LASER MATERIAL (SPECTROSCOPY).
Semiannual rept. no. 1, 15 Dec 64-15 Jun 65.
STANFORD UNIV CALIF MICROWAVE LAB
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The line structure of the photoluminescence of ZnSTb, ZnSNd, ZnSTm and ZnSDy has been studied under various preparative conditions. There is a strong tendency for rare earth pairing with other lattice defects in the presence of excess S. This pairing is manifested by the appearance of new emission and excitation bands. Of the many distinct sites for the rare earth ion, one seems to stand out as most important in electroluminescence although it gives only a minor contribution to the photoluminescence. Using a variety of luminescent phenomena, we are able to count at least four distinct sites for trivalent rare earth ions in ZnS and there is strong evidence that more exist. Preparation of CdSNd has been achieved so that reasonably strong Nd3 emission is obtained. A multiplicity of Nd3 sites is evident. Emission of CdSEr has also been observed. Tunnel injecting contacts have been formed on slices of a single crystal of CdSNd. The belowthreshold oscillation spectral width is derived. The above-threshold spectral width due to phase fluctuations in the oscillator output is given. The above-threshold spectral width due to amplitude fluctuations the AM contribution to the spectral width is given. A practical NdYAG CW laser system has been designed and built. An aluminized glass, cylincrical cavity was used, and a linear tungsten filament, ASA-DXN 1000 watt lamp was used as an optical pump. The laser threshold was between 900 and 1000 watts. Author