Deformable mirror-based pupil chopping for exoplanet imaging and adaptive optics

Javier Perez Soto; Cesar Laguna; Benjamin Gerard; Anne Dattilo; Vincent Chambouleyron; Rebecca Jensen-Clem

doi:10.1117/12.2676556

5 October 2023 Deformable mirror-based pupil chopping for exoplanet imaging and adaptive optics

Javier Perez Soto, Cesar Laguna, Benjamin Gerard, Anne Dattilo, Vincent Chambouleyron, Rebecca Jensen-Clem

Proceedings Volume 12680, Techniques and Instrumentation for Detection of Exoplanets XI; 126801P (2023) https://doi.org/10.1117/12.2676556
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Conference Poster

Abstract

Due to turbulence in the atmosphere images taken from ground-based telescopes become distorted. With Adaptive Optics (AO) images can be given greater clarity allowing for better observations with existing telescopes and are essential for ground-based coronagraphic exoplanet imaging instruments. A disadvantage to many AO systems is that they use sensors that cannot correct for non-common path aberrations. We have developed a new focal plane wavefront sensing technique to address this problem called Deformable Mirror (DM)-based pupil chopping. The process involves a coronagraphic or non-coronagraphic science image and a deformable mirror, which modulates the phase by applying a local tip/tilt every other frame which enables correcting for leftover aberrations in the wavefront after a conventional AO correction. We validate this technique with both simulations (for coronagraphic and non-coronagraphic images) and testing (for non-coronagraphic images) on UCSC’s Santa Cruz Extreme AO Laboratory (SEAL) testbed. We demonstrate that with as low as 250 nm of DM stroke to apply the local tip/tilt this wavefront sensor is linear for low-order Zernike modes and enables real-time control, in principle up to kHz speeds to correct for residual atmospheric turbulence.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Javier Perez Soto, Cesar Laguna, Benjamin Gerard, Anne Dattilo, Vincent Chambouleyron, and Rebecca Jensen-Clem "Deformable mirror-based pupil chopping for exoplanet imaging and adaptive optics", Proc. SPIE 12680, Techniques and Instrumentation for Detection of Exoplanets XI, 126801P (5 October 2023); https://doi.org/10.1117/12.2676556

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