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Proceedings Paper

Pyramid wavefront sensing: theory and component technology development at LAO
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Paper Abstract

Pyramid wavefront sensors offer an alternative to traditional Hartmann sensing for wavefront measurement in astronomical adaptive optics systems. The Pyramid sensor has been described as a slope sensor with potential sensitivity gains over the Shack Hartmann sensor, but in actuality seems to exhibit traits of both a slope sensor and a direct phase sensor. The original configuration, utilizing glass pyramids and modulation techniques, is difficult to implement. We present results of laboratory experiments using a Pyramid sensor that utilizes a micro-optic lenslet array in place of a glass pyramid, and does not require modulation. A group of four lenslets forms both the pyramid knife-edge and the pupil reimaging functions. The lenslet array is fabricated using a technique that pays careful attention to the quality of the edges and corners of the lenslets. The devices we have tested show less than 1 micron edge and corner imperfections, making them some of the sharpest edges available. We finish by comparing our results to theoretical wave optic predictions which clearly show the dual nature of the sensor.

Paper Details

Date Published: 27 June 2006
PDF: 11 pages
Proc. SPIE 6272, Advances in Adaptive Optics II, 62724R (27 June 2006); doi: 10.1117/12.672364
Show Author Affiliations
Jess A. Johnson, Univ. of California, Santa Cruz (United States)
Renate Kupke, Univ. of California, Santa Cruz (United States)
Donald Gavel, Univ. of California, Santa Cruz (United States)
Brian Bauman, Univ. of California, Santa Cruz (United States)

Published in SPIE Proceedings Vol. 6272:
Advances in Adaptive Optics II
Brent L. Ellerbroek; Domenico Bonaccini Calia, Editor(s)

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