1 March 1974 Laser Internal Aerodynamics And Beam Quality
Author Affiliations +
Proceedings Volume 0041, Developments in Laser Technology II; (1974); doi: 10.1117/12.953836
Event: Annual Technical Symposium, 1973, San Diego, United States
Abstract
Heat release in a laser with subsonic or supersonic flow of the lasing medium causes variation in gas density. Variations in gas density result in phase differences at the exit aperture of the laser beam. Beam quality is degraded. Using the linearized solutions for a line source of heat in subsonic, planar flow, equations are derived for the density perturbation Lip p. Lasers having subsonic flow in the cavity include electroaerodynamic lasers. The equations permit assessment of Mach number effects and wall shape. As Mach number increases, the influence of the heat source wakes becomes less important. A wall shape equivalent to operation in a flow of infinite extent gives smaller Lp/p than par-allel walls. To apply the aforementioned equations, it is necessary to know the heat release function, h(x,y). A simplified vibra-tional relaxation model is developed and coupled with Joule heating to arrive at estimates for h(x,y). The model predicts populations with and without laser power extraction.
© (1974) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
O. Biblarz, A. E. Fuhs, "Laser Internal Aerodynamics And Beam Quality", Proc. SPIE 0041, Developments in Laser Technology II, (1 March 1974); doi: 10.1117/12.953836; https://doi.org/10.1117/12.953836
PROCEEDINGS
12 PAGES


SHARE
KEYWORDS
Laser resonators

Molecules

Gas lasers

Carbon dioxide

Aerodynamics

Oscillators

Information operations

RELATED CONTENT


Back to Top