2023
DOI: 10.1364/oe.481055
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Telecom-wavelength conversion in a high optical depth cold atomic system

Abstract: We experimentally investigate the frequency down-conversion through the four-wave mixing (FWM) process in a cold 85Rb atomic ensemble, with a diamond-level configuration. An atomic cloud with a high optical depth (OD) of 190 is prepared to achieve a high efficiency frequency conversion. Here, we convert a signal pulse field (795 nm) attenuated to a single-photon level, into a telecom light at 1529.3 nm within near C-band range and the frequency-conversion efficiency can reach up to 32%. We find that the OD is … Show more

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“…Rydberg atoms are promising candidates for microwave (MW) electric field measurements owing to their high polarizability and strong electric dipole moments [1][2][3][4][5][6][7][8][9]. In a room-temperature atomic ensemble of Cs atoms, the inhomogeneous broadening of Doppler effect σ (~350 MHz) is larger than the homogeneous broadening of the spontaneous decay linewidth Γ of the 6P state (~5.2 MHz).…”
Section: Introductionmentioning
confidence: 99%
“…Rydberg atoms are promising candidates for microwave (MW) electric field measurements owing to their high polarizability and strong electric dipole moments [1][2][3][4][5][6][7][8][9]. In a room-temperature atomic ensemble of Cs atoms, the inhomogeneous broadening of Doppler effect σ (~350 MHz) is larger than the homogeneous broadening of the spontaneous decay linewidth Γ of the 6P state (~5.2 MHz).…”
Section: Introductionmentioning
confidence: 99%