS: Equipment, Stars, L band, Exoplanets, Astronomical interferometers, Nulling interferometry, Imaging systems, Spatial resolution, Planets, Planetary systems

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SPIE Journal Paper | 18 April 2023

Photonic beam-combiner for visible interferometry with Subaru coronagraphic extreme adaptive optics/fibered imager for a single telescope: laboratory characterization and design optimization

Manon Lallement, Elsa Huby, Sylvestre Lacour, Guillermo Martin, Kevin Barjot, Guy Perrin, Daniel Rouan, Vincent Lapeyrere, Sebastien Vievard, Olivier Guyon, Julien Lozi, Vincent Deo, Takayuki Kotani, Cecil Pham, Cedric Cassagnettes, Adrien Billat, Nick Cvetojevic, Franck Marchis

JATIS, Vol. 9, Issue 02, 025003, (April 2023) https://doi.org/10.1117/12.10.1117/1.JATIS.9.2.025003

KEYWORDS: Waveguides, Photonic integrated circuits, Directional couplers, Design and modelling, Phase shifts, Interferometry, Beam combiners, Coronagraphy, Telescopes, Polarization

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Proceedings Article | 30 August 2022 Presentation + Paper

Presentation + Paper

Fizeau-interferometry fringe tracking solutions for giant segmented telescope petal modes

Frantz Martinache, Nick Cvetojevic, Vincent Deo

Proceedings Volume 12185, 121851A (2022) https://doi.org/10.1117/12.2630546

KEYWORDS: Telescopes, Adaptive optics, Wavefront sensors, Interferometry, Metrology, Diagnostics, K band, Visibility, Diffraction, Wavefronts

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Proceedings Article | 30 August 2022 Presentation + Paper

Presentation + Paper

Controlling petals using fringes: discontinuous wavefront sensing through sparse aperture interferometry at Subaru/SCExAO

V. Deo, S. Vievard, N. Cvetojevic, K. Ahn, E. Huby, O. Guyon, S. Lacour, J. Lozi, F. Martinache, B. Norris, N. Skaf, P. Tuthill

Proceedings Volume 12185, 121850Z (2022) https://doi.org/10.1117/12.2629865

KEYWORDS: Adaptive optics, Wavefront sensors, Telescopes, Astronomical interferometry

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Proceedings Article | 29 August 2022 Presentation + Paper

Presentation + Paper

Photonic chip for visible interferometry: laboratory characterization and comparison with the theoretical model

Manon Lallement, Sylvestre Lacour, Elsa Huby, Guillermo Martin, Kevin Barjot, Guy Perrin, Daniel Rouan, Vincent Lapeyrere, Sébastien Vievard, Olivier Guyon, Julien Lozi, Vincent Deo, Takayuki Kotani, Cecil Pham, Cedric Cassagnettes, Adrien Billat, Nick Cvetojevic, Franck Marchis

Proceedings Volume 12188, 121882F (2022) https://doi.org/10.1117/12.2629449

KEYWORDS: Waveguides, Directional couplers, Photonic integrated circuits, Polarization, Phase shifts, Telescopes, Interferometry, Optical simulations, Single mode fibers

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Proceedings Article | 29 August 2022 Poster + Paper

Poster + Paper

An all-photonic, dynamic device for flattening the spectrum of a laser frequency comb for precise calibration of radial velocity measurements

Nemanja Jovanovic, Pradip Gatkine, Boqiang Shen, Maodong Gao, Nick Cvetojevic, Katarzyna Ławniczuk, Ronald Broeke, Charles Beichman, Stephanie Leifer, Jeffrey Jewell, Gautam Vasisht, Dimitri Mawet

Proceedings Volume 12188, 121885D (2022) https://doi.org/10.1117/12.2630301

KEYWORDS: Waveguides, Frequency combs, Modulation, Calibration, Spectrographs, Precision calibration, Polarization, Velocity measurements, Light sources, Chemical elements

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Laser frequency combs are fast becoming critical to reaching the highest radial velocity precisions. One shortcoming is the highly variable brightness of the comb lines across the spectrum (up to 4-5 orders of magnitude). This can result in some lines saturating while others are at low signal and lost in the noise. Losing lines to either of these effects reduces the precision and hence effectiveness of the comb. In addition, the brightness of the comb lines can vary with time which could drive comb lines with initially reasonable SNR’s into the two regimes described above. To mitigate these two effects, laser frequency combs use optical flattener’s. Flattener’s are typically bulk optic setups that disperse the comb light with a grating, and then use a spatial light modulator to control the amplitude across the spectrum before recombining the light into another single mode fiber and sending it to the spectrograph. These setups can be large (small bench top), expensive (several hundred thousand dollars) and have limited stability. To address these issues, we have developed an all-photonic spectrum flattener on a chip. The device is constructed from optical waveguides on a SiN chip. The light from the laser frequency comb’s output optical fiber can be directly connected to the chip, where the light is first dispersed using an arrayed waveguide grating. To control the brightness of each channel, the light is passed through a Mach-Zehnder interferometer before being recombined with a second arrayed waveguide grating. Thermo-optic phase modulators are used in each channel before recombination to path length match the channels as needed. Here we present the results from our first generation prototype. The device operates from 1400-1800 nm (covering the H band), with 20, 20 nm wide channels. The device was mounted on a PCB board to enable electrical control of the active elements and tested in the laboratory. It was demonstrated that the Mach- Zehnder’s allowed for nearly 40 dBs of dynamic modulation of the spectrum, which is greater than that offered by most spatial light modulators. With a smooth spectrum light source (superluminescent light source), we reduced the spectral variation to 3 dBs, limited by the properties of the components used. On a laser frequency comb which had strong modulations at high spatial frequencies, we still managed to reduce the modulation to 5 dBs. These devices are of the order of a US quarter and could play a significant role in future PRV and EPRV initiatives.

Proceedings Article | 29 August 2022 Poster + Paper

Poster + Paper

Hybrid electro-optic visible multi-telescope beam combiner for next generation FIRST/SUBARU instruments

G. Martin, M. Foin, S. Phatak, M. Beldjoudi, A. Billat, C. Cassagnettes, A. Coste, N. Courjal, M. Lallement, K. Barjot, N. Cvetojevic, S. Vievard, E. Huby, S. Lacour, V. Deo, O. Guyon

Proceedings Volume 12188, 121885Y (2022) https://doi.org/10.1117/12.2630039

KEYWORDS: Modulation, Polarization, Electro optics, Waveguides, Lithium niobate, Phase modulation, Beam splitters, Glasses, Crystals, Telescopes

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Proceedings Article | 29 August 2022 Poster + Paper

Poster + Paper

FIRST 5T 3D: a laser written device for FIRST/SUBARU reducing crosstalk and propagation losses

G. Martin, A. Morand, C. d'Amico, R. Stoian, K. Barjot, M. Lallement, N. Cvetojevic, S. Vievard, E. Huby, S. Lacour, V. Deo, O. Guyon, J. Lv, G. Zhang, G. Cheng

Proceedings Volume 12188, 121882T (2022) https://doi.org/10.1117/12.2630010

KEYWORDS: Waveguides, Telescopes, Microelectromechanical systems, Laser optics, Interferometry, Modulation, Wave propagation, Visible radiation, Polarization, Optical simulations

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FIRST (Fibered Imager foR a Single Telescope instrument) is an instrument that enables high contrast imaging and spectroscopy, thanks to a unique combination of sparse aperture masking, spatial filtering by single-mode waveguides and cross-dispersion in the visible. In order to increase the instrument’s stability and sensitivity, we have designed and fabricated a 3D laser-written optical chip 5T beam combiner. The multi-aperture beam combiner consists of 5 input waveguides spaced by 250um. Each input is split into 4 waveguides. A pairwise recombination scheme with Yjunctions produces/leads to 10 outputs (127um separation, compatible with commercial V-grooves). In this work, we present the experimental characterization of the chip: transmission performance, polarization issues and single mode spectral range. The targeted single mode spectral range must cover 550-800nm. Different optical powers for laser writing are used to finely tune the ideal single-mode behavior of the waveguides, ranging from 220 to 270mW. A straight waveguide was used as a reference, imprinted close to the first interferometric channel. Using different lasers (635nm, 780nm and 980nm) as well as wideband sources, we have been able to characterize the spectral transmission, the polarization behavior (TE/TM) and the interferometric contrast. The chip was inserted in the FIRST/SUBARU optical bench simulator at LESIA, in order to inject the 5 inputs simultaneously and scan the fringes using 4 independent MEMS, inducing a relative OPD modulation. Preliminary results show very good transmission for such a complex chip: all input channels are above 45% at 635nm (comparing the injected single mode with the sum of the 4 corresponding outputs), with two inputs reaching 80%. A huge advantage of this technology is to avoid the crosstalk due to in-plane waveguide crossings, and we show that no crosstalk is indeed observed. Both polarizations are transmitted, without noticeable birefringence. However, perfect vertical alignment of the outputs is difficult to obtain, and must be optimized prior to any connectorization to fiber bundles.

Proceedings Article | 29 August 2022 Presentation

Presentation

Interferometric wavefront sensing at FIRST/SCExAO : self-calibrated fibered pupil-remapping spectrocopy using a metrology laser source

Sébastien Vievard, Vincent Deo, Elsa Huby, Sylvestre Lacour, Olivier Guyon, Nick Cvetojevic, Kevin Barjot, Guillermo Martin, Manon Lallement, Julien Lozi, Takayuki Kotani, Franck Marchis, Daniel Rouan, Kyohoon Ahn, Nour Skaf, Guy Perrin

Proceedings Volume 12183, 121830R (2022) https://doi.org/10.1117/12.2629299

KEYWORDS: Interferometry, Wavefront sensors, Telescopes, Metrology, Laser sources, Calibration, Spatial resolution, Optical fibers, Imaging systems, Coronagraphy

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Proceedings Article | 29 August 2022 Presentation

Presentation

First light of the upgraded FIRST visible fibered interferometer at the Subaru telescope (thesis)

Kevin Barjot, Elsa Huby, Sébastien Vievard, Manon Lallement, Sylvestre Lacour, Guillermo Martin, Nick Cvetojevic, Vincent Deo, Olivier Guyon, Julien Lozi, Takayuki Kotani, Cédric Cassagnettes, Adrien Billat, Franck Marchis, , Vincent Lapeyrère, Daniel Rouan

Proceedings Volume 12183, 121830E (2022) https://doi.org/10.1117/12.2630259

KEYWORDS: Telescopes, Visible radiation, Interferometers, Imaging spectroscopy, Stars, Waveguides, Visibility, Spectroscopy, Spectral resolution, Spatial resolution

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Proceedings Article | 29 August 2022 Presentation

Presentation

Closed-loop on-chip phase control and fringe tracking in photonic interferometers

Nick Cvetojevic, Frantz Martinache, Peter Chingaipe, Romain Laugier, Mamadou N'Diaye, Roxanne Ligi, David Mary

Proceedings Volume 12183, 1218318 (2022) https://doi.org/10.1117/12.2630002

KEYWORDS: Interferometers, Phase interferometry, Nulling interferometry, Waveguides, Telescopes, Adaptive optics, Actuators, Time metrology, Thermal optics, Servomechanisms

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Proceedings Article | 26 August 2022 Presentation + Paper

Presentation + Paper

Optimal self-calibration and fringe tracking in photonic nulling interferometers using machine learning

Barnaby R. Norris, Marc-Antoine Martinod, Peter Tuthill, Simon Gross, Nick Cvetojevic, Nemanja Jovanovic, Tiphaine Lagadec, Teresa Klinner-teo, Olivier Guyon, Julien Lozi, Vincent Deo, Sébastien Vievard, Alex Arriola, Thomas Gretzinger, Jon Lawrence, Michael Withford

Proceedings Volume 12183, 121831J (2022) https://doi.org/10.1117/12.2629873

KEYWORDS: Data modeling, Calibration, Wavefronts, Signal to noise ratio, Point spread functions, Nulling interferometry, Adaptive optics, Telescopes, Sensors, Machine learning

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Proceedings Article | 26 August 2022 Presentation + Paper

Presentation + Paper

STELLIM: a Stellar Imager at VLTI

Xavier Haubois, Nicolas Schuhler, Pierre Bourget, Julien Woillez, Nick Cvetojevic

Proceedings Volume 12183, 121831T (2022) https://doi.org/10.1117/12.2629240

KEYWORDS: Telescopes, Interferometry, Imaging systems, Image restoration, Optical instrument design, Optical fibers, Imaging arrays, Convection

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Proceedings Article | 26 August 2022 Presentation + Paper

Presentation + Paper

Achromatic nulling interferometry and fringe tracking with 3D-photonic tricouplers with GLINT

Marc-Antoine Martinod, Teresa Klinner-Teo, Peter Tuthill, Simon Gross, Elizabeth Arcadi, Glen Douglass, Jacinda Webb, Barnaby Norris, Olivier Guyon, Julien Lozi, Tiphaine Lagadec, Nemanja Jovanovic, Nick Cvetojevic, Alexander Arriola, Thomas Gretzinger, Michael Withford, Jon Lawrence, Sergio Leon-Saval

Proceedings Volume 12183, 121830K (2022) https://doi.org/10.1117/12.2627978

KEYWORDS: Nulling interferometry, Waveguides, Stars, Exoplanets, Phase shifts, Telescopes, Integrated optics, Interferometry, Adaptive optics, Wavefronts

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Proceedings Article | 26 August 2022 Presentation + Paper

Presentation + Paper

Statistical tests with multi-wavelength Kernel-phase analysis for the detection and characterization of planetary companions

Mamadou N'Diaye, David Mary, Frantz Martinache, Roxanne Ligi, Nick Cvetojevic, Peter Chingaipe, Romain Laugier

Proceedings Volume 12183, 121831M (2022) https://doi.org/10.1117/12.2629961

KEYWORDS: Stars, Statistical analysis, Sensors, Planets, Telescopes, Adaptive optics, Spectral resolution, Monte Carlo methods, Exoplanets

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Proceedings Article | 26 August 2022 Presentation + Paper

Presentation + Paper

High-angular and high-contrast VLTI observations from Y to M band with the Asgard instrumental suite

Marc-Antoine Martinod, Denis Defrère, Michael Ireland, Stefan Kraus, Frantz Martinache, Peter Tuthill, Azzurra Bigioli, Julia Bryant, Sorabh Chhabra, Benjamin Courtney-Barrer, Fred Crous, Nick Cvetojevic, Colin Dandumont, Germain Garreau, Tiphaine Lagadec, Romain Laugier, Daniel Mortimer, Barnaby Norris, Gordon Robertson, Adam Taras

Proceedings Volume 12183, 1218310 (2022) https://doi.org/10.1117/12.2628151

KEYWORDS: Sensors, Mirrors, Cameras, Lawrencium, Camera shutters, L band, Interferometers, Calibration, Spectral resolution, Spatial resolution

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Proceedings Article | 26 August 2022 Presentation + Paper

Presentation + Paper

Four-input photonic kernel-nulling for the VLTI

Peter Marley Chingaipe, Frantz Martinache, Nick Cvetojevic

Proceedings Volume 12183, 1218319 (2022) https://doi.org/10.1117/12.2630050

KEYWORDS: Nulling interferometry, Silicon photonics, Astronomical interferometry, Photonics, Long baseline optical interferometry

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Proceedings Article | 1 September 2021 Presentation + Paper

Presentation + Paper

Wavefront sensing using non-redundant aperture masking interferometry: tests and validation on Subaru/SCExAO

V. Deo, S. Vievard, N. Cvetojevic, B. Norris, O. Guyon, J. Lozi, K. Ahn, E. Huby, S. Lacour, F. Martinache, N. Skaf, P. Tuthill

Proceedings Volume 11823, 118231A (2021) https://doi.org/10.1117/12.2594977

KEYWORDS: Adaptive optics, Wavefront sensors, Telescopes, Sensors, Interferometry, Photons, Imaging systems, Cameras

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Proceedings Article | 1 September 2021 Presentation + Paper

Presentation + Paper

Very high resolution spectro-interferometry with wavefront sensing capabilities on Subaru/SCExAO using photonics

S. Vievard, K. Ahn, A. Arriola, K. Barjot, N. Cvetojevic, V. Deo, T. Gretzinger, S. Gross, O. Guyon, E. Huby, N. Jovanovic, T. Kotani, S. Lacour, T. Lagadec, M. Lallement, V. Lapeyrere, J. Lozi, F. Marchis, G. Martin, M.-A. Martinod, B. Norris, G. Perrin, D. Rouan, N. Skaf, P. Tuthill, M. Withford, G. Duchêne

Proceedings Volume 11823, 118230C (2021) https://doi.org/10.1117/12.2594840

KEYWORDS: Telescopes, Wavefront sensors, Single mode fibers, Stars, Optical fibers, Interferometry, Diffraction, Wavefronts, Spatial resolution, Photonics

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Proceedings Article | 14 December 2020 Presentation + Paper

Presentation + Paper

Starlight on a chip: astrophotonic technologies for interferometry

Nick Cvetojevic

Proceedings Volume 11446, 1144616 (2020) https://doi.org/10.1117/12.2562662

KEYWORDS: Interferometry, Astrophotonics, Interferometers, Telescopes, Waveguides, Nulling interferometry, Prototyping, Astronomical interferometry, Heart, Beam splitters

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Proceedings Article | 13 December 2020 Poster + Presentation + Paper

Poster + Presentation + Paper

Recent results on electro-optic visible multi-telescope beam combiner for next generation FIRST/SUBARU instruments: hybrid and passive devices

G. Martin, M. Foin, C. Cassagnettes, G. Ulliac, N. Courjal, K. Barjot, N. Cvetojevic, S. Vievard, V. Lapeyrere, E. Huby, S. Lacour

Proceedings Volume 11446, 1144626 (2020) https://doi.org/10.1117/12.2562171

KEYWORDS: Electro optics, 3D equipment, Visible radiation, Imaging spectroscopy, Beam splitters, Telescopes, Waveguides, Integrated optics, Glasses, Imaging systems

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Proceedings Article | 13 December 2020 Presentation + Paper

Presentation + Paper

Status of the SCExAO instrument: recent technology upgrades and path to a system-level demonstrator for PSI

Julien Lozi, Olivier Guyon, Sébastien Vievard, Ananya Sahoo, Vincent Deo, Nemanja Jovanovic, Barnaby Norris, Marc-Antoine Martinod, Ben Mazin, Alex Walter, Neelay Fruitwala, Sarah Steiger, Kristina Davis, Peter Tuthill, Tomoyuki Kudo, Hajime Kawahara, Takayuki Kotani, Michael Ireland, Theodoros Anagnos, Chrstian Schwab, Nick Cvetojevic, Elsa Huby, Sylvestre Lacour, Kevin Barjot, Tyler Groff, Jeffrey Chilcote, Jeremy Kasdin, Frantz Martinache, Romain Laugier, Mamadou N'Diaye, Justin Knight, Jared Males, Steven Bos, Frans Snik, David Doelman, Kelsey Miller, Eduardo Bendek, Ruslan Belikov, Eugene Pluzhnik, Thayne Currie, Masayuki Kuzuhara, Taichi Uyama, Jun Nishikawa, Naoshi Murakami, Jun Hashimoto, Yosuke Minowa, Christophe Clergeon, Yoshito Ono, Naruhisa Takato, Motohide Tamura, Hideki Takami, Masa Hayashi

Proceedings Volume 11448, 114480N (2020) https://doi.org/10.1117/12.2562832

KEYWORDS: Imaging systems, Telescopes, Infrared sensors, Infrared imaging, Coronagraphy, Wavefront sensors, Sensors, Detection and tracking algorithms, Cameras, Wavefronts

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Proceedings Article | 13 December 2020 Poster + Paper

Poster + Paper

FIRST, a pupil-remapping fiber interferometer at the Subaru Telescope: on-sky results

S. Vievard, E. Huby, S. Lacour, K. Barjot, G. Martin, N. Cvetojevic, V. Deo, O. Guyon, J. Lozi, T. Kotani, N. Jovanovic, F. Marchis, G. Duchêne, V. Lapeyrere, D. Rouan, G. Perrin

Proceedings Volume 11446, 1144629 (2020) https://doi.org/10.1117/12.2563033

KEYWORDS: Telescopes, Adaptive optics, Interferometers, Imaging systems, Single mode fibers, Interferometry, Spatial filters, Optical instrument design, Diffraction, Speckle

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Proceedings Article | 13 December 2020 Presentation

Presentation

The first multi-baseline and multi-band, photonic nuller at the Subaru telescope: the GLINT nulling interferometer

Marc-Antoine Martinod, Barnaby Norris, Tiphaine Lagadec, Nemanja Jovanovic, Nick Cvetojevic, Simon Gross, Alexander Arriola, Thomas Gretzinger, Michael Withford, Olivier Guyon, Julien Lozi, Jon Lawrence, Peter Tuthill, Sergio Leon-Saval

Proceedings Volume 11446, 114460G (2020) https://doi.org/10.1117/12.2560857

KEYWORDS: Nulling interferometry, Telescopes, Interferometers, Exoplanets, Atmospheric optics, Adaptive optics, Optical instrument design, Spatial resolution, Destructive interference, Prototyping

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Proceedings Article | 13 December 2020 Poster + Paper

Poster + Paper

Laboratory characterization of FIRSTv2 photonic chip for the study of substellar companions

K. Barjot, E. Huby, S. Vievard, N. Cvetojevic, S. Lacour, G. Martin, V. Deo, V. Lapeyrere, D. Rouan, O. Guyon, J. Lozi, N. Jovanovic, C. Cassagnettes, G. Perrin, F. Marchis, G. Duchêne, T. Kotani

Proceedings Volume 11446, 1144623 (2020) https://doi.org/10.1117/12.2561713

KEYWORDS: Telescopes, Imaging spectroscopy, Single mode fibers, Visible radiation, Interferometry, Microelectromechanical systems, Fiber characterization, Imaging systems, Spectroscopes, Diffraction

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Proceedings Article | 13 December 2020 Poster + Presentation + Paper

Poster + Presentation + Paper

Active phase change for a kernel nulling interferometer

Harry-Dean Kenchington Goldsmith, Michael Ireland, Frantz Martinache, Nick Cvetojevic, Stephen Madden

Proceedings Volume 11446, 114462V (2020) https://doi.org/10.1117/12.2562894

KEYWORDS: Waveguides, Nulling interferometry, Exoplanets, Chalcogenides, Stars, Phase interferometry, Brain-machine interfaces, Imaging systems, Interferometers, Lead

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Proceedings Article | 13 December 2020 Presentation + Paper

Presentation + Paper

Reconciling kernel-phase and coronagraphy: new steps towards combining the performance of opposing techniques

Romain Laugier, Frantz Martinache, Mamadou N'Diaye, Nick Cvetojevic

Proceedings Volume 11446, 114461Q (2020) https://doi.org/10.1117/12.2562303

KEYWORDS: Coronagraphy, Stars, Wavefronts, Spatial resolution, Feature extraction, Diffraction, Image analysis, Fourier transforms, Telescopes, Apodization

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Proceedings Article | 2 March 2020 Presentation + Paper

Presentation + Paper

Status and future developments of integrated photonic spectrographs for astronomy and Earth and planetary sciences

N. Jovanovic, N. Cvetojevic, M. Daal, B. Mazin, R. Moreira, D. Mawet, G. Vasisht, C. Beichman, K. Wallace, J. Jewell, S. Leifer, R. Dekany, M. Porter

Proceedings Volume 11287, 112870K (2020) https://doi.org/10.1117/12.2546959

KEYWORDS: Spectrographs, Astronomy, Telescopes, Waveguides, Single mode fibers, Spectral resolution, Sensors, Integrated photonics, Planetary science, Photonic devices

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Proceedings Article | 3 January 2020 Paper

Paper

Diffraction-limited polarimetric imaging of protoplanetary disks and mass-loss shells with VAMPIRES

Barnaby R. Norris, Peter Tuthill, Nemanja Jovanovic, Julien Lozi, Olivier Guyon, Nick Cvetojevic, Frantz Martinache

Proceedings Volume 11203, 112030S (2020) https://doi.org/10.1117/12.2539998

KEYWORDS: Polarimetry, Astronomy, Telescopes, Stars, Interferometry, Calibration, Imaging systems, Coronagraphy, Polarization, Observatories

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Proceedings Article | 13 July 2018 Paper

Paper

SCExAO, an instrument with a dual purpose: perform cutting-edge science and develop new technologies

Julien Lozi, Olivier Guyon, Nemanja Jovanovic, Sean Goebel, Prashant Pathak, Nour Skaf, Ananya Sahoo, Barnaby Norris, Frantz Martinache, Mamadou N'Diaye, Ben Mazin, Alex Walter, Peter Tuthill, Tomoyuki Kudo, Hajime Kawahara, Takayuki Kotani, Michael Ireland, Nick Cvetojevic, Elsa Huby, Sylvestre Lacour, Sébastien Vievard, Tyler Groff, Jeffrey Chilcote, Jeremy Kasdin, Justin Knight, Frans Snik, David Doelman, Yosuke Minowa, Christophe Clergeon, Naruhisa Takato, Motohide Tamura, Thayne Currie, Hideki Takami, Masa Hayashi

Proceedings Volume 10703, 1070359 (2018) https://doi.org/10.1117/12.2314282

KEYWORDS: Cameras, Coronagraphy, Polarization, Near infrared, Speckle, Exoplanets, Wavefronts, Telescopes, Infrared radiation, Polarimetry

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Proceedings Article | 10 July 2018 Presentation + Paper

Presentation + Paper

Review of high-contrast imaging systems for current and future ground-based and space-based telescopes III: technology opportunities and pathways

Frans Snik, Olivier Absil, Pierre Baudoz, Mathilde Beaulieu, Eduardo Bendek, Eric Cady, Brunella Carlomagno, Alexis Carlotti, Nick Cvetojevic, David Doelman, Kevin Fogarty, Raphaël Galicher, Olivier Guyon, Sebastiaan Haffert, Elsa Huby, Jeffrey Jewell, Nemanja Jovanovic, Christoph Keller, Matthew Kenworthy, Justin Knight, Jonas Kuhn, Johan Mazoyer, Kelsey Miller, Mamadou N'Diaye, Barnaby Norris, Emiel Por, Laurent Pueyo, A. J. Eldorado Riggs, Garreth Ruane, Dan Sirbu, J. Kent Wallace, Michael Wilby, Marie Ygouf

Proceedings Volume 10706, 107062L (2018) https://doi.org/10.1117/12.2313957

KEYWORDS: Coronagraphy, Space telescopes, Imaging systems, Exoplanets, Telescopes, Point spread functions, Liquid crystals, Adaptive optics, Wavefront sensors

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Proceedings Article | 10 July 2018 Presentation

Presentation

FIRST, the pupil-remapping fiber interferometer at Subaru telescope: towards photonic beam-combination with phase control and on-sky commissioning results (Conference Presentation)

Nick Cvetojevic, Elsa Huby, Guillermo Martin, Sylvestre Lacour, Franck Marchis, Julien Lozi, Nemanja Jovanovic, Sébastien Vievard, Olivier Guyon, Lucien Gauchet, Guy Perrin, Gaspard Duchêne, Takayuki Kotani

Proceedings Volume 10701, 107010A (2018) https://doi.org/10.1117/12.2313262

KEYWORDS: Telescopes, Interferometers, Beam controllers, Imaging spectroscopy, Spatial filters, Interferometry, Binary data, Photonic crystals, Imaging systems, Spectroscopes

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FIRST (Fibered Imager foR a Single Telescope) is a post-AO instrument module that enables high-contrast imaging and spectroscopy at sub-diffraction limited spatial scales. FIRST achieves this through a unique combination of sparse aperture masking, spatial filtering, pupil remapping Fizeau interferometry, and cross-dispersion in the visible. The telescope pupil is divided into sub-pupils using a honeycomb array of micro-electro-mechanical mirrors, and the light from each sub-pupil injected into a separate single mode fiber that provides spatial filtering. The fibers, which are pathlength-matched to within a few tens of micrometers, reformat the sub-apertures into a linear non-redundant array allowing for the extraction of fringes from each possible baseline as well as wavelength dispersion to create ~130 spectral channels for every baseline combination over the 600-900nm spectral range. In this presentation, we will first report on the latest on-sky results obtained with FIRST. In its current design, the instrument was successfully integrated on the 3-m telescope at Lick Observatory and is now a module of the SCExAO extreme adaptive optics instrument on the 8-m Subaru Telescope. The latest on-sky results obtained from commissioning data show the detection of the stellar companion of the Alpha Equu binary system at an angular separation of 0.6 λ/D (11mas). Even at such a separation, the FIRST data delivers information on the companion spectrum, providing valuable constraints on the stellar parameters of the system such as the effective temperatures. The second part of this presentation will focus on the ongoing instrument upgrades with the aim of increasing the instrument’s stability and sensitivity, thus improving the dynamic range. We initiated a comprehensive upgrade of FIRST’s interferometric components to a new series of photonic on-chip beam combiners and automated optoelectronic delay lines for rapid phasing of each sub-pupil. The new photonic beam combining chips split light from each sub-aperture and combines them to provide a simultaneous measurement of the fringes from every baseline. Another function of the new photonic chips is the inclusion of waveguides in crystalline electro-optic material (Lithium niobate) that enable on-chip active phase control of the light at high speeds (up to kHz). This type of photonic architecture has not been implemented previously for astronomical interferometry of this kind and could potentially provide FIRST with key advantages (see Martin et al., these proceedings). While the beam-combiner output no longer requires non-redundancy, the fiber array that feeds the chip input still requires accurate pathlength-matching to achieve high fringe contrasts. The existing fibers were individually manufactured to ensure identical length. However, while this method was successful, it was not very flexible particularly if any photonic components are added that change the overall fiber length. Thus, another key FIRST upgrade is the use of actively controlled fiber delay lines capable of compensating for up to 100 mm of differential pathlength in each fiber, with sub-micron accuracy. This type of active pathlength control allows FIRST to not only correct for unwanted environmental phase delays, but also makes it entirely reconfigurable regardless of the back-end photonics used.

Proceedings Article | 9 July 2018 Paper

Paper

First results on an electro-optic visible multi-telescope beam combiner for next generation FIRST/SUBARU instruments

G. Martin, F. Gardillou, C. Cassagnettes, D. Barbier, C. Guyot, J. Hauden, G. Ulliac, N. Courjal, N. Cvetojevic, E. Huby, S. Lacour

Proceedings Volume 10701, 107012V (2018) https://doi.org/10.1117/12.2312841

KEYWORDS: Waveguides, Glasses, Modulators, Electro optics, Lithium niobate, Phase modulation, Modulation, Prototyping, Optical fibers, Phase shift keying

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Proceedings Article | 9 July 2018 Presentation + Paper

Presentation + Paper

GLINT South: a photonic nulling interferometer pathfinder at the Anglo-Australian Telescope for high contrast imaging of substellar companions

Tiphaine Lagadec, Barnaby Norris, Simon Gross, Alexander Arriola, Thomas Gretzinger, Nick Cvetojevic, Jon Lawrence, Michael Withford, Peter Tuthill

Proceedings Volume 10701, 107010V (2018) https://doi.org/10.1117/12.2313171

KEYWORDS: Stars, Waveguides, Telescopes, Nulling interferometry, Segmented mirrors, Planets, Astronomy, Mirrors, Adaptive optics, Glasses

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Proceedings Article | 9 August 2016 Paper

Paper

Efficient coupling of starlight into single mode photonics using Adaptive Injection (AI)

Barnaby Norris, Nick Cvetojevic, Simon Gross, Alexander Arriola, Peter Tuthill, Jon Lawrence, Samuel Richards, Michael Goodwin, Jessica Zheng

Proceedings Volume 9908, 99085E (2016) https://doi.org/10.1117/12.2233757

KEYWORDS: Adaptive optics, Artificial intelligence, Waveguides, Telescopes, Wavefronts, Microelectromechanical systems, Photonics, Mirrors, Wavefront sensors, Deformable mirrors

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Proceedings Article | 4 August 2016 Paper

Paper

Astronomical photonics in the context of infrared interferometry and high-resolution spectroscopy

Lucas Labadie, Jean-Philippe Berger, Nick Cvetojevic, Roger Haynes, Robert Harris, Nemanja Jovanovic, Sylvestre Lacour, Guillermo Martin, Stefano Minardi, Guy Perrin, Martin Roth, Robert Thomson

Proceedings Volume 9907, 990718 (2016) https://doi.org/10.1117/12.2230889

KEYWORDS: Astrophotonics, Interferometry, Photonics, Astronomy, Waveguides, Glasses, Dispersion, Mid-IR, Integrated optics, Wave propagation

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Proceedings Article | 4 August 2016 Paper

Paper

Chalcogenide glass planar MIR couplers for future chip based Bracewell interferometers

H.-D. Kenchington Goldsmith, N. Cvetojevic, M. Ireland, P. Ma, P. Tuthill, B. Eggleton, J. Lawrence, S. Debbarma, B. Luther-Davies, S. Madden

Proceedings Volume 9907, 990730 (2016) https://doi.org/10.1117/12.2232199

KEYWORDS: Photonics, Chalcogenide glass, Exoplanets, Interferometers, Interferometry, Astronomy, Exoplanets, Stars, Waveguides, Brain-machine interfaces, Space telescopes

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Proceedings Article | 3 August 2016 Paper

Paper

Efficiently feeding single-mode fiber photonic spectrographs with an extreme adaptive optics system: on-sky characterization and preliminary spectroscopy

N. Jovanovic, N. Cvetojevic, C. Schwab, B. Norris, J. Lozi, S. Gross, C. Betters, G. Singh, O. Guyon, F. Martinache, D. Doughty, P. Tuthill

Proceedings Volume 9908, 99080R (2016) https://doi.org/10.1117/12.2234299

KEYWORDS: Spectrographs, Adaptive optics, Single mode fibers, Apodization, Wavefronts, Telescopes, Calibration, Cameras, Point spread functions, Imaging spectroscopy

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Proceedings Article | 27 July 2016 Paper

Paper

Adaptive optics on-sky demonstrator for the Anglo-Australian Telescope

Michael Goodwin, Jessica Zheng, Jon Lawrence, Samuel Richards, Alexander Arriola, Nick Cvetojevic, Simon Gross, Barnaby Norris

Proceedings Volume 9909, 990933 (2016) https://doi.org/10.1117/12.2232241

KEYWORDS: Adaptive optics, Telescopes, Observatories, Astronomy, Optical testing, Stars, Wavefront sensors, Adaptive optics, Cameras, Point spread functions, Wavefronts

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Proceedings Article | 26 July 2016 Paper

Paper

The SCExAO high contrast imager: transitioning from commissioning to science

N. Jovanovic, O. Guyon, J. Lozi, T. Currie, J. Hagelberg, B. Norris, G. Singh, P. Pathak, D. Doughty, S. Goebel, J. Males, J. Kuhn, E. Serabyn, P. Tuthill, G. Schworer, F. Martinache, T. Kudo, H. Kawahara, T. Kotani, M. Ireland, T. Feger, A. Rains, J. Bento, C. Schwab, D. Coutts, N. Cvetojevic, S. Gross, A. Arriola, T. Lagadec, J. Kasdin, T. Groff, B. Mazin, Y. Minowa, N. Takato, M. Tamura, H. Takami, M. Hayashi

Proceedings Volume 9909, 99090W (2016) https://doi.org/10.1117/12.2234294

KEYWORDS: Adaptive optics, Imaging systems, Stars, Telescopes, Calibration, Visible radiation, Spectrographs, Speckle, Cameras, Prisms

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Proceedings Article | 22 July 2016 Paper

Paper

Adaptive optics fed single-mode spectrograph for high-precision Doppler measurements in the near-infrared

C. Schwab, N. Jovanovic, T. Feger, M. Bakovic, Y. Gurevich, J. Stürmer, R. Apodaca, L. Vanzi, S. Rukdee, J. Lawrence, D. Coutts, N. Cvetojevic, S. Mahadevan, G. Stefánsson, S. Halverson, O. Guyon

Proceedings Volume 9912, 991274 (2016) https://doi.org/10.1117/12.2234407

KEYWORDS: Spectrographs, Adaptive optics, Doppler effect, Optical design, Spectrographs, Single mode fibers, Cameras, Mirrors, Telescopes, Point spread functions, Sensors

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Proceedings Article | 28 August 2014 Paper

Paper

Fizeau interferometric cophasing of segmented mirrors

Anthony Cheetham, Nick Cvetojevic, Anand Sivaramakrishnan, Barnaby Norris, Peter Tuthill

Proceedings Volume 9143, 914352 (2014) https://doi.org/10.1117/12.2057080

KEYWORDS: Mirrors, James Webb Space Telescope, Image segmentation, Segmented mirrors, Telescopes, Space telescopes, Point spread functions, Interferometry, Wavefronts, Numerical simulations

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Proceedings Article | 7 August 2014 Paper

Paper

Core-to-core uniformity improvement in multi-core fiber Bragg gratings

Emma Lindley, Seong-Sik Min, Sergio Leon-Saval, Nick Cvetojevic, Nemanja Jovanovic, Joss Bland-Hawthorn, Jon Lawrence, Itandehui Gris-Sanchez, Tim Birks, Roger Haynes, Dionne Haynes

Proceedings Volume 9151, 91515F (2014) https://doi.org/10.1117/12.2055623

KEYWORDS: Capillaries, Cladding, Fiber Bragg gratings, Polishing, Refractive index, Single mode fibers, Ultraviolet radiation, Silica, Astronomy, Optical simulations

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Proceedings Article | 28 July 2014 Paper

Paper

Interferometers and spectrographs on silicon-platform for astrophysics: trends of astrophotonics

Harendra N. Fernando, Andreas Stoll, Nick Cvetojevic, René Eisemann, Nuwan Tharanga, Christopher Holmes, Michael Böhm, Martin Roth, Roger Haynes, Lars Zimmermann

Proceedings Volume 9151, 915148 (2014) https://doi.org/10.1117/12.2056500

KEYWORDS: Waveguides, Silicon, Birefringence, Interferometers, Spectrographs, Astronomy, Computer aided design, Spectral resolution, Photonics, Integrated photonics

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Proceedings Article | 24 July 2014 Paper

Paper

High performance 3D waveguide architecture for astronomical pupil-remapping interferometry

Simon Gross, Barnaby Norris, Nick Cvetojevic, Nemanja Jovanovic, Alexander Arriola Martiarena, Paul Stewart, Jon Lawrence, Michael Withford, Peter Tuthill

Proceedings Volume 9146, 91461B (2014) https://doi.org/10.1117/12.2057282

KEYWORDS: Waveguides, Planets, Astronomy, Photonics, Interferometry, Glasses, Stars, Microelectromechanical systems, Single mode fibers, Adaptive optics

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Proceedings Article | 24 July 2014 Paper

Paper

How to inject light efficiently into single-mode fibers

Nemanja Jovanovic, Olivier Guyon, Frantz Martinache, Christian Schwab, Nick Cvetojevic

Proceedings Volume 9147, 91477P (2014) https://doi.org/10.1117/12.2057210

KEYWORDS: Single mode fibers, Wavefronts, Point spread functions, Adaptive optics, Apodization, Spectrographs, Stars, Wavefront sensors, Lenses, Planets

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Proceedings Article | 24 September 2012 Paper

Paper

Redesign of the integrated photonic spectrograph for improved astronomical performance

Nick Cvetojevic, Nemanja Jovanovic, Jon Lawrence, Michael Withford, Joss Bland-Hawthorn

Proceedings Volume 8446, 84463I (2012) https://doi.org/10.1117/12.925787

KEYWORDS: Waveguides, Spectrographs, Astronomy, Spectral resolution, Photonics, Prototyping, Integrated photonics, Semiconducting wafers, Optical design, Single mode fibers

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Proceedings Article | 23 July 2010 Paper

Paper

Fibre Bragg gratings for temporal spectral astronomy

Geraldine Mariën, Nick Cvetojevic, Nemanja Jovanovic, Judith Dawes, Joss Bland-Hawthorn, Roger Haynes, Jon Lawrence, Quentin Parker, Michael Withford

Proceedings Volume 7739, 77392C (2010) https://doi.org/10.1117/12.856784

KEYWORDS: Fiber Bragg gratings, Astronomy, Optical filters, Reflectivity, Stars, Spectral resolution, Telescopes, Optical fibers, Single mode fibers, Signal to noise ratio

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Proceedings Article | 20 July 2010 Paper

Paper

Miniature spectrographs: characterization of arrayed waveguide gratings for astronomy

Nick Cvetojevic, Nemanja Jovanovic, Joss Bland-Hawthorn, Roger Haynes, Jon Lawrence

Proceedings Volume 7739, 77394H (2010) https://doi.org/10.1117/12.856782

KEYWORDS: Spectrographs, Astronomy, Waveguides, Prototyping, Integrated photonics, Telescopes, Multiplexers, Telecommunications, Cameras, Spectral resolution

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Proceedings Article | 20 July 2010 Paper

Paper

Miniature astronomical spectrographs using arrayed-waveguide gratings: capabilities and limitations

Jon Lawrence, Joss Bland-Hawthorn, Nick Cvetojevic, Roger Haynes, Nemanja Jovanovic

Proceedings Volume 7739, 77394I (2010) https://doi.org/10.1117/12.856786

KEYWORDS: Waveguides, Spectrographs, Diffraction, Astronomy, Prototyping, Spectral resolution, Dispersion, Multiplexing, Wave propagation, V band

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Proceedings Article | 15 July 2010 Paper

Paper

PIMMS: photonic integrated multimode microspectrograph

Joss Bland-Hawthorn, Jon Lawrence, Gordon Robertson, Sam Campbell, Ben Pope, Chris Betters, Sergio Leon-Saval, Tim Birks, Roger Haynes, Nick Cvetojevic, Nem Jovanovic

Proceedings Volume 7735, 77350N (2010) https://doi.org/10.1117/12.856347

KEYWORDS: Spectrographs, Waveguides, Single mode fibers, Sensors, Telescopes, Spectroscopes, Electrons, Photonic devices, Diffraction, Spectral resolution

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Showing 5 of 60 publications

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