13 September 2012 Fast computer-free holographic adaptive optics
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Proceedings Volume 8447, Adaptive Optics Systems III; 84472L (2012); doi: 10.1117/12.924247
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands
Abstract
We have constructed an adaptive optics system incorporating a holographic wavefront sensor with the autonomous closed-loop control of a MEMS deformable mirror (DM). HALOS incorporates a multiplexed holographic recording of the response functions of each actuator in a deformable mirror. On reconstruction with an arbitrary input beam, pairs of focal spots are produced. By measuring the relative intensities of these spots a full measurement of the absolute phase can be constructed. Using fast photodiodes, direct feedback correction can be applied to the actuators.
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Geoff Andersen, Fassil Ghebremichael, Ravi Gaddipati, Phani Gaddipati, "Fast computer-free holographic adaptive optics", Proc. SPIE 8447, Adaptive Optics Systems III, 84472L (13 September 2012); doi: 10.1117/12.924247; https://doi.org/10.1117/12.924247
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KEYWORDS
Actuators

Holograms

Wavefronts

Adaptive optics

Holography

Deformable mirrors

Multiplexing

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