LASER DEVICES EXPLORATORY INVESTIGATION.
Interim scientific rept. no. 3, 1 Nov 6331 Jan 64.
HUGHES RESEARCH LABS MALIBU CALIF
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Pinhole mode selectors have been sucessfully analyzed by a theory which does not depend on the assumption of differences in propagation angle between different transverse modes. The frequency spacing between transverse modes was determined to be 160 40 Mc in a 1-in. ruby, agreeing with effectively-curved-reflector resonator theory. Regular spiking in a Hughes Model 200 laser appears to be correlated with simultaneous excitation of many transverse modes. Under construction are an elliptical cavity and dewar for cw laser operation which will use as coolant liquid nitrogen precooled below its boiling point. Experiments intended to decrease the emission line width of chromium in spinel by varying the host composition have not yet been successful. Future work on lanthanum trifluoride preparation will utilize HF atmospheres. The optical spectroscopy of Pr3 -doped LaF3 was studied the microwave spectrum of LaF3 doped with terbium indicated the presence of Tb4. Author