Accession Number : AD0722337

Title :   New Monte Carlo Method and Review of Present Methods For Calculating the Characteristics of Excitation Geometries for Solid-State Lasers.

Descriptive Note : Research paper,

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

Personal Author(s) : Seppi,E. J.

Report Date : DEC 1970

Pagination or Media Count : 78

Abstract : Excitation geometries which have been used to transfer pumping radiation from the source to the active medium of lasers are reviewed and literature cited. Methods of analysis and simplifying assumptions used to calculate the characteristics of excitation geometries are discussed. A three-dimensional Monte Carlo calculation which accounts for interactions that affect the pump light and its distribution in the cavity and active medium of the laser is presented. The calculation accounts for the spectrum, polarization, and intensity distribution of the pump light and the reflection and fraction of the cavity, source, and active medium. The photon trajectories are traced through multiple reflections and refractions by the components of the system until they are absorbed. Absorption in the active medium is based on the absorption coefficient as a function of frequency and on a ground state ion density where account is taken for excitation of active ions to the excited states and for return to the ground state by spontaneous and stimulated emission. Results are presented for various cavity and crystal geometries. (Author)

Descriptors :   (*LASERS, EXCITATION), OPTICAL PUMPING, EFFICIENCY, PHOTONS, DISTRIBUTION THEORY, MONTE CARLO METHOD, REFLECTION, REFRACTION, POLARIZATION, ABSORPTION SPECTRA, COMPUTER PROGRAMS

Subject Categories : Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE