Achromatic holographic element

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350320, G02B 532

Patent

active

044471114

ABSTRACT:
A process for producing a holographic optical element which operates at a multiplicity of wavelengths and which has no chromatic aberration is disclosed. The achromatic holographic elements are fabricated using substantially conventional apparatus employing a technique based on the phenomenon that any two playback wavelengths will be diffracted to the same angle if their construction angles are related to each other as the inverse of the ratio of their sines. In addition, in the case of holographic lenses, if the focal points during construction are related to each other as the inverse of the ratio of the sines of their construction angles, the diffracted wavelengths will be brought to a common focal point.

REFERENCES:
patent: 3405614 (1970-03-01), Lin et al.
patent: 3503050 (1970-03-01), Schools et al.
patent: 3586412 (1971-06-01), Leith
patent: 3630593 (1971-12-01), Bartelt
patent: 3680945 (1972-08-01), Sheridon
patent: 3970358 (1976-07-01), Kozma
patent: 4017158 (1977-04-01), Booth
patent: 4250465 (1981-02-01), Leib
Horner et al., "Single Holographic Element Wavelength Demultiplexer" Applied Optics, vol. 20, No. 10, May 15, 1981, pp. 1845-1847.
Kenneth G. Leib, Investigation and Implementation of Optical Memory for a Correlation Seeker, Jul. 1983, pp. 2-1, 2-2 & 2-3.

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