Methods of and apparatus for optical spatial scanning

Details Methods of and apparatus for optical spatial scanning Methods of and apparatus for optical spatial scanning

1985-05-03

1987-08-18

Wise, Robert E.

350 9615, G02B 634

Patent

active

046872868

ABSTRACT:
A chirped grating focuses guided waves to variable space points as determined by the intensity of a control beam. This can be achieved with a light controlled spatial scanner which includes a corrugated waveguide fabricated of a material having a non-linear index coefficient of refraction n.sub.2. The waveguide has corrugations with a period that varies linearly from .LAMBDA.(O) at one point to .LAMBDA.(L) at another point, where .LAMBDA.(O) is greater than .LAMBDA.(L). Guided modes of light are applied within the waveguide in a direction from the one point to the other point wherein the corrugations couple light from the guided modes to radiation modes focused at a focal spot in space. The intensity of the light within the waveguide is varied to cause the focal spot to traverse a path without the waveguide, dependent upon the varied intensity.

REFERENCES:
patent: 3814498 (1974-06-01), Tomlinson et al.
patent: 4096446 (1978-06-01), Haus et al.
patent: 4262996 (1981-04-01), Yao
patent: 4286838 (1981-09-01), Huignard et al.
Katzir et al; "Chirped-Grating Output Couplers in Dielectric Waveguides"; Appl. Phys. Letters; vol. 30, No. 5, Mar. 1977; pp. 225, 226.
Yao et al; "Chirp-Grating Lens for Guided Wave Optics"; Appl. Physics Letters; vol. 33; pp. 635-637; 1978.
Katzir et al; "Chirped Gratings in Integrated Optics"; IEEE J. of Quantum Electronics; vol. QE-13, No. 4; pp. 296-304; 1977.

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