Abstract
We report the observation of nearly degenerate four-wave mixing in Ar gas discharges at 867 nm (transition 1s3-2p7) using a low power c.w. laser. The weak phase-conjugate emission has been observed by means of a heterodyne detection technique at 30 MHz. This experimental scheme should be able to yield ultimate shot-noise limited signals, and thus could be used as a sensitive tool for phase-conjugation studies.
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