Understanding asymmetry in electromagnetically induced transparency for 87 Rb in strong transverse magnetic field
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THE EUROPEAN PHYSICAL JOURNAL D
Regular Article
Understanding asymmetry in electromagnetically induced transparency for 87Rb in strong transverse magnetic field Indra Hang Subba1 , Ranjit Kumar Singh1 , Nayan Sharma1 , Souvik Chatterjee2 , and Ajay Tripathi1,a 1 2
Department of Physics, Sikkim University, 6th Mile Samdur, East Sikkim 737102, India Department of Chemistry, Sikkim University, 6th Mile Samdur, East Sikkim 737102, India Received 23 January 2020 / Received in final form 25 April 2020 Published online 1 July 2020 c EDP Sciences / Societ`
a Italiana di Fisica / Springer-Verlag GmbH Germany, part of Springer Nature, 2020 Abstract. We present the results of our experimental investigation performed for D2 line of 87 Rb. In this work, we have studied the phenomenon of electromagnetically induced transparency of 87 Rb in presence of a transverse magnetic field and it is interesting to find the EIT spectrum shows signature of the closely lying hyperfine excited states in particular F 0 = 1. We choose two different configurations for our study namely, Λ1 and Λ2 realised by locking probe beam at two different transition i.e. |F = 1i → |F 0 = 2i and |F = 2i → |F 0 = 2i respectively. We observe asymmetric features in both configurations at high magnetic field and for Λ1 configuration we find complete conversion from transmission to absorption. We explain the observations by quantitative assessment of the impurities in the dark states which arises because of the influence of the neighbouring states. We substantiate our experimental findings with density based numerical calculations.
1 Introduction Electromagnetically induced transparency (EIT) is a phenomenon caused by destructive interference of the alternative transition amplitudes. It was for the first time predicted by Harris et al. [1] and observed experimentally in Sr vapor by Boller et al. [2] and in Pb vapor by Field et al. [3]. It is based on atomic coherence created by coherent light source and has wide number of applications in laser cooling [4], magnetometry [5], slow light [6,7], quantum information processing [8], etc. Numerous experimental and theoretical works have been done by various groups to study the characteristics of EIT resonance [9–15]. EIT is usually studied and observed in the limit Ppu (pump power) Ppr (probe power), as high value of Ppu ensures that the system evolves into a dark state which is identical to the ground state (in an ideal 3-level Λ system) which is coupled by a weak probe and thereby, making it transparent [16]. In recent years, study of EIT and its characteristics in presence of a magnetic field has attracted a lot of interest. In general, presence of magnetic field stimulates the origin of EIT sub windows with narrow widths [17]. The number of EIT sub-windows formed in presence of magnetic field depends upon the number of available states and the polarization of light [18,19]. Due to the application of magnetic field, number of states that may participate in EIT becomes significantly large and a simple a
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