Wavelength-selective phase grating type optical low-pass filter

Details Wavelength-selective phase grating type optical low-pass filter Wavelength-selective phase grating type optical low-pass filter

1993-08-04

1995-07-18

Gonzalez, Frank

Optical: systems and elements

Diffraction

From grating

359574, G02B 518

Patent

active

054347092

ABSTRACT:
In a wavelength-selective phase-grating type optical low-pass filter including at least a pair of adjacent first and second transparent layers, there is provided at least one adhesive layer through which a pair of adjacent first and second transparent layers stacked on each other in a phase grating form for generating a phase difference distribution on the boundary surface between the pair of adjacent first and second transparent layers. The optical low-pass filter satisfies the following conditions under a condition of 470 nm<.lambda.<580 nm: (a) No (.lambda.)=Ni (.lambda.), (b) .nu.d1<.nu.d2 or .nu.d1>.nu.d2, and (c) 0.9< Np(.lambda.) / No(.lambda.)< 1.1, where .lambda. is a wavelength of light passing through the optical low-pass filter, No (.lambda.) and Ni (.lambda.) are refractive indexes of the first and second transparent layers, respectively, at the wavelength .lambda., .nu.d1 and .nu.d2 are Abbe's numbers of the first and second transparent layers, respectively, No(.lambda.) is a refractive index of the adhesive layer at the wavelength .lambda., Np(.lambda.) is a refractive index of either one of the first and second transparent layers at the wavelength .lambda., thereby obtaining such low-pass effects as preventing decrease of an MTF value of the wavelength band of green.

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