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Proceedings Paper

Schack-Hartmann wavefront sensing measurements of near-ground propagated laser beams
Author(s): Pierre R. Barbier; Penelope Polak-Dingels; David W. Rush; Geoffrey L. Burdge; Bruce Martin Levine; Elizabeth A. Martinsen; Allan Wirth; Andrew J. Jankevics
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Paper Abstract

Adaptive optics systems could be used to maintain the quality of a communication laser beam propagated near ground over a few kilometers of turbulent atmosphere. Such an adaptive optics system may incorporate a Shack- Hartmann sensor to measure the wavefront of an arriving beacon laser beam before precompensating that of the communication laser beam through a deformable mirror. We present experimental measurements of the wavefront of a laser beam propagated over distances of 0.94 and 2.4 km acquired using a 1200-subaperture Shack-Hartmann sensor. These data were acquired at 1 kllz frame rate during 2 second time intervals over the span of several days. We acquired and analyzed 41 sets of data. Our analysis shows that the atmosphere is not stationary over these 2second intervals, that the statistics of the wavefront may look very different for the same measured value of the atmosphere structure constant (C) and does not always follow the theoretical predictions based on Kolmogorov turbulence, and that the subtraction of the first 11 Zernike polynomials (first-order correction) improves the wavefront significantly unlike the subtraction of next 1 1 polynomials (third-order correction).

Paper Details

Date Published: 23 September 1997
PDF: 12 pages
Proc. SPIE 3125, Propagation and Imaging through the Atmosphere, (23 September 1997); doi: 10.1117/12.283901
Show Author Affiliations
Pierre R. Barbier, Univ. of Maryland/College Park (United States)
Penelope Polak-Dingels, Univ. of Maryland/College Park (United States)
David W. Rush, Univ. of Maryland/College Park (United States)
Geoffrey L. Burdge, Lab. for Physical Sciences (United States)
Bruce Martin Levine, Adaptive Optics Associates, Inc. (United States)
Elizabeth A. Martinsen, Adaptive Optics Associates, Inc. (United States)
Allan Wirth, Adaptive Optics Associates, Inc. (United States)
Andrew J. Jankevics, Adaptive Optics Associates, Inc. (United States)


Published in SPIE Proceedings Vol. 3125:
Propagation and Imaging through the Atmosphere
Luc R. Bissonnette; Christopher Dainty, Editor(s)

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