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Physics Letters A

Intensity fluctuations of the 87Rb pulsed atom laser

Xia Lin, F. Yang, Xiaoji Zhou, Xuzong Chen

Published Feb 26, 2009• 4 citations
Publisher
DOI
10.1016/j.physleta.2009.02.042

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We present measurements of the intensity fluctuations of electromagnetically induced absorption (EIA) in the 5S₁/₂ (F = 2)-5P₃/₂(F' = 3) transition of ⁸⁷Rb atoms. Using a linearly polarized laser, the intensity fluctuations between two circularly polarized light components was generated by the spontaneously transferred atomic coherence of EIA medium. The intensity fluctuations due to spontaneous transfer of coherence were changed from correlation of EIA at on-resonance to anti-correlation of EIA at off-resonance. We also investigated the dependence of the values of second-order correlation function g(²)(0) at zero delay time on the temperature of the atomic vapor cell and the incident laser power.
A comparison between forward and diffusely scattered light propagating in a coherently prepared ultracold 87Rb atomic vapor is presented. This research is part of the ongoing effort to characterize the processes, such as diffusion, that contribute to coherence loss in atomic media under conditions of electromagnetically induced transparency, for applications in realistic systems. Toward this end, a magneto optical trap (MOT) of 87Rb has been built, and the atomic vapor sample characterized in terms of atomic density, shape and size, temperature, and optical depth. Next, two co-propagating beams were sent through the sample, to establish an electromagnetically induced transparency in a Λ-type system. In these measurements the two laser fields are not phase-locked, so ground state coherence will be affected by the lasers' phase fluctuations. Observation of the forward and diffusely scattered light were made for different conditions of probe pulse length, control field intensity, and probe field frequency detuning. Storage and retrieval of slow light pulses was achieved for the forward scattering (transmission) channel, but was not observed unambiguously in the diffusely scattered (fluorescence) channel.