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Open-loop wavefront sensing in the presence of speckle and weak scintillation.

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Title: Open-loop wavefront sensing in the presence of speckle and weak scintillation.
Authors: Burrell, Derek J.1 (AUTHOR) derekburrell@optics.arizona.edu, Spencer, Mark F.2 (AUTHOR), Driggers, Ronald G.1 (AUTHOR)
Source: Optics Communications. Dec2024, Vol. 572, pN.PAG-N.PAG. 1p.
Subjects: Meteorological optics, Surface scattering, Adaptive optics, Atmospheric turbulence, Wavefront sensors
Abstract: In this paper, we show that speckle averaging helps to reduce the measurement error associated with a Shack–Hartmann wavefront sensor (SHWFS); however, this reduction is rendered ineffective with increasing beacon anisoplanatism. We do so operating in a weak-scintillation regime, where the SHWFS offers robust performance, and using in-plane translation of the illuminated rough surface to accomplish frame-to-frame speckle diversity. Understanding these trade-space limitations is critical when performing wavefront sensing with noncooperative, extended-source beacons. • We derive analytic estimates for RMS wavefront error/aberration in vacuum/turbulence. • We present a new modeling framework to simulate partially correlated speckle frames. • We report simulation results in wavefront error/aberration and irradiance skewness. • We demonstrate the benefits of speckle averaging under isoplanatic conditions. • We identify potential drawbacks of speckle averaging in anisoplanatic conditions. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:In this paper, we show that speckle averaging helps to reduce the measurement error associated with a Shack–Hartmann wavefront sensor (SHWFS); however, this reduction is rendered ineffective with increasing beacon anisoplanatism. We do so operating in a weak-scintillation regime, where the SHWFS offers robust performance, and using in-plane translation of the illuminated rough surface to accomplish frame-to-frame speckle diversity. Understanding these trade-space limitations is critical when performing wavefront sensing with noncooperative, extended-source beacons. • We derive analytic estimates for RMS wavefront error/aberration in vacuum/turbulence. • We present a new modeling framework to simulate partially correlated speckle frames. • We report simulation results in wavefront error/aberration and irradiance skewness. • We demonstrate the benefits of speckle averaging under isoplanatic conditions. • We identify potential drawbacks of speckle averaging in anisoplanatic conditions. [ABSTRACT FROM AUTHOR]
ISSN:00304018
DOI:10.1016/j.optcom.2024.130960