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Using the geometrical optics approximation, a theoretical prediction of the de∞ection angle correlation of a laser beam propagating in a hot turbulent jet is found as a functional form of the turbulent spectrum of the refractive index ∞uctuations. By applying the modifled Von Karman model and Tatarskii model, the structure coe-cient of the refractive index and the de∞ection angle correlation of the laser beam are then computed by means of a numerical procedure. Experiments to measure the structure coe-cient are performed. A good agreement between the experimental results obtained and the theoretical predictions demonstrates the validity of the theoretical approach.

progress in electromagnetics research b. pier b

CORRELATIONS OF DEFLECTION ANGLES OF A LASER BEAM IN A HOT TURBULENT JET OF AIR: THEORETICAL DETERMINATION AND EXPERIMENTAL MEASUREMENT OF THE STRUCTURE COEFFICIENT OF REFRACTIVE INDEX FLUCTUATIONS