Computer Generated Holograms

Akira Ono and James C. Wyant
APPLIED OPTICS, Vol. 24, No. 4, 15 February 1985

A method for reducing errors in aspherical mirror testing using a computer-generated hologram (CGH) is described.  By using a modified filtering method the carrier frequency in the CGH can be reduced by two-thirds, and the resulting error due to distortion is only one-half of that of a conventional CGH.  By adopting a Fizeau-type optical setup, only the surface quality of the reference affects the measured results.

URL: http://www.opticsinfobase.org/abstract.cfm?URI=ao-24-4-560 

Akira Ono and James C. Wyant
APPLIED OPTICS, Vol. 23, No. 21, 1 November 1984

An improved interferometric method is described for measuring plotting errors of desk-top computer plotters used to make computer-generated holograms.  The plotting errors are measured using moiré fringes formed using Young's fringes and straight lines drawn by the plotters.  The Young's fringes are produced by laser beams originating from two single-mode fibers.  Using this method, plotting errors of Hewlett-Packard 7225A and 7470A plotters are measured.

URL: http://www.opticsinfobase.org/abstract.cfm?URI=ao-24-4-560

Computer Generated Hologram; Null Lens Test of Aspheric Wavefronts (190 KB)

J. C. Wyant and P. K. O’Neill
APPLIED OPTICS, Vol. 13, page 2762, December 1974

Interferometric Method of Measuring Plotter Distortion (330 KB)

J. C. Wyant, P. K. O’ Neill, and A. J. MacGovern
APPLIED OPTICS, Vol. 13, page 1549, July 1974

Using Computer Generated Hologram to Test Aspheric Wavefronts (220 KB)

J. C. Wyant and V. P. Bennett
APPLIED OPTICS, Vol. 12, page 2833, December 1972

The use of computer generated holograms for the testing of aspheric wavefronts is described. An analysis of the errors produced by emulsion movement, incorrect hologram size and position, and distortion in hologram plotter and photoreduction lens is given, and it is shown that all the errors are proportional to the slope of the aspheric wavefront. Experimental results verifying the error analysis are shown for testing rotationally nonsymmetric wavefronts having slopes as large as 125 waves per radius and departures as large as sixty-five waves.

URL: http://www.opticsinfobase.org/abstract.cfm?URI=ao-11-12-2833

Computer Generated Holograms for Testing Optical Elements (370 KB)

A. J. MacGovern and J. C. Wyant
APPLIED OPTICS, Vol. 10, page 619, March 1971

The application of computer generated holograms to the interferometric testing of aspheric optical elements has been investigated, and it has been shown that they provide a convenient and practical method of producing an aspheric reference wavefront.

URL: http://www.opticsinfobase.org/abstract.cfm?URI=ao-10-3-619

Computer Generated Holograms for Testing Aspheric Optical Elements (400 KB)

 J. C. Wyant and A. J. MacGovern
Applications de L'Holographie, Laboratoire de Physique Generale et Optique, Universite de Besancon, Besancon, France, 13-8, July, 1970.