Experimental Studies of Laser Beam Degradation by Turbulent Shear Layers
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH
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The degradation of a laser beam by turbulent shear layers has been systematically and experimentally studied with variation in parameters. The near-field measurement results showed that the growth rates of the shear layers decreased drastically with increase in Mach number and were dependent, to a lesser extent, on the density ratio. The optical far-field measurements results showed that the Strehl ratio decreased with increase in refractive index change across the shear layers, with increase in growth, with increase in downstream distance of the nozzle exit, and with increase in beam diameter.