WAVELENGTH CONVERSION ELEMENT FOR PSEUDO-PHASE MATCHING, MANUFACTURING METHOD THEREFOR, AND MEDICAL LASER DEVICE USING THE ELEMENT

摘要

PROBLEM TO BE SOLVED: To practically enable wavelength sensing to ultraviolet light specifically by attaining improvement of twin control and twin growth at a high aspect ratio in a quartz crystal.

SOLUTION: A pseudo-phase matching sensing element makes a base material of the quartz crystal cyclically induce the twin by applying stress. The boundary face of the twin is in a face including the Y axis of the quartz, and the cyclic twin is formed in the Z-axis direction of the quartz crystal. When an angle making the Z-axis direction of the quartz crystal and an incident vector of fundamental wave light is α, α is within 30 degrees. When the angle of stress application direction to the Z-axis of the quartz crystal is θ, stress is applied at 60 degrees<θ<90 degrees.

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