Optical modulation element having two-dimensional phase type dif

Details Optical modulation element having two-dimensional phase type dif Optical modulation element having two-dimensional phase type dif

1991-10-07

1992-09-15

Miller, Stanley D.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 81, 359 82, 359 94, G02F 113

Patent

active

051483025

ABSTRACT:
An optical modulation element characterized in that a two-dimensional phase type diffraction gratings, whose refractive index changes for each predetermined period along two different directions in a predetermined plane, is adopted, and a changing state of the refractive index is controlled to change characteristics of the diffraction grating, so that a diffraction phenomenon of light incident on the element is controlled.

REFERENCES:
patent: 3843231 (1974-10-01), Borel et al.
patent: 3877790 (1975-04-01), Robinson
patent: 4251137 (1981-02-01), Knop et al.
patent: 4729640 (1988-03-01), Sakata
patent: 4751509 (1988-06-01), Kubota et al.
patent: 4850681 (1989-07-01), Yamanobe et al.
patent: 4913531 (1990-04-01), Efron et al.

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