Optical: systems and elements – Holographic system or element – Using modulated or plural reference beams
Patent
1992-01-29
1993-10-12
Sugarman, Scott J.
Optical: systems and elements
Holographic system or element
Using modulated or plural reference beams
359 1, 359 15, 359618, 359831, 359 28, G02B 532, G02B 2710, G02B 504
Patent
active
052530868
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 input laser beams which are conjugates of the reference beam, into a single output laser beam which is a conjugate of the object beam. An optical device in the form of a trapezoidal prism has an entrance top face with a diffusion surface, and an exit base face with a holographic recording made on a light sensitive recording medium of an interference pattern of an object beam incident on the diffusion surface and scattered over the recording medium, in interference with a reference beam simultaneously incident to a side of the prism onto the same medium. Multiple beams, conjugate to the reference beam, are positioned to be incident on the holographic recording, the hologram being configured to diffract the multiple beams and cause them to be combined at the diffusion surface to form a single 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: 3623798 (1971-11-01), Sheridon
patent: 4626679 (1986-12-01), Kuwayama et al.
patent: 4908285 (1990-03-01), Kushibiki et al.
patent: 4960314 (1990-10-01), Smith et al.
patent: 5013107 (1991-05-01), Biles
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).
Arnold Stephen C.
Lungershausen Arnold W.
Eastman Kodak Company
Franz Warren Locke
Kaufman Stephen C.
Parsons David R.
Sembrat Kevin A.
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