Effects of Turbulence Instabilities on Laser Propagation (Phase 2)
Final rept. Apr-15 Aug 1973
RCA LABS PRINCETON NJ
Pagination or Media Count:
The report on the behavior of laser beams in turbulent air extends results summarized in a previous report, AD-763 109. It is shown that amplitude scintillation is unimportant in focused beams and is dominant in collimated and diverging beams. The limitations of an existing numerical procedure for computing these are investigated. Intermittency of turbulence is redefined in terms of large-scale variations in the refractive-index structure constant and the dependence upon averaging time is determined. It is concluded that intermittency is essentially an extra randomness during operation of the laser for short periods of several minutes or less. Significant fluctuation rates are defined for angle of arrival, phase, and amplitude. They differ greatly.