Adaptive compensation of dynamic wavefront aberrations based on blind optimization technique

摘要

Abstract: In this paper, we present experimental results of dynamic aberration correction based on gradient descend algorithms. The experimental setup included a 37-actuators piezoelectric deformable mirror to distort dynamically an input laser beam and a 37-element micromachined deformable membrane mirror to correct the resulting wavefront distortions. We generated time-varying aberrations using the first mirror and used the light power focused onto a pinhole as our optimization matrix. We programmed a computer to maximize this metric and control the shape of the micromachined deformable membrane mirror for wavefront correction. We implemented in this computer a simple gradient descend algorithm and a stochastic perturbation gradient descent algorithm. We present experimental data on the convergence and stability of this adaptive system for various conditions of dynamic turbulence.!10