Abstract
The laser emission of YAlO3:Er at 1.663 mu m was investigated in order to find the best conditions with respect to crystal orientation, Er concentration, and output coupling. Using ten different laser rods the following optimised data have been obtained: b axis laser rod (Pnma notation), 1.25% Er doping, and 85% output mirror reflectivity. The temperature dependence of laser threshold and efficiency was measured between -50 degrees C and 50 degrees C. At room temperature the authors obtained 34 J threshold energy and 0.07% slope efficiency. In addition laser emission of LiYF4:Ho, Er, Tm at 2.065 mu m was investigated. The slope efficiency was 0.22%. Laser emission of YAlO3:Ho, Er, Tm at 2.12 mu m is briefly mentioned.
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