Doubly modulated on-axis thick hologram optical element

Details Doubly modulated on-axis thick hologram optical element Doubly modulated on-axis thick hologram optical element

1977-11-04

1981-01-20

Stern, Ronald J.

350 377, G02B 532, G03H 128

Patent

active

042458820

ABSTRACT:
An on-axis thick phase holographic optical element for use as a lens is fabricated by incorporating two off-axis holograms of two point sources located on opposite sides of the plate made by use of reference beams having a common angle with respect to the photographic media and complementary curvatures in the two cases. The element may be formed either by forming the two holograms in a single photographic emulsion, incoherently relative to one another, using a double exposure technique, or by forming the holograms on two physically separated media and then joining them to one another with their emulsion sides in contact. The resultant elements enjoy the low dispersion and aberrations like a conventional on-axis thin holographic optical element and the high diffraction efficiency like a thick hologram and additionally provide an extremely high ratio of diffracted to undiffracted light energy in the on-axis image.

REFERENCES:
patent: 3666345 (1972-05-01), Maslowski
patent: 4094577 (1978-06-01), Spitz et al.
Katyl, Applied Optics, vol. 11, No. 5, May 1972, pp. 1241-1247.
Alferness et al., Jour. of the Optical Society of America, vol. 65, No. 6, Jun. 1975, pp. 730-739.

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