OPTICAL WAVEGUIDE, OPTICAL WAVELENGTH CONVERSION ELEMENT AND METHOD FOR MANUFACTURING THE SAME AS WELL AS SHORT WAVELENGTH GENERATOR, OPTICAL INFORMATION PROCESSOR, COHERENT LIGHT GENERATOR AND OPTICAL SYSTEM USING THE SAME

摘要

PROBLEM TO BE SOLVED: To make output stable by realizing the higher efficiency and light damage resistant strength of an optical wavelength conversion element of a waveguide type. ;SOLUTION: The optical waveguide has a nonlinear optical crystal, a first ion exchange region formed near the surface of this nonlinear optical crystal and a second ion exchange region formed near the surface of the first ion exchange region. The second ion exchange region has a refractive index higher than the refractive index of the first ion exchange region and the refractive index distribution of the second ion exchange region has a step-like graded shape.;COPYRIGHT: (C)2001,JPO