Experimental trials with the optical differentiation wavefront sensor for extended objects

Meghan Farris O'Brien; Sebastiaan Y. Haffert; Joseph D. Long; Lauren Schatz; Jared R. Males; Kyle Van Gorkom; Alex Rodack

doi:10.1117/12.2629485

29 August 2022 Experimental trials with the optical differentiation wavefront sensor for extended objects

Meghan Farris O'Brien, Sebastiaan Y. Haffert, Joseph D. Long, Lauren Schatz, Jared R. Males, Kyle Van Gorkom, Alex Rodack

Author Affiliations +

Proceedings Volume 12185, Adaptive Optics Systems VIII; 121851J (2022) https://doi.org/10.1117/12.2629485
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Abstract

Commonly used wavefront sensors - the Shack Hartmann wavefront sensor and the pyramid wavefront sensor, for example - have large dynamic range or high sensitivity, trading one regime for the other. A new type of wavefront sensor is being developed and is currently undergoing testing at the University of Arizona’s Center for Astronomical Adaptive Optics. This sensor builds on linear optical differentiation theory by using linear, spatially varying half-wave plates in an intermediate focal plane. These filters, along with polarizing beam splitters, divide the beam into four pupil images, similar to those produced by the pyramid wavefront sensor. The wavefront is then reconstructed from the local wavefront slope information contained in these images. The ODWFS is ideally suited for wavefront sensing on extended objects because of its large dynamic range and because it operates in a pupil plane which allows for on chip resampling even for arbitrarily shaped sources. We have assembled the ODWFS on a testbed using a 32 x 32 square 1000 actuator deformable mirror to introduce aberration into a simulated telescope beam. We are currently testing the system’s spatial frequency response and are comparing the resulting data to numerical simulations. This paper presents the results of these initial experiments.

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Citation Download Citation

Meghan Farris O'Brien, Sebastiaan Y. Haffert, Joseph D. Long, Lauren Schatz, Jared R. Males, Kyle Van Gorkom, and Alex Rodack "Experimental trials with the optical differentiation wavefront sensor for extended objects", Proc. SPIE 12185, Adaptive Optics Systems VIII, 121851J (29 August 2022); https://doi.org/10.1117/12.2629485

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