Adaptive optics system with micromachined mirror array and stochastic gradient descent controller

Thomas Weyrauch; Mikhail A. Vorontsov; Thomas G. Bifano; Michael K. Giles

doi:10.1117/12.407500

22 November 2000 Adaptive optics system with micromachined mirror array and stochastic gradient descent controller

Thomas Weyrauch, Mikhail A. Vorontsov, Thomas G. Bifano, Michael K. Giles

Proceedings Volume 4124, High-Resolution Wavefront Control: Methods, Devices, and Applications II; (2000) https://doi.org/10.1117/12.407500
Event: International Symposium on Optical Science and Technology, 2000, San Diego, CA, United States

Abstract

An adaptive laser beam focusing system comprising a 4 X 4 segment (5 X 5 actuator) MEMS deformable mirror developed at Boston University is presented. Mirror actuators were controlled by a circuit using VLSI chips implementing a stochastic parallel gradient descent algorithm. The system allowed for an enhancement of the iteration rate up to 5900 s^-1, limited only by the used computer equipment. Results of experiments for characterization of the MEMS mirror response and the adaptation speed of the system are reported. A further improvement of adaptation speed was achieved by modification of the control algorithm implementing a self- optimization of one parameter.

Citation Download Citation

Thomas Weyrauch, Mikhail A. Vorontsov, Thomas G. Bifano, and Michael K. Giles "Adaptive optics system with micromachined mirror array and stochastic gradient descent controller", Proc. SPIE 4124, High-Resolution Wavefront Control: Methods, Devices, and Applications II, (22 November 2000); https://doi.org/10.1117/12.407500

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