WAVELENGTH CONVERSION LASER DEVICE AND LASER PROCESSING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a wavelength conversion laser device which can generate wavelength conversion pulse laser beam of high pulse energy stably for a long time without damaging an optical element and provide a laser processing device which carries out higher wavelength conversion highly effectively and enables rapid processing. SOLUTION: A Q switch element 2, a laser active medium 4, a laser active medium excitation source device 3 which excites the laser active medium 4 in a shorter time than the interval of pulse of the Q switch element 2 and a wavelength conversion crystal 65 which converts basic wave pulse laser beam generated based on energy accumulated in the laser active medium 4 by excitation and Q switching of the Q switch element 2 to high harmonic laser beam 8 are provided.