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

Ernst Polnau; Mikhail A. Vorontsov; Gary Carhart; Thomas Weyrauch; Leonid A. Beresnev

doi:10.1117/12.736310

25 September 2007 Adaptive compensation over a 2.33 km propagation path with retro reflectors under strong scintillation conditions

Ernst Polnau, Mikhail A. Vorontsov, Gary Carhart, Thomas Weyrauch, Leonid A. Beresnev

Author Affiliations +

Proceedings Volume 6708, Atmospheric Optics: Models, Measurements, and Target-in-the-Loop Propagation; 67080C (2007) https://doi.org/10.1117/12.736310
Event: Optical Engineering + Applications, 2007, San Diego, California, United States

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.

Citation Download Citation

Ernst Polnau, Mikhail A. Vorontsov, Gary Carhart, Thomas Weyrauch, and Leonid A. Beresnev "Adaptive compensation over a 2.33 km propagation path with retro reflectors under strong scintillation conditions", Proc. SPIE 6708, Atmospheric Optics: Models, Measurements, and Target-in-the-Loop Propagation, 67080C (25 September 2007); https://doi.org/10.1117/12.736310

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KEYWORDS

Telescopes

Control systems

Adaptive optics

Reflectors

Signal detection

Sensors

Deformable mirrors

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