Lithium Iodate Parametric Oscillator.
Final rept. Nov 73-May 75,
GTE SYLVANIA INC MOUNTAIN VIEW CALIF ELECTRO-OPTICS ORGANIZATION
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This report summarizes the results of a fifteen-month program whose goal is to study the potential of lithium iodate as an infrared optical parametric oscillator OPO material. Since lithium iodate is transparent further into the infrared than lithium niobate, a major goal of this program has been to push kHz-pulse-repetition-rate OPO outputs beyond the 3.7 micrometers previously obtained using lithium niobate. Parametric oscillation was successfully achieved in lithium iodate on this program with average output powers of 530 mW obtained in the 1.9 to 2.4 micrometer range, 50 mW in the 3.2 to 3.8 micrometer range, 5 mW in the 3.8 to 4.1 micrometer range, and up to 1 mW obtained in the 4.4 to 5.1 micrometer range. Rotation tuning was used to tune the LiIO3 and LiNbO3 OPO performance. In addition, OPO threshold expressions were derived that separate the effects of crystal idler absorption, signal absorption, and OPO mirror reflectivities.
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