Sub-picosecond optical gating by degenerate four-wave mixing

Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons

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307425, H03F 700

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active

041780795

ABSTRACT:
A high speed, wide angular aperture, spectrally selective optical gate is achieved by using degenerate four-wave mixing. The apparatus utilizes two counterpropagating pump beams to interact with a probe beam through a third order nonlinearity in the susceptibility of a medium to produce an image beam which is counterdirectional to the probe beam. The image beam is produced only during the time that the two pump beams and the probe beam are coincident in time and space in media having a fast nonlinearity. In slow media, fast gating is achieved by turning off both pump beams after the probe beam and the pump beams have interacted. This apparatus produces gate times which are not limited by the speed of relaxation of the nonlinearity in the medium utilized.

REFERENCES:
Topics in Applied Physics, vol. 18, "Ultrashort Light Pulses", Editor, S. L. Shapiro, (1977), Ippen et al., pp. 90-92.
Hellwarth et al., "J. Opt. Soc. Am.", vol. 67, No. 1, Jan. 1977, pp. 1-3.
Bloom et al., "Applied Physics Letters", Nov. 1, 1977, pp. 592-594.
Bloom et al., "Optics Letters", Mar. 1978, pp. 58-60.

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