| 摘要 |
An optical wavelength converter that converts the wavelength of the fundamental wave emitted from a fundamental wave light source by causing the fundamental wave to enter a non-linear optical material. The converter has a filter that absorbs only one of two wavelength-converted waves which is emitted from the non-linear optical material in directions opposite to each other. In the converter, light transmission end faces of an element interposed between the filter and the non-linear are covered with an antireflection coating. Alternatively, instead of the filter, the converter has a reflecting optical element which reflects only one of two wavelength-converted waves which are emitted from the non-linear optical material in directions opposite to each other, and which causes the reflected wavelength-converted wave to travel along an optical path which does not return to the non-linear optical material. In this construction, the light transmission end faces of the element interposed between the filter and the non-linear are also covered with an antireflection coating with respect to the wavelength-converted waves. Thus, variations in an output of the wavelength-converted wave resulting from variations in the wavelength of the fundamental wave are prevented.
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