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18 September 2018 A multi-aperture laser transmissometer for detailed characterization of laser propagation over long paths through the turbulent atmosphere
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Abstract
We present an experimental evaluation of a multi-aperture laser transmissometer system which profiles long-term laser beam statistics over long paths. While the system was originally designed to measure the aerosol extinction rate, the beam profiling capabilities of the transmissometer system also allows experimental observations of Gaussian beam statistics in weak and strong turbulence. Additionally, measurement of long-term beam spread at the receiver allows the system to estimate a path-averaged Cn2, including in strong turbulence regimes where scintillometers experience saturation effects. Additionally, a phase-frequency correlation technique for synchronizing with transmitter ON/OFF modulation in the presence of background ambient light is presented. In application, our ruggedized and weather resistant laser transmissometer system has significant advantages for the measurement and study of aerosol concentration, absorption, scattering, and turbulence properties over multi-kilometer paths, which are crucial for directed energy systems, ground-level free-space optical communication systems, environmental monitoring, and weather forecasting.
Conference Presentation
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Daniel A. Paulson, Chensheng Wu, John R. Rzasa, Jonathan Ko, Miranda Van Iersel, Joseph Coffaro, Christopher Smith, Robert Crabbs, and Christopher C. Davis "A multi-aperture laser transmissometer for detailed characterization of laser propagation over long paths through the turbulent atmosphere", Proc. SPIE 10770, Laser Communication and Propagation through the Atmosphere and Oceans VII, 107700J (18 September 2018); doi: 10.1117/12.2322586; https://doi.org/10.1117/12.2322586
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