Dr. Benjamin J. S. Pope Profile

Dr. Benjamin J. S. Pope

at The Univ. of Queensland

SPIE Involvement:

Author

Publications (9)

SPIE Journal Paper | 26 June 2023

Differentiable optics with ∂Lux: I—deep calibration of flat field and phase retrieval with automatic differentiation

Louis Desdoigts, Benjamin J. S. Pope, Jordan Dennis, Peter G. Tuthill

JATIS, Vol. 9, Issue 02, 028007, (June 2023) https://doi.org/10.1117/12.10.1117/1.JATIS.9.2.028007

KEYWORDS: Calibration, Point spread functions, Data modeling, Phase retrieval, Optical aberrations, Mathematical optimization, Machine learning, Wavefronts, Pupil aberrations, Astronomical imaging

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Proceedings Article | 27 August 2022 Poster + Paper

Optical design, analysis, and calibration using ∂Lux

Louis Desdoigts, Benjamin Pope, Peter Tuthill

Proceedings Volume 12180, 1218032 (2022) https://doi.org/10.1117/12.2629774

KEYWORDS: Point spread functions, Calibration, Data modeling, Modeling, Telescopes, Neural networks, Optical design, Sensors

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Proceedings Article | 9 July 2018 Paper

The TOLIMAN space telescope

Peter Tuthill, Eduardo Bendek, Olivier Guyon, Anthony Horton, Bryn Jeffries, Nemanja Jovanovic, Pete Klupar, Kieran Larkin, Barnaby Norris, Benjamin Pope, Mike Shao

Proceedings Volume 10701, 107011J (2018) https://doi.org/10.1117/12.2313269

KEYWORDS: Stars, Planets, Point spread functions, Space telescopes, Telescopes, Exoplanets, Astronomy, Diffraction, Photons, Sensors

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Proceedings Article | 9 July 2018 Paper

Planet formation imager: project update

John Monnier, Michael Ireland, Stefan Kraus, Almudena Alonso-Herrero, Amy Bonsor, Fabien Baron, Amelia Bayo, Jean-Philippe Berger, Tabetha Boyajian, Andrea Chiavassa, David Ciardi, Michelle Creech-Eakman, Willem-Jan de Wit, Denis Defrère, Ruobing Dong, Gaspard Duchêne, Catherine Espaillat, Alexandre Gallenne, Poshak Gandhi, Jean-Francois Gonzalez, Chris Haniff, Sebastian Hoenig, John Ilee, Andrea Isella, Eric Jensen, Attila Juhasz, Stephen Kane, Makoto Kishimoto, Wilhelm Kley, Quentin Kral, Kaitlin Kratter, Lucas Labadie, Sylvestre Lacour, Greg Laughlin, Jean-Baptiste Le Bouquin, Ernest Michael, Farzana Meru, Rafael Millan-Gabet, Florentin Millour, Stefano Minardi, Alessandro Morbidelli, Chris Mordasini, Andreas Morlok, Dave Mozurkewich, Richard Nelson, Johan Olofsson, Rene Oudmaijer, Chris Packham, Claudia Paladini, Olja Panic, Romain Petrov, Benjamin Pope, Joerg-Uwe Pott, Luis Henry Quiroga-Nunez, Cristina Ramos Almeida, Sean Raymond, Zsolt Regaly, Mark Reynolds, Stephen Ridgway, Stephen Rinehart, Matthias Schreiber, Michael Smith, Keivan Stassun, Jean Surdej, Theo ten Brummelaar, Konrad Tristram, Neal Turner, Peter Tuthill, Gerard van Belle, Gautum Vasisht, Alexander Wallace, Gerd Weigelt, Edward Wishnow, Markus Wittkowski, Sebastian Wolf, John Young, Ming Zhao, Zhaohuan Zhu, Sebastian Zúñiga-Fernández

Proceedings Volume 10701, 1070118 (2018) https://doi.org/10.1117/12.2312683

KEYWORDS: Planets, Telescopes, Space telescopes, Exoplanets, Stars, Mid-IR, Interferometry, Signal to noise ratio, Interferometers, Heterodyning

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Proceedings Article | 4 August 2016 Paper

Planet Formation Imager (PFI): science vision and key requirements

Stefan Kraus, John Monnier, Michael Ireland, Gaspard Duchêne, Catherine Espaillat, Sebastian Hönig, Attila Juhasz, Chris Mordasini, Johan Olofsson, Claudia Paladini, Keivan Stassun, Neal Turner, Gautam Vasisht, Tim Harries, Matthew Bate, Jean-François Gonzalez, Alexis Matter, Zhaohuan Zhu, Olja Panic, Zsolt Regaly, Alessandro Morbidelli, Farzana Meru, Sebastian Wolf, John Ilee, Jean-Philippe Berger, Ming Zhao, Quentin Kral, Andreas Morlok, Amy Bonsor, David Ciardi, Stephen Kane, Kaitlin Kratter, Greg Laughlin, Joshua Pepper, Sean Raymond, Lucas Labadie, Richard Nelson, Gerd Weigelt, Theo ten Brummelaar, Arnaud Pierens, Rene Oudmaijer, Wilhelm Kley, Benjamin Pope, Eric L. Jensen, Amelia Bayo, Michael Smith, Tabetha Boyajian, Luis Henry Quiroga-Nuñez, Rafael Millan-Gabet, Andrea Chiavassa, Alexandre Gallenne, Mark Reynolds, Willem-Jan de Wit, Markus Wittkowski, Florentin Millour, Poshak Gandhi, Cristina Ramos Almeida, Almudena Alonso Herrero, Chris Packham, Makoto Kishimoto, Konrad R. Tristram, Jörg-Uwe Pott, Jean Surdej, David Buscher, Chris Haniff, Sylvestre Lacour, Romain Petrov, Steve Ridgway, Peter Tuthill, Gerard van Belle, Phil Armitage, Clement Baruteau, Myriam Benisty, Bertram Bitsch, Sijme-Jan Paardekooper, Christophe Pinte, Frederic Masset, Giovanni Rosotti

Proceedings Volume 9907, 99071K (2016) https://doi.org/10.1117/12.2231067

KEYWORDS: Planets, Imaging systems, Exoplanets, Planetary systems, Astrophysics, Stars, Astronomy, Theoretical astronomy, Observatories, Physics

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Proceedings Article | 28 August 2014 Paper

Non-redundant masking ideas on JWST

Anand Sivaramakrishnan, Anthony Cheetham, Alexandra Greenbaum, Peter Tuthill, D. Scott Acton, Benjamin Pope, Frantz Martinache, Deepashri Thatte, Edmund Nelan

Proceedings Volume 9143, 91433S (2014) https://doi.org/10.1117/12.2056639

KEYWORDS: Image segmentation, James Webb Space Telescope, Point spread functions, Wavefront sensors, Space telescopes, Telescopes, Mirrors, Sensors, Cameras, Wavefronts

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Proceedings Article | 21 July 2014 Paper

Wavefront sensing from the image domain with the Oxford-SWIFT integral field spectrograph

Benjamin Pope, Niranjan Thatte, Rick Burruss, Matthias Tecza, Fraser Clarke, Garret Cotter

Proceedings Volume 9148, 914859 (2014) https://doi.org/10.1117/12.2055334

KEYWORDS: Adaptive optics, Wavefronts, Wavefront sensors, Space telescopes, Spectrographs, Telescopes, Calibration, Point spread functions, Image quality, Diffraction

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The limits for adaptive-optics-assisted and space-based astronomical imaging at high contrast and high resolution are typically determined by residual phase errors due to non-common-path aberrations not sensed by the wavefront sensor. These impose quasi-static speckles on the image, which are difficult to calibrate as they vary in time and with telescope orientation. Typical approaches require phase diversity of some sort,¹ which requires many iterations and is accordingly time-consuming. This is especially true of integral field spectrographs, where use of standard phase diversity based techniques is additionally complicated by the presence of the image slicer/integral field unit. We present the first application of the kernel phase based ‘asymmetric pupil Fourier wavefront sensing’ scheme to ground-based AO-corrected integral field spectroscopy, whereby an asymmetric pupil mask and a single image are sufficient to map aberrations up to high order, including non-common-path error. This method is closely connected with kernel phase interferometry, already applied to space-based and AO-assisted imaging, in which a phase transfer matrix formalism partitions focal plane Fourier phases into a kernel space which is self- calibrating with respect to pupil aberrations, and a row space which can be used to determine those aberrations via a matrix pseudo-inverse. This requires two key conditions be satisfied: the first, that phase errors are < 1 radian in magnitude. These conditions are typically satisfied for space-based telescopes such as the HST, or AO-corrected ground-based telescopes in the near-infrared. The second requirement is that the telescope pupil is not centro-symmetric; this can be achieved simply by placing an asymmetric mask in the optical path. The row phase reconstruction then provides a phase map which can be applied directly to a deformable mirror as a static offset. While in our approach we have iteratively applied corrections, we have deliberately damped correction steps, and in principle this can be done in a single step. We push toward internally diffraction-limited performance with the Oxford-SWIFT integral field spectrograph coupled with the PALM-3000 extreme AO system on the Palomar 200-inch telescope. This represents the first observation in which the PALM3000 + SWIFT internal point-spread-function has closely approached the Airy pattern. While this can only be used on SWIFT with an internal stimulus source, as at short wavelengths the uncorrected atmospheric wavefront errors are still < 1 radian, this nevertheless demonstrates the feasibility of detecting non-common-path errors with this method as an active optics paradigm for near-infrared, AO-corrected instruments on Palomar such as PHARO or Project 1640 (P1640), or other instruments such as VLT-SPHERE or the Gemini Planet Imager (GPI). We note that this is a particularly promising approach for correcting integral field spectrographs, as the diversity of many narrowband images provides strong constraints on the wavefront error estimate, and the average of reconstructions from many narrow bands can be used to improve overall reconstruction quality.

Proceedings Article | 22 July 2010 Paper

Photonic technologies for a pupil remapping interferometer

Peter Tuthill, Nemanja Jovanovic, Sylvestre Lacour, Andrew Lehmann, Martin Ams, Graham Marshall, Jon Lawrence, Michael Withford, Gordon Robertson, Michael Ireland, Benjamin Pope, Paul Stewart

Proceedings Volume 7734, 77341P (2010) https://doi.org/10.1117/12.856770

KEYWORDS: Waveguides, Interferometers, Telescopes, Spatial filters, Adaptive optics, Signal to noise ratio, Single mode fibers, Interferometry, Space telescopes, Prototyping

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Proceedings Article | 15 July 2010 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 9 publications

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