INVESTIGATION OF STIMULATED RAMAN OSCILLATORS AND AMPLIFIERS.
Final technical rept.,
HUGHES AIRCRAFT CO CULVER CITY CALIF AEROSPACE GROUP
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The results of an investigation of several non-linear optical effects are presented. Main emphasis is on the study of stimulated Raman scattering and mode selective techniques for giant pulse lasers. Secondary studies of optical harmonic generation and bleachable dye lasers are also discussed. It is shown that the gain in a diffusely pumped stimulated Raman scattering amplifier behaves according to the theory developed by Hellwarth and that the gain anomaly observed in colinear amplifiers and explained as a consequence of beam trapping of the input beam is, in fact, not present. A study of the mode selective properties of a passive Q-switch reveals that mode selection occurs as a result of the slow buildup of oscillation in a passive Q-switched laser. The character of spatial and temporal amplitude fluctuations in a laser beam is related to the degree of mode selection employed and the effect of these fluctuations on stimulated Raman conversion is given. A discussion is presented of laser action in two polymethene dyes in glycerol solution pumped by a giant pulse ruby. The potential for laser action in these particular dyes was identified in a parallel Hughes program. Author
- Lasers and Masers