Phase conjugation for improvement of solid state and excimer lasers

摘要

Abstract: To improve the beam quality of industrial solid state and excimer lasers, self-pumped phase conjugating mirrors based on stimulated Brillouin scattering (SBS) were applied in different oscillator and master oscillator power amplifier systems. Pulsed Nd-lasers for industrial applications with up to 500 W average output power at 1 micron wavelength and high beam quality were realized. Due to phase conjugation the beam diameter and divergence do not depend on the average output power. In the ultraviolet range, a commercial XeCl laser from Lambda Physik was equipped with an SBS- mirror resulting in a self starting oscillator with phase conjugation at a wavelength of 308 nm. The beam profile could be converted from rectangular to near gaussian and the brightness could be improved. As an alternative to widely used SBS-materials like liquids and gases we developed a new kinds of self-pumped SBS-mirror based on multimode quartz fibers. These exhibit lower SBS thresholds and therefore continuously pumped Q-switched laser systems with SBS-mirror can be realized.!6