STIMULATED-EMISSION AND LASER ACTION OF PR3+-DOPED YALO3

Groundstate absorption, fluorescence, excited-state absorption, and stimulated emission of Pr:YAlO3 were measured in dependence on the polarization. The results reflect the anisotropy of the host lattice. Especially the polarized spectra of the stimulated emission fit very well with the laser data of this material. Seven cw laser transitions in the visible spectral range obtained so far in Pr:YAlO3 with argon-ion laser pumping were identified in the spectra of the stimulated emission. In addition, two infrared cw laser transitions were realized. The best results were achieved for the P-3(0) --> F-3(4) laser transition at 746.9 nm with a maximum slope efficiency of 24.6%, a maximum output power of 49.6 mW, and a laser threshold of 25 mW.