Tunable wide angular aperture filter by degenerate four-wave mix

Details Tunable wide angular aperture filter by degenerate four-wave mix Tunable wide angular aperture filter by degenerate four-wave mix

1978-05-23

1980-04-15

Corbin, John K.

Optics: measuring and testing

By particle light scattering

With photocell detection

356 285, 356351, G01B 902

Patent

active

041981626

ABSTRACT:
A wide angular aperture, tunable filter device is achieved by using degenerate four-wave mixing. The apparatus utilizes two counter-propagating pump beams at substantially the same frequency to interact with an object beam, containing a spread of frequency components through a third order nonlinearity in the susceptibility of a medium. This produces a conjugate image beam formed with frequency components close to the frequency of the pump beams. By tuning the frequency of the pump beams the object beam frequency spectrum may be scanned while preserving all of the spatial information in the object beam. Apparatus for generating velocity contours of moving objects is also disclosed.

REFERENCES:
patent: 3409369 (1968-11-01), Bickel
patent: 3820896 (1974-06-01), Stavis
patent: 4145671 (1979-03-01), Hellwarth
Bloom, D. M. et al., "Observation of Amplified . . . ," Optics Letters, vol. 2, No. 3, Mar. 1978, pp. 58-60.
Jensen, S. M. et al., "Observation of Time Reversed . . . ," Applied Physics Letters, vol. 32, No. 3, Feb. 1978, pp. 166-168.
Bloom, D. M. et al., "Conjugate Wave-Front. . . ," Applied Physics Letters, vol. 31, No. 9, Nov. 1977, pp. 592-594.
Hellwarth, R. W., "Generation of Time Reversed . . . ," J. Opt. Sec. Am., vol. 67, No. 1, Jan. 1977, pp. 1-3.

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