Accession Number : AD0664487

Title :   A THEORY OF HIGH FREQUENCY LASER-INDUCED INSTABILITIES IN GASES.

Descriptive Note : Research paper,

Corporate Author : INSTITUTE FOR DEFENSE ANALYSES ARLINGTON VA SCIENCE AND TECHNOLOGY DIV

Personal Author(s) : Livingston,Peter M.

Report Date : DEC 1967

Pagination or Media Count : 28

Abstract : A theory is presented which treats the problem of high frequency instabilities generated in a gas by laser radiation. Transport processes enhanced by sound pumping of low-lying rotational and vibrational states contribute to a strong high frequency dispersion in carbon dioxide and air. For a light-absorption power-product (alpha P)Mw/cu cm, the gain lengths of the most unstable modes in CO2 and air are L-CO2=0.33(alpha P) to the -1/2 power, L-air = 0.1(alpha P) to the -1/2 power. The result shown for air is several orders of magnitude smaller than previously reported. (Author)

Descriptors :   (*COHERENT RADIATION, INTERACTIONS), (*LASERS, SOUND), CARBON DIOXIDE, AIR, MOLECULAR ENERGY LEVELS, EXCITATION, OPTICAL PUMPING, THEORY

Subject Categories : Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE