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Proceedings Paper

Optimization of wavefront-sensorless adaptive optics for horizontal laser beam propagation in a realistic turbulence environment
Author(s): Max Segel; Andreas Zepp; Esdras Anzuola; Szymon Gladysz; Karin Stein
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Paper Abstract

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.

Paper Details

Date Published: 30 August 2017
PDF: 8 pages
Proc. SPIE 10408, Laser Communication and Propagation through the Atmosphere and Oceans VI, 104080E (30 August 2017); doi: 10.1117/12.2276240
Show Author Affiliations
Max Segel, Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung (Germany)
Andreas Zepp, Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung (Germany)
Esdras Anzuola, Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung (Germany)
Szymon Gladysz, Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung (Germany)
Karin Stein, Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung (Germany)


Published in SPIE Proceedings Vol. 10408:
Laser Communication and Propagation through the Atmosphere and Oceans VI
Jeremy P. Bos; Alexander M. J. van Eijk; Stephen M. Hammel, Editor(s)

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