THIRD HARMONIC ULTRAVIOLET LASER OF SEMICONDUCTOR DOUBLE END FACE PUMPING

摘要

A third harmonic ultraviolet laser of semiconductor double end face pumping comprises a semiconductor pumping module (1), an optical coupling system (3), fundamental gain-medium crystals (5,6), a second harmonic nonlinear crystal (10), a third harmonic nonlinear crystal (13), a wave plate (11), a modulation device (7), laser resonant cavity mirrors (4,9,14), and an ultraviolet laser reflecting mirror (12). The pump-light emitted by the semiconductor pumping module is transmitted into the optical coupling system, then collimated and focused by the optical coupling system, and incidents directly on the end faces of the fundamental gain-medium crystals. The light emitted by the excited fundamental gain-medium crystals forms fundamental frequency light beam via mode selection of the laser resonant cavity mirrors, and the modulated laser beam is obtained by the modulation function of the modulation device. The modulated fundamental frequency laser beam is converted to green laser beam via the second harmonic nonlinear crystal and is polarized by the wave plate. The fundamental frequency laser beam and green laser beam which are the same polarization are incident into the third harmonic nonlinear crystal, thereby performing sum-frequency and generating third harmonic ultraviolet laserbeam.