Patent ID: 9188834
Filing Date: 2015-11-17
Classification: G02F,H01S

Abstract:
1. A single wavelength conversion crystal which performs both of a first wavelength conversion and a second wavelength conversion, comprising: a first optical path which can satisfy at a temperature T an angular phase-matching condition which is required for the first wavelength conversion to convert first wavelength light into second wavelength light; and a second optical path which can satisfy at the same temperature T an angular phase-matching condition which is required for the second wavelength conversion to convert the second wavelength light into third wavelength light, wherein the light is guided from the first optical path to the second optical path, a polarization direction of light suitable for the second wavelength conversion is selected due to reflection caused by two reflective faces having different orientations, and normal directions of said reflective faces are set so that a polarization direction of the second wavelength light generated by the first wavelength conversion on a propagation path between said reflective faces formed on the single wavelength conversion crystal is polarized to one of an ordinary ray and an extraordinary ray of the single wavelength conversion crystal.