Binary optical correction of wavefront aberration using spatial light modulators

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Scientific paper

This paper presents experimental results from a study of the performance of a ferroelectric liquid crystal spatial light modulator (FLCSLM) used as an aberration corrector. The FLCSLM, with suitable polarizing optics, acts as a binary phase only modulator. Using a cascaded system of three such FLCSLMs we obtain up to eight discrete levels of phase modulation over an array of 128 by 128 pixels. Partial correction of phase aberration is effected by using the FLCSLMs to provide a discretized approximation to the phase conjugate of the aberrated wavefront. Performance limitations due to phase quantization, spatial quantization, and inter-pixel gap are discussed in terms of achievable Strehl ratios. These experimental and theoretical results, coupled with other considerations we present, support the suggestion that FLCSLMs could play a role in adaptive optical systems for astronomical telescopes.

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