| 摘要 |
A wavelength conversion optical device is provided with a fundamental wave light source ( 301 ) which outputs a fundamental wave (L 11 ) including a P polarized light and an S polarized light that are perpendicular to each other, and two wavelength conversion mechanisms ( 303 a, 303 b) each having a polarization inversion formation part which wavelength-converts the fundamental wave (L 11 ) to generate harmonic waves, and the first-stage wavelength conversion mechanism ( 303 a) performs wavelength conversion of the P polarized light of the fundamental wave (L 11 ) while the second-stage wavelength conversion mechanism ( 303 b) performs wavelength conversion of the S polarized light of the fundamental wave (L 11 ), whereby absorption of a second harmonic wave (green light) due to a third harmonic wave (ultraviolet light) is reduced, and stability and reliability of the wavelength-converted light output are enhanced, thereby providing a wavelength conversion optical device which can output a wavelength-converted light capable of improving the image quality of the displayed image.
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