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Proceedings Paper

Adaptive compensation over a 2.33 km propagation path with retro reflectors under strong scintillation conditions
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Paper Abstract

A newly developed adaptive optical transceiver telescope is used to investigate the possibility of correcting wavefront aberrations under strong atmospheric turbulence conditions over a distance of several kilometers. A fiber laser is connected to a fiber positioner within the telescope, which acts as a transmitter by sending laser light at wavelength 1550 nm through the turbulent air to a retro reflector mounted on the top of a water tower at a distance of 2.33 km. The reflected laser light is received by the telescope -(acting this time as a receiver) and focused onto the fiber tip. The light picked up by the fiber is - guided to a photo detector by means of a fiber splitter. The signal from the photo detector is recorded by a PC and used as feedback signal for the adaptive optics controller, which controls the fiber-tip positioner as well as an six-channel adaptive mirror using a stochastic parallel gradient descent optimization algorithm. Experimental results are reported in this paper.

Paper Details

Date Published: 25 September 2007
PDF: 10 pages
Proc. SPIE 6708, Atmospheric Optics: Models, Measurements, and Target-in-the-Loop Propagation, 67080C (25 September 2007); doi: 10.1117/12.736310
Show Author Affiliations
Ernst Polnau, Univ. of Maryland, College Park (United States)
Mikhail A. Vorontsov, Univ. of Maryland, College Park (United States)
U.S. Army Research Lab. (United States)
Gary Carhart, U.S. Army Research Lab. (United States)
Thomas Weyrauch, Univ. of Maryland, College Park (United States)
Leonid A. Beresnev, U.S. Army Research Lab. (United States)


Published in SPIE Proceedings Vol. 6708:
Atmospheric Optics: Models, Measurements, and Target-in-the-Loop Propagation
Stephen M. Hammel; Alexander M. J. van Eijk; Michael T. Valley; Mikhail A. Vorontsov, Editor(s)

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