High-Efficiency, Single-Frequency Laser and Modulator Study
Semiannual technical rept. 1 Sep 1970-31 Mar 1971
LOCKHEED MISSILES AND SPACE CO INC PALO ALTO CA PALO ALTO RESEARCH LAB
Pagination or Media Count:
Theoretical and experimental studies on 1 mode filters for single- frequency NdYAG lasers, 2 wide-bandwidth optical modulators, and 3 laser communication systems and components are reported. Stable single-frequency output power of 0.2 W is obtained from a NdYAG laser by using a combination of tilted etalon and a thin metallic film in the laser cavity. Detailed analyses have been made to reduce the insertion loss of mode filters to an absolute minimum so that efficiency can be increased. The electrooptic modulator uses a microwave interdigital filter structure and has a 1.2-GHz bandwidth. A new circuit design aimed at increasing modulation depth for a given rf power has been obtained. Theory indicates that the interferometric mode of modulation should increase efficiency over the birefringence mode good experimental agreement has been obtained. Study of optical crystals has been initiated no optical damage or beam distortion of LiNbO3 was observed under continuous radiation of 14 kWsq. cm green light when the crystal was at 180C. Several laser communication system concepts and modulation formats have been selected for study. An annotated bibliography of these systems has been published.
- Lasers and Masers
- Non-Radio Communications