Optical-turbulence characterization of a littoral test environment using a Shack-Hartmann wavefront sensor

Timothy J. Bukowski; Shannon O'Sullivan; Matthew Kalensky; Darren Getts; Evan M. Bates; Kelsey Miller; Stanislav Gordeyev

doi:10.1117/12.2676710

3 October 2023 Optical-turbulence characterization of a littoral test environment using a Shack-Hartmann wavefront sensor

Timothy J. Bukowski, Shannon O'Sullivan, Matthew Kalensky, Darren Getts, Evan M. Bates, Kelsey Miller, Stanislav Gordeyev

Author Affiliations +

Proceedings Volume 12693, Unconventional Imaging, Sensing, and Adaptive Optics 2023; 126930Q (2023) https://doi.org/10.1117/12.2676710
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Abstract

Beam propagation systems are often used in a wide range of atmospheric environments. Therefore, it is important to be able to characterize those environments in order to appropriately assess performance and inform design decisions. In this paper, a variety of methods for measuring atmospheric coherence length, r₀, were analyzed including a Shack–Hartmann-based differential image motion monitor (DIMM), gradient-tilt variance, slope discrepancy variance, and phase variance methods, as well as using the modulation transfer function (MTF). These methods were tested on varying turbulence strength environments with known atmospheric coherence lengths, first using a single modified von Kármán phase screen, then using full wave-optics simulations with 20 phase screens. The Shack–Hartmann based approaches were shown to greatly increase in error for d/r₀ > 1 due to discrepancies between gradient tilt and the centroid tilt measured from the SHWFS’ image-plane irradiance patterns. An atmospheric data collection system was built and experimental results were taken for a beam propagating 2.4 km through a littoral environment over a 24 hour period.

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

Citation Download Citation

Timothy J. Bukowski, Shannon O'Sullivan, Matthew Kalensky, Darren Getts, Evan M. Bates, Kelsey Miller, and Stanislav Gordeyev "Optical-turbulence characterization of a littoral test environment using a Shack-Hartmann wavefront sensor", Proc. SPIE 12693, Unconventional Imaging, Sensing, and Adaptive Optics 2023, 126930Q (3 October 2023); https://doi.org/10.1117/12.2676710

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