Accession Number : AD0663270

Title :   SATURATION FLUX AND STIMULATED EMISSION CROSS SECTION OF THE CO2 LASER.

Descriptive Note : Research and Development rept. Nov 66-Jul 67,

Corporate Author : NAVAL ELECTRONICS LAB CENTER FOR COMMAND CONTROL AND COMMUNICATIONS SAN DIEGO CALIF

Personal Author(s) : Hotz,D. F. ; Austin,J. W.

Report Date : 11 OCT 1967

Pagination or Media Count : 16

Abstract : Development of a high radiance laser source is a necessary preliminary to study of nonlinear phenomena in the gases of a typical atmosphere. Before an efficient laser power amplifier can be designed, two gain limiting effects must be understood: gain saturation and spectral hole-burning. Gain saturation flux and stimulated emission cross section for the strong laser transition in CO2 were measured. The saturation flux was found to be 22 (+2 or -2) W/sq cm for steady state emission. The cross section was found to agree with theory only after correction for participation of appreciable numbers of rotational levels in the gain process. It was concluded that gain linewidth is homogeneously saturable for typical CO2: N2: He mixtures in which pressure exceeds 10 torr, and that hole-burning will not occur until cw flux levels of the order of 100,000 W/sq cm are achieved. Hole-burning will appear at about 10,000 W/sq cm for Q-pulse amplification. (Author)

Descriptors :   (*GAS LASERS, EMISSIVITY), (*CARBON DIOXIDE, *ELECTRON TRANSITIONS), LINE SPECTRA, PROBABILITY, POWER AMPLIFIERS, GAIN, ATOMIC ENERGY LEVELS

Subject Categories : Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE