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Atmospheric Turbulence Simulation Using Liquid Crystal Spatial Light Modulators (in English)
James D Phillips (Author)
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Atmospheric Turbulence Simulation Using Liquid Crystal Spatial Light Modulators (in English) - James D Phillips
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Synopsis "Atmospheric Turbulence Simulation Using Liquid Crystal Spatial Light Modulators (in English)"
Laser systems are finding a home in many military applications - such as Space Situational Awareness, imaging and weapons systems. With an increasing focus on programs that entail atmospheric propagations, there is a need for a cost effective method of performing proof-of-concept demonstrations. The use of one SLM (single phase screen) to model atmospheric effects has been investigated previously with promising results. However, some effects cannot be captured with asingle SLM. This paper focuses on the addition of a second SLM and quantifying the results. Multiple screens will allowthe user to independently control the Fried parameter, the isoplanatic angle, and Rytov Variance. The research is comprised of simulation and experiment. The simulation demonstrates the ability to accurately model atmospheric effectswith two phase screens. Based on the simulation, a hardware implementation was tested in the lab. This thesis describes the experimental set-up and results based on measurement of phase and intensity of the propagated field. It was noted that while analytic results are replicated in simulation, similar results in the lab were difficult to achieve.
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