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Proceedings Paper

Simplex optimization-based dynamic wavefront control for mitigation of atmospheric distortions of the laser beam
Author(s): Vladimir V. Nikulin
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Paper Abstract

Development of long-range laser communication devices capable of operating within Earth’s atmosphere is a challenging task. Turbulence effects cause changes of the refractive index along the propagation path that lead to phase distortions (aberrations), thus creating random optical energy redistribution in the spatial domain and imposing performance limitations on the laser systems. A common method of mitigating these effects suggests dynamic wavefront control. In this paper the proposed technique is based on correction of the distorted beam using an electrically addressed programmable spatial light modulator (SLM). The phase profile that we impose on the distorted laser beam is described by a general two-dimensional wavefront OPD function. The simplex algorithm facilitates dynamic optimization of the system performance metric J as a function of control parameters (the polynomial coefficients). The resultant polynomial is used for calculation of the corrective phase profiles to be loaded onto the programmable phase modulator. The proposed control algorithm is independent of the system model and offers the advantage of blind (“model-free”) optimization. The wavefront correction system is implemented in a simulation setup. Its performance is assessed in terms of convergence, speed, robustness and the ability to reduce the effects of wavefront distortions.

Paper Details

Date Published: 27 January 2004
PDF: 8 pages
Proc. SPIE 5160, Free-Space Laser Communication and Active Laser Illumination III, (27 January 2004); doi: 10.1117/12.506424
Show Author Affiliations
Vladimir V. Nikulin, SUNY/Binghamton (United States)

Published in SPIE Proceedings Vol. 5160:
Free-Space Laser Communication and Active Laser Illumination III
David G. Voelz; Jennifer C. Ricklin, Editor(s)

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