Fast & Furious focal-plane wavefront sensing

Abstract

We present two complementary algorithms suitable for using focal-plane measurements to control a wavefront corrector with an extremely high spatial resolution. The algorithms use linear approximations to iteratively minimize the aberrations seen by the focal-plane camera. The first algorithm, Fast & Furious (FF), uses a weak-aberration assumption and pupil symmetries to achieve fast wavefront reconstruction. The second algorithm, an extension to FF, can deal with an arbitrary pupil shape; it uses a Gerchberg-Saxton style error reduction to determine the pupil amplitudes. Simulations and experimental results are shown for a spatial light modulator controlling the wavefront with a resolution of 170 x 170 pixels. The algorithms increase the Strehl ratio from ~0.75 to 0.98-0.99, and the intensity of the scattered light is reduced throughout the whole recorded image of 320 x 320 pixels. The remaining wavefront rms error is estimated to be ~0.15 rad with FF and ~0.10 rad with FF-GS.

17 pages, 15 figures, accepted for publication in Applied Optics

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Cited by in corpus (13)

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• Laboratory verification of 'Fast & Furious' phase diversity: Towards controlling the low wind effect in the SPHERE instrument
• Overview of focal plane wavefront sensors to correct for the Low Wind Effect on SUBARU/SCExAO
• Cascade adaptive optics with a second stage based on a Zernike wavefront sensor for exoplanet observations
• Redundant apodization for direct imaging of exoplanets 2: Application to island effects
• Astrophotonics -- current capabilities and the road ahead
• Cophasing multiple aperture telescopes with Linearized Analytic Phase Diversity (LAPD)
• Focal-plane wavefront sensing with high-order adaptive optics systems
• Focal-plane wavefront sensing with moderately broadband light using a short multi-mode fiber
• Focal plane wavefront control with model-based reinforcement learning
• Focal Plane Wavefront Sensing on SUBARU/SCExAO