Iso-index birefringent filters

Details Iso-index birefringent filters Iso-index birefringent filters

1981-10-13

1985-02-19

Punter, William H.

350400, G02B 528

Patent

active

045001782

ABSTRACT:
Disclosed is an optical filter for selectively transmitting light in a passband at the wavelength .lambda., including an initial polarizer with a polarization direction perpendicular to a beam path and a final polarizer spaced from the initial polarizer along the path and having the same polarization direction. A birefringent element is positioned between the polarizers with an optic axis perpendicular to the path and rotated with respect to the polarization direction, the element having a birefringence which is zero at the wavelength .lambda.. Lyot-Ohman and Solc embodiments of the filter are also described.

REFERENCES:
patent: 4229073 (1980-10-01), Lotspeich
patent: 4247166 (1981-01-01), Yeh
Yeh, P., "Zero Crossing Birefringent Filters", Optics Communications, 10-1980, pp. 15-19.
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Evans, J. W., "The Birefringent Filter", Jr. Opt. Soc. Am., 3-1949, pp. 229-240.
Chandrasekharan, et al., Anomalous Dispersion of Birefringence of Sapphire and Magnesium Fluoride in the Vacuum Ultraviolet, 8, Appl. Optics, 671, (1969).
Evans, Solc Birefringent Filter, 48, J. Optocal. Soc. Am., 142, (1958).
Henry, Coupling of Electromagnetic Waves in CdS, 143, Phys. Rev., 627, (1966).
Laurenti, et al., Graded Composition Semiconductors as Tunable Narrow-Band Optical Filters, 48, J. Appl. Phys., 203, (1977).
Laurenti, et al., Optical Filters Using Coupled Light Waves in Mixed Crystals, 28, Appl. Phys. Lett., 212, (1976).
Lotspeich, Iso-Index Coupled-Wave Electrooptic Filter, QE-15, IEEE J. Quant. Elect., 904, (1979).
Pinnow, et al., An Electro-Optic Tunable Filter, 34, Appl. Phys. Lett., 391, (1979).

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