Wavelength-selective phase-grating optical low-pass filter

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

1992-09-10

1993-08-17

Arnold, Bruce Y.

Optical: systems and elements

Diffraction

From grating

359576, G02B 2746

Patent

active

052374521

ABSTRACT:
A wavelength-selective phase-grating optical low-pass filter has a phase difference structure formed at a boundary face between two layer materials which have different refractive index distributions and an identical refractive index at an intended wavelength. A trapezoid form is adopted at the phase difference section of the phase grating to achieve an excellent MTF characteristic in the condition of: ##EQU1## thereby obtaining a wavelength-selective phase-grating optical low-pass filter capable of adjusting the cutoff characteristic and improving the characteristic in the low-frequency region of the spatial frequency.

REFERENCES:
patent: 3821795 (1974-06-01), Okano
patent: 3911479 (1975-10-01), Sakurai
patent: 4093346 (1978-06-01), Nishino et al.
patent: 4178611 (1979-12-01), Okano
patent: 4795236 (1989-01-01), Ise
patent: 4998801 (1991-03-01), Shiraishi et al.
R. L. Townsend, "Spatial-Frequency Filter for a Kell-Type Color Camera", Applied Optics, Nov. 1992, vol. 11, No. 11, pp. 2463-2472.
Gerritsen et al., "Transmission Diffraction Gratings Comnposed of One Material With Anonalous Dispersion in the Visible Region", Applied Optics, vol. 27, No. 13, Jul. 1, 1988 pp. 2781-2785.
European Search Report for EPO 92115321.9.

Affiliated with

Also associated with

Rating

Wavelength-selective phase-grating optical low-pass filter does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Wavelength-selective phase-grating optical low-pass filter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Wavelength-selective phase-grating optical low-pass filter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2248822