Process for eliminating small-scale intensity fluctuations of la

Details Process for eliminating small-scale intensity fluctuations of la Process for eliminating small-scale intensity fluctuations of la

1974-02-08

1976-12-21

Sikes, William L.

Oscillators

Molecular or particle resonant type

331 945S, H01S 313

Patent

active

039991440

ABSTRACT:
A method for eliminating small-scale, spatial intensity fluctuations in laser beams is disclosed comprising the steps of placing in the path of the laser beam at least one nonlinear filtering element constituted by a fluid medium, having an index of refraction increasing with the intensity of light passing through the fluid medium and focusing only the laser's small-scale, spatial intensity fluctuations above a predetermined power threshold at a focal point within the fluid medium whereby the energy contained in these fluctuations is dissipated. Alternatively, the nonlinear filter element can be constituted by a fluid medium wherein high-frequency sound waves propagate with low attenuation wherein only the small-scale, spatial intensity fluctuations above a stimulated Brillouin power threshold are back-reflected whereby the energy contained in those fluctuations is eliminated.

REFERENCES:
patent: 3434779 (1969-03-01), Damen et al.
patent: 3575668 (1971-04-01), Smith

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