Single plate birefringent optical filter

Details Single plate birefringent optical filter Single plate birefringent optical filter

1979-08-15

1981-01-27

Rosenberger, Richard A.

Optics: measuring and testing

Range or remote distance finding

With photodetection

350408, 350400, 356352, G02F 103

Patent

active

042471664

ABSTRACT:
Disclosed is an optical filter for transmitting light in a narrow bandwidth centered about the wavelength .lambda., including a birefringent half-wave crystal defining an optical path through the crystal and normal to the optical axis of the crystal, the thickness of the crystal effecting a 180.degree. phase change between the fast and slow components of light of wavelength .lambda. along the optical path; a first polarizer preceding the crystal in the optical path and having a first polarizing plane rotated 45.degree. about the optical path from the optic axis of the crystal; a first reflective surface preceding the first polarizer in the optical path and normal to the optical path; a second polarizer following the crystal in the optical path and having a second polarizing plane rotated 90.degree. about the optical path from the first polarizing plane; and a second reflective surface following the second polarizer in the optical path and normal to the optical path. The crystal may further be an electro-optic birefringent crystal, the filter then additionally including first and second electrodes affixed to the crystal and adapted to apply an electric potential across the crystal in the direction of the optical path, the transmission wavelength .lambda. thereby being tunable by adjusting the electric potential applied to the crystal.

REFERENCES:
patent: 3758194 (1973-09-01), Daval et al.
patent: 4129357 (1978-12-01), Title

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