Accession Number : AD0887410

Title :   GaAsP Diode Pumped Nd: YAG Laser.

Descriptive Note : Final rept. 23 Feb 70-28 Feb 71,

Corporate Author : TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP

Personal Author(s) : Scalise, Stanley J. ; Allen, Raymond B.

Report Date : 22 APR 1971

Pagination or Media Count : 112

Abstract : The significance of this research and development to the Air Force is the demonstration of diode-pumped laser operation at noncryogenic temperatures. Operation at noncryogenic temperatures is an important requirement in most operational applications of interest. The design fabrication and evaluation of Nd:YAG lasers optically pumped with GaAsP light-emitting diodes at 0C are described. A comparison of close and focused coupling pump geometries is made for both CW and pulsed operation over the temperature range of -20C to +20C. Slope efficiencies as high as 0.35 percent and overall efficiencies of 0.15 percent were obtained with an average diode efficiency of approximately 4 percent. The maximum power output measured at 0C was 270 milliwatts pulsed and 78 milliwatts CW. Laser thresholds occurred for total electrical power inputs as low as 10 to 20 watts. The continuous wave (CW) power levels were lower than expected due to laser rod and diode heating problems. However, the general performance of the laser exceeds that of conventionally pumped lasers operated in the same power regions. Based upon the results of this program, recommendations are made for further development to improve performance. A brief summary of state-of-the-art GaA1As technology is presented. (Author)

Descriptors :   *OPTICAL PUMPING), (*LASERS, PHOTODIODES, GALLIUM ARSENIDES, PHOSPHIDES, FEASIBILITY STUDIES, PERFORMANCE(ENGINEERING), EFFICIENCY.

Subject Categories : Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE