Rare-Earth Doped Apatite Laser Materials
Semi-annual rept. no. 1, 19 Sep 1969-19 Mar 1970
WESTINGHOUSE RESEARCH LABS PITTSBURGH PA
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The report describes the results of the first phase of a program to evaluate the merits of certain members of the mineral family apatite as hosts for the active laser ion holmium. Of the several silicate oxy-apatites SOAP studied, preliminary crystal growth and spectroscopic measurements indicated that YSOAP, CaY4SiO43O, was the most promising laser host. An initial sensitized host composition, believed near optimum for laser action, was derived from spectroscopic measurements on polycrystalline melt samples. This composition, CaY2.27Er1.5Tm.13Ho.1SiO43O forms the starting point for growth of laser quality crystals. A low temperature, liquid nitrogen-cooled laser testing has been designed and built which is suitable for long pulse, CW, and Q- switched laser operation. The first YSOAP rod grown and tested in this system lased at 77K with a threshold of 30 joules.
- Lasers and Masers