| 摘要 |
This invention provides an integrated optical device, which is used in an optical pickup apparatus that receives light reflected by an optical medium, is provided with a grating 5 that creates both guided light and transmitted light from the reflected light and that is layered with a light guide that transmits the guided light; and wherein the grating 5 is provided with a first optimized device that is optimized for a first wavelength of said reflected light; a second optimized device that is optimized to a wavelength that is longer than the first wavelength of the reflected light; and a third optimized device that is optimized to a wavelength that is shorter than the first wavelength of the reflected light.
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