Interaction of laser radiation with matter. Laser plasma

Minimization of the angular divergence of optical radiation transmitted by a nonlinear layer

I. Yu. Polyakova, A. P. Sukhorukov, V. A. Trofimov


Abstract: An analysis is made of adaptive compensation for the self-interaction of optical radiation in order to minimize its angular divergence in the far-field zone. The compensation quality is governed by the functional of the effective width of the angular spectrum of the beam. A gradient method is used to control the radiation wavefront. Calculations are performed using the aberration-free and quasioptic approximations. The convergence, stability, and speed of the control algorithms and the efficiency of compensation for the angular divergence are analyzed as a function of the following: the nonlinear layer thickness, the nonlinear parameter, the choice of the initial beam focusing, and the control coefficient.

UDC: 621.378.325

PACS: 42.68.Wt, 42.68.Ay, 42.65.Jx

Received: 26.08.1991

 English version: Soviet Journal of Quantum Electronics, 1992, 22:3, 219–222

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