OPTICAL PUMPS FOR LASERS - PHASE II.
Quarterly progress rept. no. 2, 1 Jul-30 Sep 66,
WESTINGHOUSE RESEARCH LABS PITTSBURGH PA
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A large number of sodium additive lamps were made and tested at the Lamp Division. Tests include electrical and spectral characteristics as well as some life testing. Data on three Na-Hg lamps in sapphire envelopes, three Na-Hg lamps in PCA envelopes, and eleven NaI-Hg lamps in quartz envelopes are included. The spherical head for coupling energy from the lamp to the rod is analyzed in Appendix A and this head will be used for the duration of this contract. The laser rod coatings and polish are discussed. High resolution spectra of the emission of the sodium additive lamp were taken and compared with the same spectra with an NdYAG spectroscopic sample placed in front of the monochromator entrance slit. Thus, a direct measurement of spectral match could be made. A computer program was developed enabling one to transfer the curve of spectral absorption of NdYAG into the computer so that spectral match calculations could be made if the emission spectrum of a lamp is known. A threshold measurement of an NaI-Hg lamp pumping a 3 x 30 mm NdCrYAG rod was made. Threshold was 332 watts which compares with 540 watts for a tungsten filament lamp operating under similar conditions. Author
- Lasers and Masers