Method for fixing optical information in crystals and for quasi-

Details Method for fixing optical information in crystals and for quasi- Method for fixing optical information in crystals and for quasi-

1995-10-17

1997-11-25

Dzierzynski, Paul M.

Optical: systems and elements

Holographic system or element

Having particular recording medium

359 32, 359328, G03H 102, G03H 122, G02F 135

Patent

active

056918291

ABSTRACT:
A method and apparatus for fixing images, holograms and domain gratings in crystals by application of an electric field on a crystal and simultaneous illumination of it with a light pattern. The fixing procedure is based on a screening effect. The modulation of the domains may be perpendicular to the c-axis. Another application of the method is in frequency mixing such as second harmonic generation and parametric processes, by overcoming the problem of phase matching using the domain gratings. Thus, it is possible to obtain controllable broadband mixing and tailored quasi-phase matching for several wavelengths or for prespecified wavelength tuning ranges and frequency widths.

REFERENCES:
patent: 4138189 (1979-02-01), Huignard et al.
patent: 4907850 (1990-03-01), Araki et al.
patent: 4953924 (1990-09-01), Redfield et al.
patent: 5202891 (1993-04-01), Sleight et al.

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