Reflection type diffraction grating

Details Reflection type diffraction grating Reflection type diffraction grating

G - Physics

02

B

G02B 5/18 (2006.01)

Patent

CA 2357607

Areflection type diffraction grating according to the present invention has a structure in which a metal film as a first layer with reflectance not lower than 30 % with respect to the wavelength of incident light and a transparent dielectric film as a second layer are laminated successively on the surface of the reflection type diffraction grating. With respect to the wavelength of incident light, the metal film has a refractive index selected to be not higher than 1.5 and an extinction coefficient selected to be not smaller than 6Ø The transparent dielectric film has a refractive index selected to be in a range of from 1.30 to 1.46, both inclusively, with respect to the wavelength of incident light and has an optical film thickness selected to be in a range of from 0.20.lambda. to 0.38.lambda., both inclusively, when .lambda. is the wavelength of incident light.

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