Fast autonomous holographic adaptive optics

G. Andersen

doi:10.1117/12.855671

28 July 2010 Fast autonomous holographic adaptive optics

G. Andersen

Proceedings Volume 7736, Adaptive Optics Systems II; 77362O (2010) https://doi.org/10.1117/12.855671
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

Abstract

We have created a new adaptive optics system using a holographic modal wavefront sensing method capable of autonomous (computer-free) closed-loop control of a MEMS deformable mirror. A multiplexed hologram is recorded using the maximum and minimum actuator positions on the deformable mirror as the "modes". On reconstruction, an input beam will be diffracted into pairs of focal spots - the ratio of particular pairs determines the absolute wavefront phase at a particular actuator location. The wavefront measurement is made using a fast, sensitive photo-detector array such as a multi-pixel photon counters. This information is then used to directly control each actuator in the MEMS DM without the need for any computer in the loop. We present initial results of a 32-actuator prototype device. We further demonstrate that being an all-optical, parallel processing scheme, the speed is independent of the number of actuators. In fact, the limitations on speed are ultimately determined by the maximum driving speed of the DM actuators themselves. Finally, being modal in nature, the system is largely insensitive to both obscuration and scintillation. This should make it ideal for laser beam transmission or imaging under highly turbulent conditions.

Citation Download Citation

G. Andersen "Fast autonomous holographic adaptive optics", Proc. SPIE 7736, Adaptive Optics Systems II, 77362O (28 July 2010); https://doi.org/10.1117/12.855671

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