Directing optical beam

Details Directing optical beam Directing optical beam

1975-04-23

1977-02-08

Sikes, William L.

350 96WG, G02F 116

Patent

active

040069672

ABSTRACT:
Methods and apparatus for directing a beam of optical radiation toward a selected location and modulating the intensity thereof at the location by directing the beam over a path that includes a Bragg grating, and selectively modifying the angle between the direction at which the beam enters the Bragg grating and a direction of Bragg incidence of the grating by applying an electric or acoustic field to change the index of refraction in a portion of the path. An electric field may be applied either by interdigital electrodes at the grating, to change the Bragg angle thereof, or by electrodes at different angles across an earlier portion of the path, to change the direction at which the beam enters the grating. An acoustic field may be applied in an analogous manner. Useful for modulating and switching in planar wave guides and bulk material.

REFERENCES:
patent: 3814498 (1974-06-01), Tomlinson et al.
patent: 3884549 (1975-05-01), Wang et al.
patent: 3912363 (1975-10-01), Hammer

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