Miscellaneous Papers

High-gain holographic screens (230 KB)

Elliot Eichen and James C. Wyant
OPTICS LETTERS, Vol. 6, page 517, November 1981

A high-gain screen can be made as a sandwich of a hologram and a retroreflective screen material.  When a hologram is used in front of the screen instead of the screen material alone, the position of high-brightness viewing can be moved to any desired angle rather than being directed back along the projection beam.

URL: http://www.opticsinfobase.org/abstract.cfm?URI=ol-6-11-517

Use of a symbolic math system to solve polarized light problems (730 KB)

James C. Wyant
APPLIED OPTICS, Vol. 20, page 3321, 1 October 1981

The use of a symbolic math system, muMATH-79, to solve polarized light problems is described.  The problems are setup using Jones calculus, and muMATH running on a Z-80 microprocessor multiplies out the Jones matrices and simplifies the final algebraic expressions.  Only a minimal amount of operator interaction with the microcomputer is required.  Several examples are given.

URL: http://www.opticsinfobase.org/abstract.cfm?URI=ao-20-19-3321

Fringe localization (30 KB)

James C. Wyant
APPLIED OPTICS, Vol. 17, page 1853, June 15,1978

Real-time optical subtraction of photographic imagery for difference detection (1220 KB)

John F. Ebersole and James C. Wyant
APPLIED OPTICS, Vol. 15, page 871, June 1976

Interferometric techniques described in this paper permit real-time optical image subtraction of two input transparencies without the necessity of intermediate processing steps (e.g., holograms or contact-print transparencies).  These interferometric techniques allow the use of a white-light source as well as an extended light source, small input-collimator optics, and optical components with minimal requirements on wavefront quality.  Experimental results with NASA LANDSAT (formerly ERTS) photographs are presented.

URL: http://www.opticsinfobase.org/abstract.cfm?URI=ao-15-4-871

On-axis coherent optical feedback system for image processing (460 KB)

Poohsan N. Tamura and James C. Wyant
Proc. SPIE Vol. 74: 57-61, 1976

Coherent optical feedback systems always use a pair of tilted mirrors that physically separate the forward path and the feedback path, one of which is at an off-axis position.  This paper introduces an on-axis configuration with two parallel mirrors.  The application of the system to contrast enhancement and image restoration is presented.

Rotating Diffraction Grating Laser Beam Scanner (90 KB)

J. C. Wyant
APPLIED OPTICS, Vol. 14, page 1057, May 1975