Prof. Ian A. Walmsley Profile

Prof. Ian A. Walmsley

at Imperial College London

SPIE Involvement:

Author

Publications (16)

Proceedings Article | 3 March 2022 Presentation + Paper

Presentation + Paper

Brillouin optomechanics: from strong coupling to single-phonon-level operations

Georg Enzian, Lars Freisem, John Price, Andreas Svela, Jack Clarke, Magdalena Szczykulska, Joshua Nunn, Ian Walmsley, Jonathan Silver, Leonardo Del Bino, Shuangyou Zhang, Pascal Del'Haye, Biveen Shajilal, Jiri Janousek, Ben Buchler, Ping Koy Lam, Michael Vanner

Proceedings Volume 12016, 120160E (2022) https://doi.org/10.1117/12.2616725

KEYWORDS: Tomography, Signal detection, Heterodyning, Scattering, Physics, Microresonators, Quantum physics, Quantum optics

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Proceedings Article | 13 July 2021 Presentation

Presentation

Photonic quantum technologies

Ian Walmsley

Proceedings Volume 11844, 118440F (2021) https://doi.org/10.1117/12.2603525

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Proceedings Article | 5 March 2021 Presentation

Presentation

Brillouin optomechanics in whispering-gallery-mode microresonators: from strong coupling to single-phonon addition and subtraction

Georg Enzian, John Price, Lars Freisem, Magdalena Szczykulska, Joshua Nunn, Ian Walmsley, Jonathan Silver, Leonardo Del Bino, Shuangyou Zhang, Pascal Del'Haye, Jiri Janousek, Ben Buchler, Ping Koy Lam, Michael Vanner

Proceedings Volume 11700, 117001M (2021) https://doi.org/10.1117/12.2588453

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Proceedings Article | 4 March 2019 Presentation

Presentation

Modular linear optical circuits for quantum information processing (Conference Presentation)

James Gates, Paolo Mennea, William Clements, Devin Smith, Rex H. Bannerman, Jelmer Renema, William Kolthammer, Ian Walmsley, Peter G. Smith

Proceedings Volume 10933, 109330A (2019) https://doi.org/10.1117/12.2510301

KEYWORDS: Quantum information processing, Optical circuits, Integrated optics, Phase shifts, Waveguides, Ultraviolet radiation, Photonics, Silica, Interferometers, Thermal optics

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For over a decade the field of quantum photonics has increasingly looked towards optical integrated platforms to perform more complex and sophisticated experiments. Silica integrated optics is an ideal material for this area, offering low propagation and fibre-coupling losses. To date many of the key on-chip experiments have been carried out in this platform, using bespoke monolithic devices. In this work we propose an alternative approach, implementing a linear network constructed from a number of identical reconfigurable modules. The modules are measured separately to produce an accurate model of the overall network. The cellular nature also allows the replacement of modules that are faulty or substandard. Each module comprises of an array of 10 Mach-Zhender interferometers. Forty thermo-optic phase shifters on each chip allows the control of both the amplitude and phase of the optical field within the devices. By cascading the modules any arbitrary NxN unitary network can be realised. The optical waveguides within the modules are fabricated by direct UV writing, where a scanning focused UV laser beam increases the local refractive index within a photosensitive germanosilicate glass layer. The resulting channel waveguides are engineered to have dimensions that are mode matched to standard optical fibre producing excellent coupling efficiency. Bragg gratings can also be simultaneously produced within the waveguides which greatly assists in the precise characterisation of the phase shifters, coupling ratios and optical losses within the modules. We will present our recent work in this area, demonstrating devices operating at telecom wavelengths for quantum information processing. We present a modular reconfigurable system for on-chip quantum optics experiments with excellent fibre compatibility and low propagation losses, implemented using direct-UV-written silica-on-silicon. The performance of fabricated devices in various configurations is reported.

Proceedings Article | 6 April 2017 Presentation + Paper

Presentation + Paper

Blind digital holographic microscopy

Patrick Anderson, Florian Wiegandt, Daniel Treacher, Matthias Mang, Ilaria Gianani, Andrea Schiavi, David Lloyd, Kevin O'Keeffe, Simon Hooker, Ian Walmsley

Proceedings Volume 10127, 101270H (2017) https://doi.org/10.1117/12.2250317

KEYWORDS: Digital holography, Holography, Microscopy, Reconstruction algorithms, Phase retrieval, Holograms, Sensors, Laser beam diagnostics, Spatial resolution, Numerical simulations, Spherical lenses

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Proceedings Article | 6 March 2013 Paper

Paper

Towards scalable photonics via quantum storage

J. Nunn, N. Langford, W. Kolthammer, T. F. Champion, M. Sprague, P. Michelberger, X.-M. Jin, D. England, I. Walmsley

Proceedings Volume 8636, 863612 (2013) https://doi.org/10.1117/12.2012487

KEYWORDS: Photons, Quantum memory, Single photon, Photonics, Quantum optics, Quantum information processing, Neodymium, Multiplexing, Scattering, Clocks

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Proceedings Article | 4 August 2005 Paper

Paper

Efficient conditional preparation and assessment of single photon wavepackets based on spontaneous parametric downconversion in a KTP nonlinear waveguide (Invited Paper)

Alfred U'Ren, Christine Silberhorn, Jonathan Ball, Konrad Banaszek, Ian Walmsley

Proceedings Volume 5866, (2005) https://doi.org/10.1117/12.616191

KEYWORDS: Single photon, Waveguides, Signal detection, Ferroelectric materials, Photodetectors, Luminescence, Quantum efficiency, Signal attenuation, Single photon detectors, Sensors

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Proceedings Article | 21 March 2005 Paper

Paper

Characterizing space-time coupling of the electric field of ultrashort pulses using the SPIDER technique

Ellen Kosik Williams, Christophe Dorrer, Aleksander Radunsky, Ian Walmsley

Proceedings Volume 5714, (2005) https://doi.org/10.1117/12.602115

KEYWORDS: Spectroscopy, Ultrafast phenomena, Interferometry, Phase shift keying, Nonlinear crystals, Prisms, Shearing interferometers, Calibration, Modulation, Spectral resolution

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SPIE Journal Paper | 1 July 2004

Non-edge-ray design: improved optical pumping of lasers

R. John Koshel, Ian Walmsley

OE, Vol. 43, Issue 07, (July 2004) https://doi.org/10.1117/12.10.1117/1.1751400

KEYWORDS: Rod lasers, Absorption, Reflectors, Diodes, Semiconductor lasers, Optical pumping, Solar concentrators, Nd:YAG lasers, Nonimaging optics, Transmission electron microscopy

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Proceedings Article | 19 November 2003 Paper

Paper

Quantum oracles and the optical Bernstein-Vazirani algorithm

Ian Walmsley, Pablo Londero, Christophe Dorrer, Matthew Anderson, Sascha Wallentowitz, Konrad Banaszek

Proceedings Volume 4829, (2003) https://doi.org/10.1117/12.527516

KEYWORDS: Particles, Databases, Quantum computing, Computing systems, Detection and tracking algorithms, Computer programming, Optical components, Data compression, Classical physics, Data processing

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Proceedings Article | 8 May 1996 Paper

Paper

Characterization of noisy trains of ultrashort pulses

Ian Walmsley, Victor Wong

Proceedings Volume 2701, (1996) https://doi.org/10.1117/12.239702

KEYWORDS: Optical filters, Reconstruction algorithms, Correlation function, Signal detection, Nonlinear filtering, Ultrafast phenomena, Stochastic processes, Pulse filters, Spectroscopy, Fourier transforms

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Proceedings Article | 8 May 1996 Paper

Paper

Practical advances in ultrashort-pulse measurement using frequency-resolved optical gating

David Fittinghoff, Rick Trebino, Jason Bowie, John Sweetser, Marco Krumbeugel, Kenneth DeLong, Ian Walmsley

Proceedings Volume 2701, (1996) https://doi.org/10.1117/12.239700

KEYWORDS: Ultrafast phenomena, Interferometry, Solids, Optical testing, Pulsed laser operation, Attenuators, Phase measurement, Signal processing, Glasses, Ultrafast lasers

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Proceedings Article | 10 April 1995 Paper

Paper

Phase retrieval in time-resolved spectral phase measurement

Victor Wong, Ian Walmsley

Proceedings Volume 2377, (1995) https://doi.org/10.1117/12.206408

KEYWORDS: Optical filters, Signal detection, Reconstruction algorithms, Phase measurement, Phase retrieval, Fourier transforms, Nonlinear filtering, Pulse filters, Correlation function, Interferometry

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Proceedings Article | 16 May 1994 Paper

Paper

Pulse-shape measurement using linear interferometers

Victor Wong, Ian Walmsley

Proceedings Volume 2116, (1994) https://doi.org/10.1117/12.175861

KEYWORDS: Signal detection, Optical filters, Sensors, Electronic filtering, Phase only filters, Nonlinear filtering, Reconstruction algorithms, Interferometers, Tomography, Optical components

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Proceedings Article | 17 June 1993 Paper

Paper

Measurement of the amplitude and phase of pulses from passively mode-locked lasers

Victor Wong, R. John Koshel, Mark Beck, Ian Walmsley

Proceedings Volume 1861, (1993) https://doi.org/10.1117/12.147044

KEYWORDS: Pulsed laser operation, Signal detection, Dye lasers, Phase measurement, Optical filters, Ultrafast laser spectroscopy, Glasses, Spectroscopy, Modulation, Prisms

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Proceedings Article | 16 June 1993 Paper

Paper

Development and applications of electro-optics for high-power systems

R. Miller, C. Bonner, Stephen Palese, M. Pereira, Lee Schilling, Ian Walmsley, D. Wang, Zhen Guo

Proceedings Volume 1865, (1993) https://doi.org/10.1117/12.146937

KEYWORDS: Crystals, Ferroelectric materials, Diodes, Semiconductor lasers, Electro optics, Electro optical modeling, Fermium, Frequency modulation, Birefringence, Modulators

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Showing 5 of 16 publications

Proceedings Volume Editor (1)

SPIE Conference Volume | 16 May 1994

Generation, Amplification, and Measurement of Ultrashort Laser Pulses

Conference Committee Involvement (5)

The Nature of Light: What are Photons? IV

22 August 2011 | San Diego, California, United States

The Nature of Light: What are Photons? III

3 August 2009 | San Diego, California, United States

The Nature of Light: What are photons?

26 August 2007 | San Diego, California, United States

The Nature of Light: What is a Photon?

1 August 2005 | San Diego, California, United States

Generation, Amplification, and Measurement of Ultrashort Laser Pulses

25 January 1994 | Los Angeles, CA, United States

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