Accession Number : AD0676001

Title :   SPECTROSCOPIC CONSIDERATIONS OF CHROMIUM DOPED LITHIUM GERMANATE AS A POSSIBLE LASER MATERIAL.

Descriptive Note : Physical science research papers no. 360,

Corporate Author : AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS

Personal Author(s) : Powell,Richard C.

Report Date : JUL 1968

Pagination or Media Count : 51

Abstract : Continuous fluorescence, pulsed fluorescence, and excitation measurements were made on lithium germanate samples containing 0. 038, 0. 12, and 0. 18 percent chromium. The several sharp lines appearing in the fluorescence spectrum are attributed to chromium ions in nonequivalent lattice sites. It appears that these sites are filled randomly as chromium concentration is increased. The temperature dependence of the widths, positions, intensites, and lifetimes were investigated for the two most prominent sets of R lines associated with chromium in nonequivalent sites. These results are interpreted in terms of energy transfer between chromium ions in nonequivalent sites, which is efficient enough at high temperatures to allow thermal equilibrium to be established between the two florescent systems but which predicts pumping of the R system by the R' system at low temperatures. (Author)

Descriptors :   (*LASERS, *OPTICAL MATERIALS), (*LITHIUM COMPOUNDS, FLUORESCENCE), EXCITATION, GERMANIUM COMPOUNDS, DOPING, CHROMIUM, LINE SPECTRA, TEMPERATURE

Subject Categories : Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE