Solid-State Lasers for Bathymetry and Communications. Studies of Four Rare-Earth Materials.
Final rept. Oct 79-Sep 81,
NAVAL AIR DEVELOPMENT CENTER WARMINSTER PA SENSORS AND AVIONICS TECHNOLOGY DIRECTORATE
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Lasing transitions of four rare-earth ions in crystalline hosts were investigated for use in laser bathymetry and strategic communications systems. Transitions in NdYAG Li Ho F4 were studied theoretically and experimentally from 210K to 273K. At 210K the Nd transition produced 42 mj of energy when pumped by a krypton lamp with 32 joules of energy. The stimulated emission cross-section of the transition in Li Ho F4 was found to be 4 to the -20 power sq cm. The lasing threshold of a 5 mm x 75 mm Hi Ho F4 rod exceeded 50 joules at 210K. Lasing was not observed in this material. The cross-section of the 5D4 yields 7F5 transition 545 mm in Li Tb F4 was measured as .16 x 10 to the -20th power sq. cm at 77K. The cross-section of the 4S32 yields 152 transition 550 nm in Er Li YF4 was measured as 5 x 10 to the -20th power sq cm at 77K. A first-order analysis of the efficiency of refrigerated solid-state lasers is presented. The frequency-doubled NdYAG at 532 nm appears more efficient than any of the transitions studied in this work.
- Lasers and Masers
- Non-Radio Communications