Compensation of large-diameter optical system aberrations with spatial light modulators and deformable mirrors

Hamid Hemmati; Yijiang Chen

doi:10.1117/12.811894

24 February 2009 Compensation of large-diameter optical system aberrations with spatial light modulators and deformable mirrors

Hamid Hemmati, Yijiang Chen

Author Affiliations +

Proceedings Volume 7199, Free-Space Laser Communication Technologies XXI; 71990D (2009) https://doi.org/10.1117/12.811894
Event: SPIE LASE: Lasers and Applications in Science and Engineering, 2009, San Jose, California, United States

Abstract

Compensation of slowly varying wavefront aberrations of low-cost meter-scale optical communication receiver mirror systems is reported. Our goal is to reduce the surface wavefront error of a low-cost large aperture telescope mirror from multiple waves to about 1-wave or less peak-to-valley (P-V). Both spatial light modulators and monolithic deformable mirrors are applied in our active optical compensation systems. Spatial light modulators with only one wave stroke can compensate for aberrations of over 10-waves P-V by using 2π phase wraps, while deformable mirrors are limited to 10- wave aberrations (P-V), due to stroke limitations of commercially available systems. We demonstrate aberration compensations of a low-cost 0.6-m diameter mirror using a deformable mirror and a 0.3-m diameter telescope using a spatial light modulator. Upon aberration compensation, image quality is recovered close to the original, with the residual distortion limited by the diffraction efficiency. The laser beam spot size is reduced by a factor of four, and the measured received signal level is increased ten-fold.

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Hamid Hemmati and Yijiang Chen "Compensation of large-diameter optical system aberrations with spatial light modulators and deformable mirrors", Proc. SPIE 7199, Free-Space Laser Communication Technologies XXI, 71990D (24 February 2009); https://doi.org/10.1117/12.811894

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KEYWORDS

Spatial light modulators

Deformable mirrors

Mirrors

Wavefronts

Actuators

Diffraction

Telescopes

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