Forming and reading holograms

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350320, G03H 102

Patent

active

044615337

ABSTRACT:
A method of forming and reading a hologram, useful for instance as a lens, is disclosed which eliminates chromatic aberrations usually present when a hologram is recorded using light of a higher frequency than that for which the hologram is to be used on reconstruction. The fringes created by the interference of two beams of radiation at the recording frequency in a first medium are transferred to a recording second medium by virtue of the second medium having a surface contiguous to the fringes in the first medium. The second medium is then developed to produce a hologram. A reconstruction beam from a laser having a lower frequency than that of the recording beams is directed at a third medium which is contiguous to a surface of the hologram so as to cause the wavelength of the read-out beam to equal that of the recording beams.

REFERENCES:
patent: 3598466 (1971-08-01), Friedl
patent: 3639031 (1972-02-01), Lin
patent: 3814498 (1974-06-01), Tomlinson et al.
patent: 4152045 (1979-05-01), Hammer
Latta, J. N., "Computer-Based Analysis of Hologram Imagery and Aberrations II: Aberrations Introduced by Wavelength Shift," Applied Optics, vol. 10, No. 3, pp. 609-618.

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