WAVELENGTH CONVERSION LASER DEVICE

PROBLEM TO BE SOLVED: To prevent the occurrence of a state in which intensity of linearly polarized light, being desired output light, is not properly controlled with a wavelength of fundamental light incident on a wavelength conversion element. SOLUTION: When the fundamental light emitted from an optical resonator consisting of a semiconductor amplifying element 1 and an optical fiber 3 is made incident on the wavelength conversion element 5, the wavelength conversion element 5 emits second harmonic light thereof. A polarizer 52 transmits only an extraordinary ray component of the second harmonic light. A beam splitter 56 makes a part of the extraordinary ray component passed through the polarizer 52 branch and a photometric element 57 measures intensity of the branched extraordinary ray component. A laser control part 60 drives the semiconductor amplifying element 1 based on a signal Sd from the photometric element 57. Even when harmonic light containing extraordinary and ordinary ray components is emitted from the wavelength conversion element, output intensity of the extraordinary ray component is adequately controlled. COPYRIGHT: (C)2005,JPO&NCIPI