Manufacturing method for QPM wavelength converter elements, QPM wavelength converter element, and medical laser apparatus using it

摘要

A manufacturing method for quasi phase matching (QPM) wavelength converter elements using crystal quartz as a base material in which twins are periodically induced, comprises a step of periodically inducing the twins by applying a stress onto a crystal quartz substrate as the base material so that an angle theta of a direction in which the stress is applied relative to a Z axis of the crystal quartz is 60°<theta<90°.