| 摘要 |
PROBLEM TO BE SOLVED: To provide a short wavelength light source capable of converting a fundamental wave into a high-output second harmonic with high efficiency. SOLUTION: A short wavelength light source is provided with a fundamental wave light source 1 for generating a fundamental wave, and a plurality of wavelength conversion elements 2, 3 made of nonlinear optical crystals having periodic polarization-inversion structures 2a and 3a and adapted to convert a part of the fundamental wave into a second harmonic, and the nonlinear optical crystals of the plurality of wavelength conversion elements 2 and 3 are different in material or composition. By converting the fundamental wave from the fundamental wave light source 1 by the plurality of wavelength conversion elements 2 and 3, the generation of a thermal lens effect caused by light absorption can be suppressed to improve a high output resistance. COPYRIGHT: (C)2009,JPO&INPIT
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