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Chinese Physics Letters

The Probe Transmission Spectra of 87 Rb in an Operating Magneto-Optical Trap in the Presence of an Ionizing Laser

Long-Wei Liu, Feng-Dong Jia, Ya-Ping Ruan, Wei Huang, Shuang-Fei Lv, Ping Xue, Xiang-Yuan Xu, Xing-Can Dai, Zhi-Ping Zhong

Published Apr 1, 2013• 2 citations
Publisher

Abstract

The influence of an ionizing laser on the pump-probe spectra of 87 Rb over the transition 5 2 S 1/2 , F = 2 → 5 2 P 3/2 , F' = 3 is experimentally studied in an operating magneto-optical trap. These spectral features, including gain peak, a dispersion-like structure and absorption peak, become weak as the intensity of the ionizing laser increases. Moreover, the profiles of the absorption peak and gain peak vary as the ionizing laser intensity changes. Such results indicate that there is more than one component in the two features and that each component has different dependences on the number of 87 Rb atoms.

DOI
10.1088/0256-307x/30/4/043201

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The influence of an ionizing laser on the pump-probe spectra of 87 Rb over the transition 5 2 S 1/2 , F = 2 → 5 2 P 3/2 , F' = 3 is experimentally studied in an operating magneto-optical trap. These spectral features, including gain peak, a dispersion-like structure and absorption peak, become weak as the intensity of the ionizing laser increases. Moreover, the profiles of the absorption peak and gain peak vary as the ionizing laser intensity changes. Such results indicate that there is more than one component in the two features and that each component has different dependences on the number of 87 Rb atoms.
We investigate systematically pump-probe spectroscopy of cold 87Rb{}^{87}\mathrm{Rb}87Rb atoms produced by a magneto-optical trap. The pump-probe spectra are measured without the presence of the trapping beams or any optical molasses. Various polarization configurations of the probe and pump fields result in very different spectra of probe absorption. The observed spectra exhibit a dispersive profile, a dispersionlike profile, a Lorentzian profile, or a dispersive profile plus a Lorentzian profile. The widths of all the spectral profiles are narrower than the natural linewidth of the excited state. Our work clarifies the mechanisms behind these different spectral profiles and provides essential information for the pump-probe spectroscopy of cold atoms.
We present results of our experimental investigations of nonlinear ground-state pump-probe spectroscopy in ultracold 85{}^{85}85Rb collected in a magneto-optical trap. These measurements represent an extension of a similar pump-probe spectroscopy in a two-level atomic system when strongly driven by a near-resonant pump beam. In the present three-level system, coherence-induced gain at the probe laser frequency can be observed at specific frequencies within the spectrum. The absorption or gain spectra that we observe resemble those of the two-level gain spectra, but different interference processes lead to features that are not present in the two-level case. We describe our measurements of this interaction in this work.
We report on cw measurements of probe beam absorption and four-wave-mixing spectra in a 85Rb^{85}\mathrm{Rb}85Rb magneto-optical trap taken while the trap is in operation. The trapping beams are used as pump light. We concentrate on the central feature of the spectra at small pump-probe detuning and attribute its narrow resonant structures to the superposition of Raman transitions between light-shifted sublevels of the ground atomic state and to atomic recoil processes. These two contributions have different dependencies on trap parameters and we show that the former is inhomogeneously broadened. The strong dependence of the spectra on the probe-beam polarization indicates the existence of large optical anisotropy of the cold-atom sample, which is attributed to the recoil effects. We point out that the recoil-induced resonances can be isolated from other contributions, making pump-probe spectroscopy a highly sensitive diagnostic tool for atoms in a working magneto-optical trap.
We present experimental observation of recoil-induced resonance (RIR) in an operating cesium magneto-optical trap (MOT) by both pump–probe absorption and four-wave mixing spectra simultaneously. We investigate the dependence of amplitudes of these two spectra on pump beam intensity and frequency. The measurement results agree well with the recoil-induced theory with modifications of Raman transition effect and atomic number. The systematical study on RIR spectra is meaningful for the diagnostic measurement of cold atoms in an operating MOT.