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arXiv:1901.01582

Observation of dual electromagnetically induced transparencies in cold $^{87}Rb$ atoms

Mishra, Charu, A. Chakraborty, Surjya Prakash Ram, S. Singh, Vibhuti Bhushan Tiwari, Satya Ram Mishra

Published Jan 6, 2019• 0 citations
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Abstract

We have observed two dual electromagnetically induced transparency (EIT) spectra in probe transmission through cold $^{87}Rb$ atoms trapped in a magneto-optical trap (MOT). These dual EIT peaks are generated in two different N-systems formed by probe, coupling and control beams interacting with different levels in $D_{2}$ line transitions of $^{87}Rb$ atom. The dependence of spectral features of two N-systems on driving beams (\textit{i.e.} coupling and control beams) strength and detuning has been investigated. The results show that the dual EIT spectral features in both the N-systems can be manipulated by varying the strength and detuning of both the driving beams. The two N-systems have been modelled theoretically using a density matrix formalism and results have shown a reasonable agreement with the experimental observations.

DOI
10.48550/arxiv.1901.01582

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Observation of dual electromagnetically induced transparencies in cold 87Rb^{87}Rb87Rb atoms
We have observed two dual electromagnetically induced transparency (EIT) spectra in probe transmission through cold 87Rb^{87}Rb87Rb atoms trapped in a magneto-optical trap (MOT). These dual EIT peaks are generated in two different N-systems formed by probe, coupling and control beams interacting with different levels in D2D_{2}D2​ line transitions of 87Rb^{87}Rb87Rb atom. The dependence of spectral features of two N-systems on driving beams (\textit{i.e.} coupling and control beams) strength and detuning has been investigated. The results show that the dual EIT spectral features in both the N-systems can be manipulated by varying the strength and detuning of both the driving beams. The two N-systems have been modelled theoretically using a density matrix formalism and results have shown a reasonable agreement with the experimental observations.
Abstract We have investigated two N-systems in D 2 line transition of 87 Rb atoms theoretically and experimentally. The study has been carried out with cold 87 Rb atoms trapped in a magneto-optical trap. Each N-system has shown dual electromagnetically induced transparency (EIT) structure in probe transmission, which is qualitatively explained using dressed-state picture. The dependence of spectral features of N-systems on coupling and control beams strength and detuning has been investigated. The results show that the dual EIT spectral features in both the N-systems can be manipulated by varying the strength and detuning of coupling and control beams. The numerical modeling of the systems using density matrix formalism also explains the experimentally observed results.
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Studies on Electromagnetically Induced Transparency in Λ\LambdaΛ-systems in 87Rb^{87}Rb87Rb atom
We have investigated electromagnetically induced transparency (EIT) in two different Λ\LambdaΛ-systems in 87Rb^{87}Rb87Rb atom in D2D_{2}D2​ line transitions. It is found that observed EIT signals in both the systems (A) (∣52S1/2F=1⟩→∣52P3/2F′=1⟩←∣52S1/2F=2⟩|5^{2}S_{1/2} F=1\rangle \rightarrow |5^{2}P_{3/2} F'=1\rangle \leftarrow |5^{2}S_{1/2} F=2\rangle∣52S1/2​F=1⟩→∣52P3/2​F′=1⟩←∣52S1/2​F=2⟩) and (B) (∣52S1/2F=1⟩→∣52P3/2F′=2⟩←∣52S1/2F=2⟩|5^{2}S_{1/2} F=1\rangle \rightarrow |5^{2}P_{3/2} F'=2\rangle \leftarrow |5^{2}S_{1/2} F=2\rangle∣52S1/2​F=1⟩→∣52P3/2​F′=2⟩←∣52S1/2​F=2⟩) have different strength and lineshape which are dependent on coupling beam power. For a given coupling beam power, the EIT signal with Λ\LambdaΛ-system (B) has more symmetric lineshape and greater strength than that obtained with system (A). The experimental results are in qualitative agreement with the results of a six-level theoretical model. We have further investigated EIT in both these Λ\LambdaΛ-systems in presence of applied longitudinal magnetic field and observed that separation between Zeeman split-EIT peaks increased linearly with the strength of the magnetic field. At a fixed value of applied magnetic field, the strength of Zeeman split-EIT peaks in both the Λ\LambdaΛ-systems increases with increase in coupling beam power. In presence of magnetic field and at higher coupling power, the observed EIT signals (central peaks) have higher slope than that of signals obtained in absence of magnetic field. These studies establish that Λ\LambdaΛ-system (B) is more useful than Λ\LambdaΛ-system (A) from applications point of view.
We present the experimental observations and theoretical calculations of two electromagnetically induced transparency (EIT) windows and an enhanced EIT signal in a four-level tripod system of D1 line of 87 Rb atoms. The two EIT dips produced by a strong coupling beam and a weak trigger beam were observed in the absorption spectrum of probe field, when the frequency detuning of the trigger beam was different from that of the coupling beam. When the frequency detuning of the trigger beam was near or equal to that of the coupling beam, the total depth of the EIT dip created by the coupling beam clearly became larger. The experimental measurements were in agreement with theoretical calculations.
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