Iso-index coupled-wave electro-optic filters

Details Iso-index coupled-wave electro-optic filters Iso-index coupled-wave electro-optic filters

1979-08-10

1980-10-21

Corbin, John K.

G02F 103

Patent

active

042290732

ABSTRACT:
Narrow-band optical filters are disclosed utilizing a birefringent crystal exhibiting a change in sign in birefringence at a predetermined wavelength and relying upon wave coupling between ordinary and extraordinary polarizations of light at or near the predetermined wavelength. The crystal is disposed along the light path between appropriately oriented polarizers, and a dc electric field is applied to the crystal either parallel or perpendicular to the light path. The dc electric field produces the aforementioned wave coupling for light at the center wavelength of the filter which normally is equal to the predetermined wavelength. The filter center wavelength may be displaced from the predetermined wavelength by employing a spatially periodic electric field.

REFERENCES:
Bhar et al., "Silver Thiogallate (AgGaS.sub.2)-Part II: Linear Optical Properties," IEEE Journal of Quantum Electronics, vol. QE-10, No. 7, (Jul. 1974), pp. 546-550.
Henry, C. H., "Coupling of Electromagnetic Waves in CdS," Physical Review, vol. 143, No. 2, (Mar. 1966), pp. 627-633.
Laurenti et al., "Optical Filters Using Coupled Light Waves in Mixed Crystals," Applied Physics Letters, vol. 28, No. 4, (15 Feb. 1976), pp. 212-213.
Laurenti et al., "Graded-Composition Semiconductors as Tunable Narrow-Band Optical Filters," Journal of Applied Physics, vol. 48, No. 1, (Jan. 1977), pp. 203-204.
Pinnow et al., "An Electro-Optic Tunable Filter," Applied Physics Letters, vol. 34, No. 6, (15 Mar. 1979), pp. 391-393.

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