Accession Number : AD0778958

Title :   Transient Behavior of Transverse Modes in High-Power Pulsed Lasers.

Descriptive Note : Final rept. 1 Mar 71-31 Dec 73,

Corporate Author : UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES ELECTRONIC SCIENCES LAB

Personal Author(s) : DeShazer,Larry G.

Report Date : 25 FEB 1974

Pagination or Media Count : 16

Abstract : Theoretical and experimental studies of the transient behavior of transverse modes in high-power Q-switched laser oscillators were performed. A computer analysis determined the transverse patterns for pulsed gain saturated lasers having Fresnel numbers up to 10, and the transverse intensity profiles of a passively Q-switched ruby laser oscillator were measured for several Fresnel numbers. The theoretical calculations predicted the experimental performance very well. A criterion for single-mode operation of passively Q-switched high-gain laser oscillators was determined empirically. The characteristics of the saturable absorber used as a Q-switch were shown to have only minor effect on the transient mode behavior. Analytic solutions of the diffraction of truncated Gaussian beams were developed to provide guidance for the computer calculations. (Author)

Descriptors :   *Ruby lasers, High power, Gain, Q switching, Transients, Operation

Subject Categories : Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE