Method for holographically combining laser beams

Details Method for holographically combining laser beams Method for holographically combining laser beams

1992-01-29

1993-10-26

Arnold, Bruce Y.

Optical: systems and elements

Holographic system or element

Using modulated or plural reference beams

359 28, 359 35, G03H 104

Patent

active

052571181

ABSTRACT:
A holographic recording of the interference between an object laser beam and a reference laser beam is used to combine the amplitudes of multiple laser beams which are conjugates of the reference beam into a single laser beam which is conjugate of the object beam. An optical device in the form of a prism has an entrance face with a diffusion surface, and an exit face with a light sensitive recording medium. An object beam incident on the diffusion surface is scattered over the recording medium, in interference with a reference beam simultaneously incident at an angle .theta. onto the same medium. Multiple beams, conjugate to the reference beam, incident at angles .theta..+-.4.degree. on the hologram thus created on the recording medium are diffracted by the hologram and caused to combine at the diffusion surface to form a signal output beam, conjugate to the original object beam and having an amplitude which is proportional to the sum of the separate amplitudes of the combined beams.

REFERENCES:
patent: 3796476 (1974-03-01), Frosch et al.
patent: 4857425 (1989-08-01), Phillips
patent: 4984856 (1991-01-01), Moss et al.
R. Collier, et al. Optical Holography, Section 13.3.2 at pp. 370-373, Academic Press (1971).
H. Kogelnik, "Holographic Image Projection Through Inhomogenous Media," Bell System Tech. Briefs, vol. 44, pp. 2451-2455 (1965).

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