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Fast & Furious focal-plane wavefront sensing
- Source :
- Applied Optics
- Publication Year :
- 2014
-
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 (GS)-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 170×170 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 320×320 pixels. The remaining wavefront rms error is estimated to be ∼0.15 rad with FF and ∼0.10 rad with FF-GS.
Details
- Database :
- OAIster
- Journal :
- Applied Optics
- Publication Type :
- Electronic Resource
- Accession number :
- edsoai.on1291827087
- Document Type :
- Electronic Resource