Accession Number : ADA273109


Title :   Effects of Stimulated Raman Scattering on Light Beam Properties During High-Power Laser Beam Long-Path Propagation


Corporate Author : FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT-PATTERSON AFB OH


Personal Author(s) : Lian, Chien ; Zhan, Shui ; Xiaomin, Zhang ; Xiaofeng, Wei ; Xiaodong, Yuan


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a273109.pdf


Report Date : 03 Nov 1993


Pagination or Media Count : 19


Abstract : Beginning from the third-order nonlinear polarization from the stimulation and induction of matter based on the semiclassical theory of stimulated Raman scattering (SRS), a theoretical model of coupling between the phase of a pump (transmission) laser beam and the phase of the Stokes beam intensity is established for the case of stimulated Raman scattering during long-path propagation of a high-power laser. The model clearly explains how the SRS effect influences the beam properties of the pump laser, including the physical regime and effective factors of time-domain properties and space-domain properties (light beam quality). The theoretical analysis is in fairly satisfactory agreement with the experimental results. In the experiments, measurements of time-domain properties were taken of the pump laser beam and the Stokes beam after transmission in a situation with various conversion efficiencies Ns. As shown by the results, under conditions of low-conversion efficiencies, basically the time-domain properties of the pump laser beam are not affected by the SRS effect. But when the conversion efficiency Ns is greater than 5 percent, the pulse duration of the pump laser beam is gradually reduced as Ns is increased. Stimulated raman scattering, Pump laser beam, Stokes beam, Far-field divergency angle.


Descriptors :   *HIGH POWER , *PROPAGATION , *SCATTERING , *LIGHT , *LASER BEAMS , CONVERSION , MODELS , EFFICIENCY , NONLINEAR SYSTEMS , CHINESE LANGUAGE , COUPLINGS , CHINA , TIME DOMAIN , PUMPS , TRANSLATIONS , PULSES , PHASE , FAR FIELD , PATHS , INTENSITY , POLARIZATION , MEASUREMENT , ANGLES


Subject Categories : Lasers and Masers
      Optics


Distribution Statement : APPROVED FOR PUBLIC RELEASE