Accession Number : AD0907545

Title :   GaAlAs Diode-Pumped Nd:YAG Laser.

Descriptive Note : Final rept. 1 Jun 71-1 Jun 72,

Corporate Author : TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP

Personal Author(s) : Allen, Raymond B. ; Dierschke, Eugene G.

Report Date : AUG 1972

Pagination or Media Count : 59

Abstract : This report is a summary of the major accomplishments and conclusions of a 12-month program to develop a laboratory model of a room-temperature GaAlAs diode-pumped Nd:YAG laser. The major objective of the program was to investigate the CW TEM sub 00 performance of a diode-pumped laser operating in a temperature range compatible with practical applications in space. The laser developed on this program consisted of a room-temperature 120-device linear array of GaAlAs light-emitting diodes, coupled via a gold-coated, hemielliptical cylindrical reflector to a 1.5-mm diameter by 7.5-cm-long Nd:YAG laser rod. Temperature of the rod could be varied by thermoelectric cooling modules from room temperature to -22 C. The laser produced a CW TEM sub 00 output power of slightly over 80 mW for a laser rod temperature of -22 C. This represents the highest level of CW TEM sub 00 power reported to date for a diode-pumped laser. Due to cooling with thermoelectric modules, an optimum rod temperature exists where overall laser efficiency is maximum. At the optimum rod temperature of -13 C, a maximum laser efficiency of 0.089 percent was achieved. At this temperature, a CW TEM sub 00 output power of 64 mW was obtained for 72 watts of total electrical input power (48 watts for the diode array plus 24 watts for the thermoelectric coolers). TEM sub 00 operation was substantiated by beam profile scans and by measurements of beam divergence.

Descriptors :   *OPTICAL PUMPING), (*INFRARED LASERS, GALLIUM COMPOUNDS, ALUMINUM COMPOUNDS, ARSENIDES, YTTRIUM, GARNET, LASERS, SEMICONDUCTOR DIODES, PERFORMANCE(ENGINEERING), TEMPERATURE, THERMOELECTRICITY, COOLING.

Subject Categories : Lasers and Masers
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE