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

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

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007spie.6708e..10p&link_type=abstract

Atmospheric Optics: Models, Measurements, and Target-in-the-Loop Propagation. Edited by Hammel, Stephen M.; van Eijk, Alexander

Physics

Optics

Scientific paper

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.

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