EXTERNAL RESONANCE TYPE SEMICONDUCTOR LASER

摘要

PROBLEM TO BE SOLVED: To carry out wavelength conversion for a semiconductor laser beam effectively with a simple low-cost configuration. SOLUTION: The external resonance type laser includes a laser oscillator 1 for casting a laser beam with a prescribed wavelength and an external resonator for wavelength conversion of a laser beam cast from the laser oscillator 1. A photopolymer volume hologram 3 and a non-linear optical crystal 5 are provided in the resonator. The laser beam cast from the oscillator 1 is diffracted by the photopolymer volume hologram and cast into the non-linear optical crystal 5. At the same time, the laser beam converted in wavelength is transmitted selectively through the photopolymer volume hologram and cast outside.