Microlaser Array Development.
Final rept. 8 Jul 92-15 Nov 93,
TRW SPACE AND TECHNOLOGY GROUP REDONDO BEACH CA
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This report describes the design, construction and characterization of a 2 dimensional micro laser array. The micro laser array consists of a monolithic pump array, microlenses, and a solid state gain module. Passive q-switching on a single element was also demonstrated on this program. The array produced 0.35 Watts of average power with an optical efficiency of 5.8. 70 elements out of the 108 total elements were lasing and the best elements were lasing at 2 microJ energy per pulse and with 12 optical efficiency. The diode array pump was a TRW built, high power surface emitting array, HPSEA, device cooled by a TRW built micro channel heat exchanger. The gain material was 400 micron thick NdYVO4 and the output wavelength was 1.064 microns. The far field divergence of the entire array was 10.4 mrad and 3.5 mrad for a single element. Each of the elements in the array operated single longitudinal and single transverse mode. The frequency variation over the entire array was 43 GHz and was due to individual variations in cavity lengths.
- Lasers and Masers