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Bulletin of the Russian Academy of Sciences Physics

Observation of resonant four-photon parametric superluminescence under four-photon pumping of potassium and rubidium vapors

С. А. Бахрамов, I. G. Kirin, G. Kh. Tartakovskiǐ

Published Jun 1, 1981• 0 citations
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In this study we show the results for parametric non-degenerate four wave mixing (FWM) obtained using double lambda scheme at D1 line in hot potassium vapor. We have investigated the influence of one-photon detuning and two-photon detuning on the FWM gain. The laser frequency is locked at approximately 1GHz from the resonance 4S1/2 Fg=1 -< 4P1/2, using external reference cavity. The probe beam passes through acoustooptic modulator that enables controllable detuning around 460 MHz (ground state hyperfine splitting) in respect to the pump beam. The vacuum glass cell containing the potassium vapor was heated by hot air in order to achieve necessary concentration of atoms. The efficiency of FWM process is studied by measuring the gains of the conjugate beam the probe beam, simultaneously. The maximal gain was achieved for nonzero two photon detuning.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Jan 8, 2015•0 citations
An experimental investigation was made of the use of noise pumping in four-photon resonant parametric sum-frequency generation in potassium vapor. A two-photon resonance with the 9S1/2 and 7D3/2,5/2 levels and a one-photon resonance with the 10P1/2,3/2 and 11P1/2,3/2 levels were used. A comparison was made with the case of coherent pumping and it was found that, under conditions of strong dispersion and wave mismatch, the efficiency of the process using noise pumping differs negligibly from the efficiency using coherent pumping although the spectral density of the coherent pump is substantially higher than that of the noise pump.
In this study we show the results for parametric non-degenerate four wave mixing (FWM) obtained using double lambda scheme at D1 line in hot potassium vapor. We have investigated the influence of one-photon detuning and two-photon detuning on the FWM gain. The laser frequency is locked at approximately 1GHz from the resonance 4S1/2 Fg=1 -< 4P1/2, using external reference cavity. The probe beam passes through acoustooptic modulator that enables controllable detuning around 460 MHz (ground state hyperfine splitting) in respect to the pump beam. The vacuum glass cell containing the potassium vapor was heated by hot air in order to achieve necessary concentration of atoms. The efficiency of FWM process is studied by measuring the gains of the conjugate beam the probe beam, simultaneously. The maximal gain was achieved for nonzero two photon detuning.