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AIP conference proceedings

Electromagnetically induced transparency experiments in cesium vapor—Towards single photon operation

David Höckel, Matthias Scholz, Oliver J. Benson, Alexander I. Lvovsky

Published Jan 1, 2009• 0 citations
Publisher

Abstract

We describe first results with an experimental setup designed to store light pulses of ultra low intensity inside a cesium vapor cell by employing the effect of electromagnetically induced transparency. A phase‐locked laser system is used as pump and probe laser and probe laser pulses of Gauβian shape are delayed by up to 280 ns. We outline the route to single photon operation of the setup, in particular by introducing a novel filtering concept.

DOI
10.1063/1.3131319

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We describe first results with an experimental setup designed to store light pulses of ultra low intensity inside a cesium vapor cell by employing the effect of electromagnetically induced transparency. A phase‐locked laser system is used as pump and probe laser and probe laser pulses of Gauβian shape are delayed by up to 280 ns. We outline the route to single photon operation of the setup, in particular by introducing a novel filtering concept.
We perform electromagnetically induced transparency (EIT) experiments in cesium vapor with pulses on the single-photon level for the first time. This was made possible by an extremely large total suppression of the EIT coupling beam by 118 dB mainly due to a newly developed triple-pass planar Fabry-Pérot etalon filter. Slowing and shaping of single-photon light pulses as well as the generation of pulses suitable for quantum key distribution applications and testing of approaches for single photon storage is demonstrated. Our results extend single-photon EIT to the particularly interesting wavelength of the Cs D1 line.
Abstract We experimentally studied the electromagnetically induced transparency (EIT) in cesium (Cs) vapors under a three-level V -configuration system. Two independent diode lasers were employed in locked and scanning mode, respectively, for pumping and probing the atomic media. A probe laser was scanned across 6 S 1/2 ( F = 4) to all subsutructures of 6 P 3/2 ( F ′ = 5 , F ′ = 4 and F ′ = 3 ) and the pump was locked at F ′ = 5 or F ′ = 4 or F ′ = 3 of 6 P 3/2 . A good agreement of the experimental results with theoretical simulations was observed. The intensity and magnetic field dependence of the EIT spectrum in a V -type system of Cs atoms was also studied.
We present an investigation of electromagnetically induced transparency (EIT) without Doppler background due to a locked probe laser. The EIT is theoretically studied based on a multilevel ladder-type cesium atomic system 6S1/2{S}_{1/2}S1/2​--6P3/2{P}_{3/2}P3/2​--8S1/2{S}_{1/2}S1/2​ in a room-temperature vapor cell. The experimental results agree with the theoretical calculations. Compared with the traditional EIT spectra with a Doppler profile limiting the spectral resolution for keeping the coupling laser locked and scanning the probe laser, these EIT spectra with the probe laser locked and the coupling laser scanned have a flat background, which seem be of great benefit for applications such as the measurement of hyperfine intervals between excited states, the study of highly excited Rydberg states, laser-frequency stabilization, etc.
Employing an intense laser field coupling to the degenerate two-level system of cesium 6 2S_ 1/2(F=4)- 6 2P_ 3/2(F′=5) transition in a cesium vapor cell, electromagnetically induced absorption (EIA) has been demonstrated via probe absorption spectra, at the same time, electromagnetically induced transparency (EIT) of V-type three-level scheme has been demonstrated on the F=4-F′=3 and F=4-F′=4 transition frequency. The EIA is affected by the intensity and detuning of the coupling laser. By analyzing the effect of optical pumping between Zeeman sub-levels on the EIA and the coherent interactions between multiple degenerate two-level atoms, it is shown that the optical pumping affects the population of different Zeeman sub-levels and the number of the involved two-level atoms, the coherent time between the sub-levels is then changed and the linewidth and intensity of the EIA are affected accordingly.
Abstract This paper reviews recent efforts to realize a high‐efficiency memory for optical pulses using slow and stored light based on electromagnetically induced transparency (EIT) in ensembles of warm atoms in vapor cells. After a brief summary of basic continuous‐wave and dynamic EIT properties, studies using weak classical signal pulses in optically dense coherent media are discussed, including optimization strategies for stored light efficiency and pulse‐shape control, and modification of EIT and slow/stored light spectral properties due to atomic motion. Quantum memory demonstrations using both single photons and pulses of squeezed light are then reviewed. Finally a brief comparison with other approaches is presented.