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HUGHES RESEARCH LABS MALIBU CA
A preliminary determination of the wavelength of the transitions from the excited 2EE level to the ground state levels 4A2 12 and 4A2 32 was made in stimulated emission and fluorescence at 4.2 and 80 K i connection with the use of the ruby laser as an optical pump for obtaining inversion in the ground state of ruby. An analysis of the microwave cavity suitable for this experiment has been made. The grow h of single crystals of chromium-doped yttria and other refractory crystals for millimeter maser applications is continuing. As a prelude to further experimental work, available spectroscopic data on emerald have been analyzed to obtain the characteristics of several modes of maser operation at 35 kmc. A theoretical study of the propagation of a pulse of very intense radiation in an absorbing medium has been initiated. Author
Quarterly rept. no. 2, 1 Oct-31 Dec 61.