Wavelength conversion laser device

摘要

A wavelength conversion laser device (10) includes a solid-state laser element (12) having a waveguide structure including a laser medium (121) that amplifies laser beams by providing a gain generated due to absorption of pump light to the laser beams and outputs a fundamental wave, and a wavelength conversion element (13) having a waveguide structure including a nonlinear optical material (131) that converts a part of a fundamental wave output from the solid-state laser element (12) to a second harmonic, to resonate the fundamental wave by an optical resonator structure including the solid-state laser element (12) and the wavelength conversion element (13) and outputs a second harmonic from the wavelength conversion element (13). The solid-state laser element (12) outputs a linearly polarized fundamental wave, and differentiates a polarization state of a fundamental wave having passed through the wavelength conversion element (13) and entering into the solid-state laser element (12) from linear polarization output from the solid-state laser element (12), so that wavelength conversion efficiency of the wavelength conversion element is not decreased in a peak wavelength of a gain band.