Accession Number : AD0746032

Title :   Research and Development of Yttrium Aluminate Lasers.

Descriptive Note : Final rept. 4 Jan 71-3 Jan 72,

Corporate Author : RAYTHEON CO WALTHAM MASS RESEARCH DIV

Personal Author(s) : Weber,Marvin J. ; Bass,Michael

Report Date : JUN 1972

Pagination or Media Count : 124

Abstract : Yttrium orthoaluminate (YA1O3) doped with rare earth ions is investigated for use as an optically-pumped laser material. Two laser ions are studied in detail: neodymium (Nd3+) and holmium (Ho3+) sensitized with erbium and thulium. Measurements of optical absorption and emission spectra, fluorescence kinetics, and stimulated emission corss section are reported. Nd:YA1O3 laser rods are oriented along the three principal crystallographic directions were tested in long-pulse, Q-switched, and CW operation. The laser outputs and efficiencies of Nd:YA1O3 are compared with those obtained from Nd:YAG in the same operating configuration. Ho:YA1O3 laser action is investigated at liquid nitrogen temperatures. Long-pulse and Q-switched laser performance is reported for three different rod orientations. To provide information for predicting laser action and performance of other rare-earth ions in YA1O3, experiments and calculations of radiative transitions probabilities and of nonradiative decay by multiphonon emissions are presented. (Author)

Descriptors :   (*LASERS, YTTRIUM COMPOUNDS), (*INFRARED LASERS, INFRARED OPTICAL MATERIALS), ALUMINATES, DOPING, NEODYMIUM, HOLMIUM, EUROPIUM, ERBIUM, THALLIUM, ATOMIC ENERGY LEVELS, ELECTRON TRANSITIONS, OPTICAL PUMPING, TEST METHODS, PERFORMANCE(ENGINEERING)

Subject Categories : Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE