Real-time holographic compensation of large optics for deployment in space

Dennis M. Guthals; Daniel Sox; Michael D. Joswick; Paul J. Rodney

doi:10.1117/12.407506

22 November 2000 Real-time holographic compensation of large optics for deployment in space

Dennis M. Guthals, Daniel Sox, Michael D. Joswick, Paul J. Rodney

Proceedings Volume 4124, High-Resolution Wavefront Control: Methods, Devices, and Applications II; (2000) https://doi.org/10.1117/12.407506
Event: International Symposium on Optical Science and Technology, 2000, San Diego, CA, United States

Abstract

Large deployable space-based optical systems will likely require complex structure position controls in conjunction with an adaptive optic to maintain optical tolerances necessary for near diffraction-limited performance. A real- time holographic (RTH) compensation system can greatly reduce the requirements and complexity of the position control system and enable the use of novel or imperfect optical components for large mirror surfaces. A hologram of the distorted primary is recorded with a local beacon at 532 nm (approximately 100 nJ/exposure) on an optically addressed spatial light modulator and transferred as a phase grating to a ferroelectric liquid crystal layer. The hologram is played back with target light containing the same optical distortion. A corrected image is obtained in the conjugate diffracted order where the phase of the optical distortion is subtracted from the distorted image. We report recent test results and analysis of a RTH- compensated deformed mirror of 0.75 m diameter. The short exposure hologram is recorded at video frequencies (30 Hz) at bandwidths up to 5 kHz. Correction for tens of waves of static and dynamic optical distortions including mechanical and thermal warp, mechanical vibration, and air turbulence are shown for monochromatic (532 nm) and broadband (532 +/- 40 nm) illuminated targets. We also report on the generation of blazed gratings in electrically addressed spatial light modulators to achieve greatly enhanced diffraction efficiencies and to perform beam steering.

Citation Download Citation

Dennis M. Guthals, Daniel Sox, Michael D. Joswick, and Paul J. Rodney "Real-time holographic compensation of large optics for deployment in space", Proc. SPIE 4124, High-Resolution Wavefront Control: Methods, Devices, and Applications II, (22 November 2000); https://doi.org/10.1117/12.407506

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