Abstract
Collisional damping can induce a coupling between two nonresonant light beams propagating in an atomic vapor. This coupling is sufficiently important to induce a gain process for a weak probe beam interacting with an intense pump beam. We present here the first observation of a cw oscillation generated by this process using a cell which contains sodium and helium, the pump beam being slightly detuned from the ${\mathrm{D}}_{2}$ resonance line. We also show how the self-oscillation due to four-wave mixing is modified by the presence of a buffer gas.
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