Polarization rotation with electromagnetically induced transparency in a V-type configuration of Rb D<sub>1</sub> and D<sub>2</sub> transitions

The dependency of polarization rotation with electromagnetically induced transparency (PREIT) in 87Rb vapor on the angular mismatch between the probe and the pump beams has been studied experimentally and theoretically for a V-type configuration. We have observed a nonlinear variation of the PREIT angle with the angular mismatch. The angular mismatch enhanced the residual Doppler broadening effect, as well as diminishes the two photon coherence contribution, in the medium. We have also systematically studied the effect of optical depth (OD) and the pump beam spot size variations to understand how the number of interacting atoms affect the two photon coherence contribution of the polarization rotation. The value of group velocity of the probe beam has been calculated from the experimentally observed spectrum. We have modeled a three-level V-type system to explain the experimentally observed phenomena by considering the effect of OD and spot size with angular mismatch in the medium. We have considered two-dimensional Maxwell–Boltzmann distribution to calculate the susceptibilities for all atoms of all velocity components. The characteristic variation of the angle of PREIT with the angular mismatch matches well with the experimentally observed result.

Section: Theorymentioning

confidence: 97%

“…In our previous study [33], we have shown that how the EIT phenomenon influences the PR of the probing field by forming a V-type system for both Rb 87 and Rb 85 with D 1 and D 2 transitions. It was also shown how this PR with electromagnetically induced transparency (PREIT) can be modified with the pump field intensity.…”

Section: Introductionmentioning

confidence: 94%

Angular dependency of the polarization rotation in a coherent atomic medium

Das

Bhattacharyya³

et al. 2019

“…V-EIT is the least studied of these because there is no stable dark state [11], as both of the singly coupled states are excited states and can decay to the ground state. Nevertheless, V-EIT has been extensively studied [6,[12][13][14][15][16][17][18][19][20][21][22][23][24][25], and provides an interesting testing ground for ascertaining the relative importance of coherent and incoherent mechanisms in the generation of the transparency window [16,26,27].…”

Section: Introductionmentioning

confidence: 99%

“…Throughout the text we refer to these beams as 'pump' and 'probe'. EIT has been widely studied and has potential applications in precision magnetometers [2][3][4], slow light generation [5,6], quantum information [7,8], and atomic clocks [9]. There are three possible configurations of EIT: V; lambda; and ladder [10].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetically induced transparency in a V-system with ⁸⁷Rb vapour in the hyperfine Paschen-Back regime

Higgins

Hughes

2021

We observe electromagnetically induced transparency (EIT) in a V-system in a thermal rubidium-87 vapour in the hyperfine Paschen-Back regime, realised with a 0.6 T axial magnetic field. In this regime energy levels are no longer degenerate and EIT features from different initial states are distinct, which we show produces a much cleaner feature than without a magnetic field. We compare our results to a model using the time-dependent Lindblad master equation, and having averaged over a distribution of interaction times, see good qualitative agreement for a range of pump Rabi frequencies. Excited state decay into both ground states is shown to play a prominent role in the generation of the transparency feature, which arises mainly due to transfer of population into the ground state not coupled by the probe beam. We use the model to investigate the importance of coherence in this feature, showing that its contribution is more significant at smaller pump Rabi frequencies.

“…Broad PRS resulting from VSR, polarization-enhanced absorption spectra, etc in the broad hyperfine manifold region also have been investigated. It has been reported that PRS resulting from VSRs are affected by neighboring hyperfine levels within Doppler profiles [21]. The rate equation model [10,11,[22][23][24] without considering coherences, full hyperfine structures, or Zeeman sublevels has often been used to calculate the PRS, but the ability to predict the precise line shapes of the PRS is limited.…”

Section: Introductionmentioning

confidence: 99%

Polarization rotation spectral profiles for the D2 line of ⁸⁷Rb atoms: theory and experiment

Moon

Yang

Kim

et al. 2019

We present a theoretical and experimental study of the polarization rotation of a linearly polarized probe beam scanning across all of the neighboring hyperfine levels (Fe = 1 and 2) with a circularly polarized pumping beam resonant on the transition of the D2 line of 87Rb atoms. The experimental results match well with the results calculated from the full-level density matrix equations considering laser phase noise, which hinders observations of narrow lines with linewidths of ∼90 kHz, as calculated in polarization rotation spectra for the first time.