Optical device with electrodes end-to-end with electric field ca

Details Optical device with electrodes end-to-end with electric field ca Optical device with electrodes end-to-end with electric field ca

1992-04-23

1994-05-17

Gross, Anita P.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 87, 359 89, 359 93, G02F 11337, G02F 11343, G02F 1137

Patent

active

053135628

ABSTRACT:
An electrically-controllable wave plate comprises a layer of liquid crystal material having positive dielectric anisotropy, the layer being contained between two transparent plates. An alignment layer is provided on each plate for causing homeotropic alignment of the LC molecules adjacent the plate. Electrodes are so positioned that they apply an electric field substantially along the plane of the LC layer so that the molecules acquire variable tilt through the thickness of the layer, resulting in birefringence of the layer. The wave plate may be used in a polarisation controller.

REFERENCES:
patent: 3807831 (1974-04-01), Soref
patent: 4291307 (1981-09-01), Peelle et al.
patent: 4496220 (1985-01-01), Goscianski
patent: 4889412 (1989-12-01), Clerc et al.
patent: 4948232 (1990-08-01), Lange
patent: 5084778 (1992-01-01), DeJule et al.
patent: 5103329 (1992-04-01), Clark et al.
patent: 5136407 (1992-08-01), Clerc
patent: 5182664 (1993-01-01), Clerc
patent: 5229873 (1993-07-01), Hirose et al.
Polarization Control for Coherent Communications, Journal of Lightwave Technology, vol. 8, No. 3, Mar., 1990, Nigel G. Walker et al., pp. 438-458.

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