Liquid crystal electro-optic modulator in a fabry-perot interfer

Details Liquid crystal electro-optic modulator in a fabry-perot interfer Liquid crystal electro-optic modulator in a fabry-perot interfer

1987-09-04

1988-10-25

Miller, Stanley D.

350332, 350347E, 350347V, 350350S, G02F 113

Patent

active

047799595

ABSTRACT:
An electro-optic modulator consists of a Fabry-Perot etalon containing intra-cavity liquid crystal material between mirror layers. Each mirror bears a respective rubbed polyimide layer, which provides homogeneous alignment of the liquid crystal molecules. The mirror layers are connected to a bias voltage source, which provide an electrical bias variable between two values both above the threshold for refractive index sensitivity to applied voltage. For nematic materials, this is the Freedricks threshold or transition. The bias variation provides optical modulation of the etalon transmission with a time constant which is much shorter than devices switching between voltages either side of the threshold.

REFERENCES:
patent: Re32521 (1987-10-01), Fergason
patent: 3694053 (1972-09-01), Kahn
patent: 3891307 (1975-06-01), Tsukamoto et al.
patent: 4272195 (1981-06-01), Kaye
patent: 4444469 (1984-04-01), Kaye
patent: 4566758 (1986-01-01), Bos
patent: 4595292 (1986-06-01), Amodeo et al.

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