From Event: SPIE Optical Engineering + Applications, 2017
Unconventional wavefront sensing strategies are being developed to provide alternatives for measuring the wave-front deformation of a laser beam propagating through strong turbulence and/or along a horizontal path. In this paper we present a modified wavefront-sensorless (WFS) adaptive optical (AO) system where the well-known stochastic parallel gradient descent (SPGD) algorithm is extended with a-priori knowledge of the spatial and temporal statistics related to atmospheric turbulence. Here, a modal implementation of the correction algorithm allows us to exploit modal wavefront decomposition to decrease SPGD optimization complexity. We also propose an implementation of a modal decomposition based on Karhunen-Lo eve polynomials instead of the common Zernike polynomials. Appropriate calibration of the deformable mirror is also presented. Performance evaluation of this modified wavefront-sensorless AO system is carried out in a realistic simulated turbulence environment and the results are compared against the traditional, zonal SPGD algorithms.
Max Segel, Andreas Zepp, Esdras Anzuola, Szymon Gladysz, and Karin Stein, "Optimization of wavefront-sensorless adaptive optics for horizontal laser beam propagation in a realistic turbulence environment," Proc. SPIE 10408, Laser Communication and Propagation through the Atmosphere and Oceans VI, 104080E (Presented at SPIE Optical Engineering + Applications: August 08, 2017; Published: 30 August 2017); https://doi.org/10.1117/12.2276240.
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