9 October 2008 Adaptive optics compensation over a 3 km near horizontal path
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We present results of adaptive optics compensation at the receiver of a 3km optical link using a beacon laser operating at 635nm. The laser is transmitted from the roof of a seven-storey building over a near horizontal path towards a 127 mm optical receiver located on the second-floor of the Applied Optics Group at the National University of Ireland, Galway. The wavefront of the scintillated beam is measured using a Shack-Hartmann wavefront sensor (SHWFS) with high-speed CMOS camera capable of frame rates greater than 1kHz. The strength of turbulence is determined from the fluctuations in differential angle-of-arrival in the wavefront sensor measurements and from the degree of scintillation in the pupil plane. Adaptive optics compensation is applied using a tip-tilt mirror and 37 channel membrane mirror and controlled using a single desktop computer. The performance of the adaptive optics system in real turbulence is compared with the performance of the system in a controlled laboratory environment, where turbulence is generated using a liquid crystal spatial light modulator.
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Ruth Mackey, Ruth Mackey, Chris Dainty, Chris Dainty, } "Adaptive optics compensation over a 3 km near horizontal path", Proc. SPIE 7108, Optics in Atmospheric Propagation and Adaptive Systems XI, 71080I (9 October 2008); doi: 10.1117/12.800172; https://doi.org/10.1117/12.800172

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