Adaptive optics for small satellite remote sensing system using LCOS-SLM as a phase diversity generator

摘要

The purpose of this paper is to develop adaptive optics system which estimates degrading factors using observed images and automatically compensates the distorted wavefronts using a spatial light modulator (SLM). The system estimates optical wavefront aberrations by phase diversity method. The SLM which is used for wavefront compensation applies multiple time-series known wavefronts as a priori information to the optical system. By using the SLM for the phase diversity generator, it is possible to select the optimal number and shape of phase diversities for various kinds of natural modes of wavefront aberrations which are represented by the Zemike polynomials. In laboratory test, wavefront aberrations were generated by optical misalignments, and they were estimated as the coefficients of Zemike polynomials for an extended scene. The suggested method was validated by numerical simulations and laboratory tests. The high estimation accuracy of the distorted wavefront was demonstrated, and nearly diffraction limited images were acquired by wavefront compensation.