Dr. Sorabh Chhabra Profile

Dr. Sorabh Chhabra

Postdoctoral fellow at Univ of Exeter

SPIE Involvement:

Author

Publications (19)

Proceedings Article | 28 August 2024 Poster + Paper

Vanaheim: a dual-field calibration unit for the integration and testing of the BIFROST instrument

D. Lancaster, S. Chhabra, J. Paul, S. Kraus, A. Taras, M. Ireland

Proceedings Volume 13095, 1309522 (2024) https://doi.org/10.1117/12.3019783

KEYWORDS: Equipment, Calibration, Design, Beam splitters, Off axis mirrors, Mirrors

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Proceedings Article | 28 August 2024 Poster + Paper

The Asgard/BIFROST pre-injection optics and fiber injection module: optomechanical design and lab results

Jyotirmay Paul, Daniel Mortimer, Sorabh Chhabra, Daniel Lancaster, Owain Snaith, Sidney Skellett, Arthur Kitching, Stefan Kraus, John Monnier, Michael Ireland

Proceedings Volume 13095, 1309521 (2024) https://doi.org/10.1117/12.3018779

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Proceedings Article | 28 August 2024 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 Poster + Paper

Recent and upcoming upgrades for MIRC-X and MYSTIC on the CHARA Array

Noura Ibrahim, Mayra Gutierrez, John Monnier, Stefan Kraus, Jean-Baptiste Le Bouquin, Narsireddy Anugu, Theo ten Brummelaar, Sorabh Chhabra, Isabelle Codron, Julien Dejonghe, Aaron Labdon, Daniel Lecron, Daniel Mortimer, Denis Mourard, Gail Schaefer, Benjamin Setterholm, Manuela Arnó, Andrea Bianco, Michele Frangiamore, laurent Jocou

Proceedings Volume 13095, 130951W (2024) https://doi.org/10.1117/12.3018413

KEYWORDS: Tunable filters, Equipment, Optical filters, Computer aided design, Beam combiners, Cameras, Switching, Mirrors, Bandpass filters, Telescopes

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Proceedings Article | 28 August 2024 Poster + Paper

Spectrographs for the Asgard/BIFROST beam combiner for the VLTI: optical and optomechanical design and first lab results

Sorabh Chhabra, Stefan Kraus, Michele Frangiamore, Andrea Bianco, Andrea Vanella, Michael Ireland, Francisco Garzon, Manuela Arno, Daniel Lancaster, Daniel Mortimer, John Monnier, Jyotirmay Paul, Gordon Robertson, Owain Snaith

Proceedings Volume 13095, 130952D (2024) https://doi.org/10.1117/12.3018851

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Proceedings Article | 28 August 2024 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 Poster + Paper

The on- and off-axis light injection module for Asgard/BIFROST at VLTI

Daniel Mortimer, Sorabh Chhabra, Michael Ireland, Paul Jyotirmay, Stefan Kraus, Owain Snaith

Proceedings Volume 13095, 1309526 (2024) https://doi.org/10.1117/12.3019671

KEYWORDS: Tolerancing, Design, Optical path differences, Fiber couplers, Point spread functions, Beam diameter, Zemax, Dichroic mirrors

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Proceedings Article | 28 August 2024 Presentation + Paper

Precision interferometry with MIRC-X/MYSTIC for exoplanets

John Monnier, Tyler Gardner, Linling Shuai, Emily Rauscher, Hayley Beltz, Isaac Malsky, Jean-Baptiste le Bouquin, Gail Schaefer, Stefan Kraus, Benjamin Setterholm, Narsireddy Anugu, Theo ten Brummelaar, Sorabh Chhabra, Isabelle Codron, Claire Davies, Jacob Ennis, Mayra Gutierrez, Noura Ibrahim, Aaron Labdon, Cyprien Lanthermann, Daniel Mortimer

Proceedings Volume 13095, 1309516 (2024) https://doi.org/10.1117/12.3020765

KEYWORDS: Exoplanets, Planets, Stars, Jupiter, Phase measurement, Binary stars, Interferometry, Data modeling, Visibility, Telescopes

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Proceedings Article | 28 August 2024 Presentation

Status of Asgard/BIFROST: short-wavelength, high-spectral dispersion interferometry at VLTI

Stefan Kraus, Sorabh Chhabra, Jyotirmay Paul, Owain Snaith, Daniel Lancaster, Daniel Mortimer, Narsireddy Anugu, Michael Ireland, Frantz Martinache, Denis Defrère, Xavier Haubois, Nicolas Schuhler, Antoine Merand, Andrea Bianco, Michele Frangiamore, John Monnier, Marc-Antoine Martinod, Joshua Carter, Isabelle Codron, Yi Lu, Tyler Gardner

Proceedings Volume 13095, 130950E (2024) https://doi.org/10.1117/12.3019876

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Proceedings Article | 26 August 2024 Poster + Paper

VPHG-based GRISMs for MIRC-X/MYSTIC at CHARA

Michele Frangiamore, Andrea Bianco, Sorabh Chhabra, Stefan Kraus, John Monnier

Proceedings Volume 13100, 131005G (2024) https://doi.org/10.1117/12.3021127

KEYWORDS: Diffraction, K band, Diffraction gratings, Astronomy, Prisms, Equipment, Manufacturing, Spectrographs, Holography, Design

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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 | 6 June 2023 Open Access

MYSTIC: a high angular resolution K-band imager at CHARA

Benjamin Setterholm, John Monnier, Jean-Baptiste Le Bouquin, Narsireddy Anugu, Jacob Ennis, Laurent Jocou, Nour Ibrahim, Stefan Kraus, Matthew Anderson, Sorabh Chhabra, Isabelle Codron, Christopher Farrington, Becky Flores, Tyler Gardner, Mayra Gutierrez, Cyprien Lanthermann, Olli W. Majoinen, Daniel Mortimer, Gail Schaefer, Nicholas Scott, Theo ten Brummelaar, Norman Vargas

JATIS, Vol. 9, Issue 02, 025006, (June 2023) https://doi.org/10.1117/12.10.1117/1.JATIS.9.2.025006

KEYWORDS: Equipment, K band, Spatial resolution, Beam combiners, Cameras, Imaging systems, Prisms, Mirrors, Vacuum, Design and modelling

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Proceedings Article | 30 August 2022 Poster + Paper

Speckle simulation tool for automated modelling of a large range of telescope aperture to fried parameter ratios

Sorabh Chhabra, Abhay Kohok, Bhushan Joshi, A. Ramaprakash, Chaitanya Rajarshi, Rani Bhandare

Proceedings Volume 12185, 1218566 (2022) https://doi.org/10.1117/12.2628032

KEYWORDS: Turbulence, Telescopes, Speckle, Device simulation, Lenses, Zemax, Collimation, Cameras, Atmospheric turbulence, Monte Carlo methods

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Proceedings Article | 26 August 2022 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

Beam combiner for the Asgard/BIFROST instrument

Daniel Mortimer, Sorabh Chhabra, Stefan Kraus, Narsireddy Anugu, Romain Laugier, Jean-Baptiste Le Bouquin, John Monnier

Proceedings Volume 12183, 121831U (2022) https://doi.org/10.1117/12.2629268

KEYWORDS: Signal to noise ratio, Single mode fibers, Visibility, Photons, Spatial frequencies, Spectral resolution

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Proceedings Article | 26 August 2022 Presentation + Paper

Spectrograph design for the Asgard/BIFROST spectro-interferometric instrument for the VLTI

Sorabh Chhabra, Michele Frangiamore, Stefan Kraus, Andrea Bianco, Francisco Garzon, John Monnier, Daniel Mortimer

Proceedings Volume 12183, 121830M (2022) https://doi.org/10.1117/12.2628805

KEYWORDS: Spectrographs, Binary data, Diffraction gratings, Calibration, Sensors, Prisms, Spectral resolution, Diffraction, Reflectivity

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Proceedings Article | 26 August 2022 Presentation + Paper

High spectral-resolution interferometry down to one micron with Asgard/BIFROST at VLTI: science drivers and project overview

Stefan Kraus, Daniel Mortimer, Sorabh Chhabra, Yi Lu, Isabelle Codron, Tyler Gardner, Narsireddy Anugu, John Monnier, Jean-Baptiste Le Bouquin, Michael Ireland, Frantz Martinache, Denis Defrère, Marc-Antoine Martinod

Proceedings Volume 12183, 121831S (2022) https://doi.org/10.1117/12.2627973

KEYWORDS: Stars, Spectral resolution, Interferometry, Exoplanets, Astronomical interferometry, Infrared detectors, Astronomical spectroscopy

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SPIE Journal Paper | 17 June 2021 Open Access

Generalized approach to compensate for low- and high-frequency errors in fast Fourier transform-based phase screen simulations

Sorabh Chhabra, Jyotirmay Paul, Anamparambu Ramaprakash, Avinash Surendran

JATIS, Vol. 7, Issue 02, 025007, (June 2021) https://doi.org/10.1117/12.10.1117/1.JATIS.7.2.025007

KEYWORDS: MATLAB, Fourier transforms, Telescopes, Matrices, Device simulation, Atmospheric turbulence, Atmospheric propagation, Astrophysics, Astronomy, Zernike polynomials

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