Laser apparatus provided with a wavelength conversion device

摘要

A wavelength conversion device (10) using a nonlinear crystal (12) having the property of deliquescing includes a container (11) in which the nonlinear crystal is disposed, the container being provided with a first opening (15a) through which an incoming light beam to the nonlinear crystal (12) passes and a second opening (15b) through which an outgoing light beam from the nonlinear crystal (12) passes; and dehurnidifying means (30) for holding the nonlinear crystal (12) disposed in the container (11) in an environment of a predetermined humidity.