High Speed Focal Plane Wavefront Sensing with an Optical Chopper
Benjamin L. Gerard, Daren Dillon, Sylvain Cetre, and Rebecca, Jensen-Clem

TL;DR
This paper introduces a novel high-speed focal plane wavefront sensing method using an optical chopper, enabling simultaneous science imaging and wavefront correction at up to 50% duty cycle, validated through simulations and laboratory tests.
Contribution
It presents a new wavefront sensing technique that uses an optical chopper for amplitude modulation, allowing fast, simultaneous science imaging and wavefront correction without non-common path errors.
Findings
Achieved up to 50% science imaging duty cycle with the technique.
Validated the method through simulations and laboratory experiments.
Demonstrated resolving sine ambiguity of wavefront modes at various frequencies.
Abstract
Focal plane wavefront sensing and control is a critical approach to reducing non-common path errors between the a conventional astronomical adaptive optics (AO) wavefront sensor (WFS) detector and science camera. However, in addition to mitigating non-common path errors, recent focal plane wavefront sensing techniques have been developed to operate at speeds fast enough to enable "multi-WFS" AO, where residual atmospheric errors are further corrected by a focal plane WFS. Although a number of such techniques have been recently developed for coronagraphic imaging, here we present one designed for non-coronagraphic imaging. Utilizing conventional AO system components, this concept additionally requires (1) a detector imaging the focal plane of the WFS light source and (2) a pupil plane optical chopper device that is non-common path to the first WFS and is synchronized to the focal plane…
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Taxonomy
TopicsAdaptive optics and wavefront sensing · Optical Systems and Laser Technology · Advanced optical system design
