Isophase birefringent filters

Details Isophase birefringent filters Isophase birefringent filters

1983-04-01

1985-10-22

Arnold, Bruce Y.

G02F 123

Patent

active

045484791

ABSTRACT:
An optical filter includes a first polarizer for transmitting light having a first polarization direction and a first birefringent element for receiving the light transmitted by the first polarizer. A second birefringent element, of a different material having a different birefringence, receives the light transmitted by the first element, while a second polarizer receives the light transmitted by the second element and transmits the portion having a second polarization direction. The birefringences and the thicknesses of the elements are arranged to effect a predetermined amount of net phase retardation, preferably zero, for light of a wavelength .lambda. in traversing the first and second elements.

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patent: 4273411 (1981-06-01), Alferness
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