Patent ID: 7139233

Claim:
An optical information processing device comprising: a multi-wavelength light source that emits light of two or more different wavelengths, a filter portion that separates the light emitted from the multi-wavelength light source according to wavelength, and a condensing lens that focuses a plurality of lights separated by the filter portion on the same point for multi-wavelength recording, wherein the multi-wavelength light source comprises a coherent light source that emits a fundamental wave and an optical wavelength conversion element for converting a portion of the fundamental wave emitted from the coherent light source into a higher harmonic wave, and emits light of two different wavelengths, which are the fundamental wave and the higher harmonic wave, and wherein the filter portion is a ring-shaped band aperture filter, and only the fundamental wave penetrates the ring-shaped band aperture portion of the ring-shaped band aperture filter, and the only the higher harmonic wave penetrates the portion other than the ring-shaped band aperture portion of the filter.