Fast computer-free holographic adaptive optics

Geoff P. Andersen; Fassil Ghebremichael; Ravi Gaddipati; Phani Gaddipati; Paul Gelsinger-Austin; Ken MacDonald

doi:10.1117/12.2015900

3 June 2013 Fast computer-free holographic adaptive optics

Geoff P. Andersen, Fassil Ghebremichael, Ravi Gaddipati, Phani Gaddipati, Paul Gelsinger-Austin, Ken MacDonald

Proceedings Volume 8744, Automatic Target Recognition XXIII; 87440Y (2013) https://doi.org/10.1117/12.2015900
Event: SPIE Defense, Security, and Sensing, 2013, Baltimore, Maryland, United States

Abstract

We have created a new autonomous (computer-free) adaptive optics system using holographic modal wavefront sensing and closed-loop control of a MEMS deformable mirror (DM). A multiplexed hologram is recorded using the maximum and minimum actuator positions on the deformable mirror as the "modes". On reconstruction, an input beam is diffracted into pairs of focal spots and the ratio of the intensities of certain pairs determines the absolute wavefront phase at a particular actuator location. We present the results from an ultra-compact, 32-actuator prototype device operating at 100 kHz. It is largely insensitive to obscuration and has a speed independent of the number of actuators.

Citation Download Citation

Geoff P. Andersen, Fassil Ghebremichael, Ravi Gaddipati, Phani Gaddipati, Paul Gelsinger-Austin, and Ken MacDonald "Fast computer-free holographic adaptive optics", Proc. SPIE 8744, Automatic Target Recognition XXIII, 87440Y (3 June 2013); https://doi.org/10.1117/12.2015900

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