Branch-point compensation in extended-beacon adaptive optics

Matthew Kalensky; Derek J. Burrell; Mark F. Spencer; Matthias T. Banet; Denis W. Oesch; Darren Getts

doi:10.1117/12.3026889

7 October 2024 Branch-point compensation in extended-beacon adaptive optics

Matthew Kalensky, Derek J. Burrell, Mark F. Spencer, Matthias T. Banet, Denis W. Oesch, Darren Getts

Author Affiliations +

Proceedings Volume 13149, Unconventional Imaging, Sensing, and Adaptive Optics 2024; 131491G (2024) https://doi.org/10.1117/12.3026889
Event: Optical Engineering + Applications, 2024, San Diego, California, United States

Abstract

In this paper, we use wave-optics simulations to explore laser propagation system performance. We accomplish this by creating a trade space where we vary turbulence conditions as well as beacon size from a point-source beacon to an extended-source beacon with an object Fresnel number, Nobj, of 20. We explore performance when we employ no compensation, perfect phase compensation, and perfect full-phase compensation. The results of this trade space allow us to arrive at three main conclusions. First, if we have either a point-source beacon or a very small extended-source beacon and turbulence is strong, we get a significant improvement in performance using full-phase compensation compared to least-squares compensation and no compensation. If turbulence is weak, we see similar performance with least-squares and full-phase compensation, however, both are significantly improved over the no compensation case. Second, in strong turbulence conditions, there will be a very large number of turbulence-induced branch points. If left uncompensated, these turbulence-induced branch points will result in a major reduction in performance. Lastly, when the extended-source beacon is large, the associated rough-surface-scattering-induced phase aberrations will corrupt the compensation to the point where the drawbacks of compensating for surface-roughness-induced aberrations significantly outweigh the benefits of compensating for turbulence-induced aberrations. These results (1) inform researchers looking to conduct extended-source-beacon adaptive optics and (2) motivate research to explore methods for speckle mitigation in adaptive-optics systems.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Matthew Kalensky, Derek J. Burrell, Mark F. Spencer, Matthias T. Banet, Denis W. Oesch, and Darren Getts "Branch-point compensation in extended-beacon adaptive optics", Proc. SPIE 13149, Unconventional Imaging, Sensing, and Adaptive Optics 2024, 131491G (7 October 2024); https://doi.org/10.1117/12.3026889

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