Adaptive optics performance comparisons for various phase reconstruction algorithms

Thomas R. Brown; Timothy L. Berkopec

doi:10.1117/12.323932

8 September 1998 Adaptive optics performance comparisons for various phase reconstruction algorithms

Thomas R. Brown, Timothy L. Berkopec

Proceedings Volume 3381, Airborne Laser Advanced Technology; (1998) https://doi.org/10.1117/12.323932
Event: Aerospace/Defense Sensing and Controls, 1998, Orlando, FL, United States

Abstract

In Airborne Laser (ABL) like systems, the phase information is typically reconstructed from wavefront tilt sensor data using a least-squares approach. The solution to the phase reconstruction problem provides a smooth unwrapped phase surface that is not necessarily equal to the original wrapped phase surface in an optical propagation sense. Still, the computed phase surface furnishes information that can be used in determining the required phase conjugation for partial correction of an atmospherically distorted laser source. In this paper, we examine the effect of two phase reconstruction algorithms; unweighted least-squares and intensity weighted least-squares on the performance of an idealized ABL-like adaptive optics systems under ABL-like atmospheric conditions. The performance of each phase reconstruction algorithm will be investigated using MZA's Airborne Laser Simulation under atmospheres with Rytov numbers ranging from 0.233 to 3.725. Since the unwrapping process creates a phase surface without the 2(pi) discontinuities of the original phase, the r₀ and phase variance can be calculated from the unwrapped phase. These predictors of the phase correlation performance will be related to the performance measures; Strehl and power-in- the-bucket at the target.

Citation Download Citation

Thomas R. Brown and Timothy L. Berkopec "Adaptive optics performance comparisons for various phase reconstruction algorithms", Proc. SPIE 3381, Airborne Laser Advanced Technology, (8 September 1998); https://doi.org/10.1117/12.323932

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