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Two-photon resonant four-wave difference mixing in potassium vapor (A)

Peixian Ye, CHU GUI-YIN, Zhiguo Zhang +3 more

Journal of the Optical Society of America AJun 1, 19803 citations

Efficient parametric non-degenerate four-wave mixing in hot potassium vapor

B. Zlatković, Aleksandar J. Krmpot, Nikola Šibalić +2 more

Abstract We have observed high gains of the probe and the conjugate beams in non-degenerate four-wave mixing in hot potassium vapor, using a double-Λ configuration at the D1 line of the 39 K isotope. Gains of up to 82 for the conjugate beam and 63 for the probe beam have been achieved. Higher gains were obtained than with other alkali atoms under comparable experimental conditions due to lower ground state hyperfine splitting in the potassium atom. Experimental parameters for maximal gain have been determined. Notable gains are achieved at low pump intensities (~10 W cm −2 ) that are attainable even by conventional laser diodes. Due to their high gains, the probe and the conjugate beams may be suitable for utilization in quantum correlation and relative intensity squeezing experiments.Abstract We have observed high gains of the probe and the conjugate beams in non-degenerate four-wave mixing in hot potassium vapor, using a double-Λ configuration at the D1 line of the 39 K isotope. Gains of up to 82 for the conjugate beam and 63 for the probe beam have been achieved. Higher gains were obtained than with other alkali atoms under comparable experimental conditions due to lower ground state hyperfine splitting in the potassium atom. Experimental parameters for maximal gain have been determined. Notable gains are achieved at low pump intensities (~10 W cm −2 ) that are attainable even by conventional laser diodes. Due to their high gains, the probe and the conjugate beams may be suitable for utilization in quantum correlation and relative intensity squeezing experiments.

Laser Physics LettersNov 30, 201516 citations

Axially phase-matched parametric four- and six-wave mixing in potassium vapor

Mao-Hong Lu, Yumei Liu

Applied Physics BApr 1, 199213 citations

Four-wave mixing in potassium vapor with an off-resonant double- Λ system

M. M. Ćurčić, T. Khalifa, B. Zlatković +5 more

We investigate both theoretically and experimentally four-wave mixing (FWM) in hot potassium vapor, generated by a copropagating pump and probe in an off-resonant double-$\mathrm{\ensuremath{\Lambda}}$ system, and present conditions when this atomic system is (1) a strong phase-insensitive parametric amplifier and (2) a source of large-amplitude squeezing. Theoretically, nonperturbative numerical calculations of optical Bloch-Maxwell equations have been solved for a four-level atomic system of K in order to derive the atomic polarization and then amplitudes of propagating optical waves, pump, probe, and conjugate. For potassium, to our knowledge, there are no such comparisons of theoretical and experimental results of gains of twin beams under the large range of FWM parameters as presented here. Results have shown that one-photon detuning has to be slightly larger than the Doppler broadened transition for large gains and strong squeezing. The gain is particularly large for small red two-photon detuning ($\ensuremath{-}2--6\phantom{\rule{0.16em}{0ex}}\mathrm{MHz}$) and high K density ($5.5--10\ifmmode\times\else\texttimes\fi{}{10}^{12}\phantom{\rule{4pt}{0ex}}{\mathrm{cm}}^{\ensuremath{-}3}$). Following experimentally and theoretically determined relation between gains, probe transmissions, and squeezing in Rb and Cs, we have found parameters of FWM when maximum squeezing in hot K vapor is expected.We investigate both theoretically and experimentally four-wave mixing (FWM) in hot potassium vapor, generated by a copropagating pump and probe in an off-resonant double-$\mathrm{\ensuremath{\Lambda}}$ system, and present conditions when this atomic system is (1) a strong phase-insensitive parametric amplifier and (2) a source of large-amplitude squeezing. Theoretically, nonperturbative numerical calculations of optical Bloch-Maxwell equations have been solved for a four-level atomic system of K in order to derive the atomic polarization and then amplitudes of propagating optical waves, pump, probe, and conjugate. For potassium, to our knowledge, there are no such comparisons of theoretical and experimental results of gains of twin beams under the large range of FWM parameters as presented here. Results have shown that one-photon detuning has to be slightly larger than the Doppler broadened transition for large gains and strong squeezing. The gain is particularly large for small red two-photon detuning ($\ensuremath{-}2--6\phantom{\rule{0.16em}{0ex}}\mathrm{MHz}$) and high K density ($5.5--10\ifmmode\times\else\texttimes\fi{}{10}^{12}\phantom{\rule{4pt}{0ex}}{\mathrm{cm}}^{\ensuremath{-}3}$). Following experimentally and theoretically determined relation between gains, probe transmissions, and squeezing in Rb and Cs, we have found parameters of FWM when maximum squeezing in hot K vapor is expected.

Physical Review AJun 25, 20187 citations

Eliminating nonlinear phase mismatch in resonantly enhanced four-wave mixing

Mattias Johnsson, Eugeny Korsunsky, Michael Fleischhauer

arXiv:quant-ph/0205194Optics CommunicationsOct 21, 200215 citations

Toward bi-chromatic intensity squeezing at telecom wavelength using Four-Wave Mixing in Rb Vapor

Ziqi Niu, Jianming Wen, Chuanwei Zhang +2 more

We demonstrated an off-resonance intensity gain of more than 1.3 via double-ladder Four-Wave Mixing (FWM) process, and indicated preliminary evidence of beam noise correlation, suggesting the possibility of achieving bi-chromatic intensity squeezing.

Jan 1, 20240 citations

Enhanced intensity difference squeezing with a low gain off-resonant Four-Wave Mixing in potassium vapor

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Enhanced intensity difference squeezing with a low gain off-resonant Four-Wave Mixing in potassium vapor

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