Development of Self Q-Switching Glass Laser Illuminator Head.
Final rept. 18 Jun 71-31 Mar 72,
AMERICAN OPTICAL CORP SOUTHBRIDGE MASS CENTRAL RESEARCH LAB
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The Research and Development program which resulted in the development of a Nd3 DOPED Self Q-Switching Glass Laser Illuminator Oscillator is described. Research studies undertaken in this program included an evaluation of some new self Q- switching glass compositions, a study of the effects of relatively high input powers on the laser output beamspread and efficiency, and a study of the temperature dependence of the characteristics of the laser self Q- switching train of spikes and efficiency over the temperature range 12 C through 50 C. In another study it was found that the thermal fracture point of untreated self Q- switching glass laser rods is roughly about a factor of 1.7 times less than that for the untreated conventional laser glass of similar composition. The laser illuminator oscillator developed and delivered to Fort Belvoir is described. Included is a description of the highly efficient and flexible imaging type water cooled laser cavity structure. The laser self Q-switching oscillator developed utilizes an 0.8 cm diameter, 61 cm long rod of self Q-switching laser glass. At the train repetition rate of 8 TPS an average output power of about 14 watts is obtained at the laser wavelength of 1.06 microns at the recommended operating point. The slope efficiency above threshold was measured to be 2 and the full beamspread was found to be about 6 degrees at -TPS. A typical train contains 17 smooth Gaussian-type self Q-switching spikes with a minimum time interval of about 12 microseconds between any two successive spikes. Author-PL
- Lasers and Masers