Optical grating using a liquid suspension of dielectric particle

Details Optical grating using a liquid suspension of dielectric particle Optical grating using a liquid suspension of dielectric particle

1981-02-19

1984-06-12

Arnold, Bruce Y.

3501622, G02B 518

Patent

active

044538057

ABSTRACT:
The invention provides apparatus comprising at least two beams of coherent radiation directed so as to intersect and form a standing wave pattern having a period .LAMBDA. in an optically responsive medium. The optically responsive medium is a colloidal suspension of dielectric particles in a liquid medium, the dielectric particles and liquid having different indices of refraction, and the diameter of the particles being less than or approximately equal to the period .LAMBDA.. The dielectric particles are arranged into a grating by the electric fields carried by the beams of coherent radiation. In an embodiment of the invention, the dielectric particles are small dielectric spheres. The dielectric particles and the liquid may have approximately equal mass densities. A third beam of light may generate an output beam of light by degenerate four-wave mixing processes incorporating a dielectric grating made by the electric fields carried by the beams of coherent radiation.

REFERENCES:
Arthur Ashkin, "Acceleration and Trapping of Particles . . . ", Physical Review Letters, vol. 24, No. 4, pp. 156-159 (Jan. 26, 1970).
A. Jay Palmer, "Nonlinear Optics in Aerosals", Optics Letters, vol. 5, No. 2, Feb. 1980, pp. 54-55.
"Selective Preview of U.S.A.", Laser Focus, Oct. 1980, pp. 12, 24, 26.
"Dow Uniform Latex Particles", Dow Diagnostics, pp. 1-4.
"What are Nalcoag Colloidal Silicas", Nalcoag Colloidal Silicas, Nalco. Chemical Co.
"Properties, Uses, Storage and Handling, LUDOX Colloidal Silica", Dupont Chemical Co., pp. 1-4.

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