Optical waveguide embedded light redirecting and focusing Bragg

Details Optical waveguide embedded light redirecting and focusing Bragg Optical waveguide embedded light redirecting and focusing Bragg

1989-12-26

1991-10-29

Sikes, William L.

Optical waveguides

With optical coupler

Input/output coupler

385 33, G02B 634

Patent

active

050610325

ABSTRACT:
An optical waveguide light redirecting arrangement includes an optical waveguide having a solid portion that guides light in a first path along a longitudinal axis, with at least one grating region being embedded in the solid portion at a location remote from its end portions. The grating region includes a multitude of grating elements extending at such longitudinal spacings and at such oblique angles relative to the longitudinal axis to redirect light reaching the grating elements between the first path and at least one second path extending externally of the waveguide and diverging between a focus situated at a predetermined distance from the waveguide and the grating region. When light is directed in one of the first and second paths toward the grating region, it is redirected by the grating elements into the respectively other of the second and first paths with attendant in-phase combination in the other path of light having a wavelength within a range around a central wavelength. The grating elements are formed in the waveguide by exposing the waveguide to an interference pattern of two ultraviolet radiation beams that are symmetrical with respect to a plane extending at the oblique angle relative to the waveguide axis at the center of the grating region.

REFERENCES:
patent: 3814498 (1974-06-01), Tomlinson et al.
patent: 4687286 (1987-08-01), Winful
patent: 4725110 (1988-02-01), Glenn et al.
patent: 4737007 (1988-04-01), Alferness et al.
patent: 4807950 (1989-02-01), Glenn et al.

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