| 摘要 |
The present invention provides an optical mirror and an optical device in which the mirror is capable of reflecting a light beam having a plurality of wavelengths with the phase matching condition required for nonlinear optical materials being satisfied, so that a decrease in efficiency due to the phase difference does not generate even if harmonic generation, optical mixing or the like is performed, thereby improving conversion efficiency. The optical mirror includes a plurality of reflection films, e.g., multilayer films 2 and 3, formed on one surface of a transparent substrate, each of which films corresponds to each wavelength of a light beam having a plurality of wavelengths to reflect selectively one of said plurality of wavelengths, wherein a phase difference adjusting layer 4 is formed between the two reflection films 2 and 3, reflecting light beams having different wavelengths. The adjusting layer eliminates the phase difference between a phase of the light beam reflected by the 2 or 3 of the reflection films and a phase of the light beam reflected by the other 3 or 2 of the reflection films. This optical mirror can be suitably applied to second harmonic generation, optical mixing, optical parametric generation and the like because it is capable of reflecting with the phase matching condition required for the nonlinear optical materials being satisfied and has high conversion efficiency.
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