LASER DEVICES EXPLORATORY INVESTIGATION.
Interim Engineering Rept. no. 5, 1 May-31 Jul 64,
HUGHES RESEARCH LABS MALIBU CALIF
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Quarter-wave plates for a longitudinal mode selector were completed see AD-600 267. Evaluation of a liquidnitrogen-cooled pumping configuration for ruby has shown that the over-all efficiency is lower than for a room-temperature system despite a 40 lowering of threshold. Therefore, attention is given to the further improvement of noncryogenic systems, including the effects of multiple ellipse cavities, improved optical finish, and cooling to 0C. The efficiencies of several useful linear flash lamps were measured. Equipment for the growth of yttrium oxide was modified and is ready for operation. Doped lanthanum fluoride of excellent optical quality was prepared and used for optical and microwave studies. Improvements in the mode control of giant pulse lasers have resulted in significant changes in the anti-Stokes emission in benzene. Thresholds and conversion efficiencies for the production of stimulated Raman scattering were measured, and the production of damage in transparent dielectric materials was investigated. Author