Electromagnetic induced transparency in the Doppler broadened cascade transition with multiple excited levels

Bharti, Vineet; Wasan, Ajay D.

doi:10.1088/0953-4075/45/18/185501

Cited by 29 publications

(34 citation statements)

References 41 publications

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“…The asymmetry in the signal is defined as difference between two minima values surrounding the EIT peak. The asymmetry in line shape of the EIT signal may be due to the presence of other nearby excited states, as reported earlier [37,38]. A more asymmetric EIT signal in the Λ-system (A) than that in the system (B) could possibly be due to this effect, as excited state in the system (A) has more closely spaced nearby levels than the system (B).…”

Section: A Experimental Resultssupporting

confidence: 60%

Electromagnetically induced transparency in Λ-systems of ⁸⁷Rb atom in magnetic field

Mishra

Chakraborty

Srivastava

et al. 2018

Journal of Modern Optics

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The electromagnetically induced transparency (EIT) observations in two Λ-systems of 87 Rb atom, |5 2 S 1/2 F = 1 → |5 2 P 3/2 F = 1 ← |5 2 S 1/2 F = 2 and |5 2 S 1/2 F = 1 → |5 2 P 3/2 F = 2 ← |5 2 S 1/2 F = 2 , have been investigated in detail and the results are found consistent with our proposed theoretical models. The second Λ-system provides EIT signal with higher magnitude than the first system, both in absence and in presence of an applied magnetic field. The observed steeper slope of the EIT signal in presence of the magnetic field can enable one to achieve tight frequency locking of lasers using these EIT signals.

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Section: A Experimental Resultssupporting

confidence: 60%

Electromagnetically induced transparency in Λ-systems of ⁸⁷Rb atom in magnetic field

Mishra

Chakraborty

Srivastava

et al. 2018

Journal of Modern Optics

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“…For our numerical calculations, we assume that the loss rate of atoms is much smaller than the radiative decay rates of the excited states, τ −1 d ≪ Γ e 1 ,e 2 ,e 3 ,e 4 ,e 5 . The radiative decay rate of the excited states are 26.1 ns, so we assume τ d ≈ 300µs which corresponds to the interaction time with e.m. fields of a few millimeters in diameter for all temperature [31,32]. We also assume that the rate at which new atoms are entering the interaction region is equal to the rate at which atoms are leaving the interaction region.…”

Section: Theoretical Modelmentioning

confidence: 99%

“…So the transitions among these degenerate magnetic sublevels have to be considered. It has already been studied that the presence of these hyperfine levels affects the absorption profiles significantly in the various configurations of EIT [30,31,32,33,34].…”

Section: Introductionmentioning

confidence: 99%

Optical properties of an inhomogeneously broadened multilevel V-system in the weak and strong probe regimes

2017

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We present a theoretical model, using density matrix approach, to study the effect of weak as well as strong probe field on the optical properties of an inhomogeneously broadened multilevel V-system of the 87 Rb D2 line. We consider the case of stationary as well as moving atoms and perform thermal averaging at room temperature. The presence of multiple excited states results in asymmetric absorption and dispersion profiles. In the weak probe regime, we observe the partial transparency window due to the constructive interference occurs between transition pathways at the line center. In a room temperature vapour, we obtain an increased linewidth of the transparency window and steep positive dispersion. For a strong probe regime, the transparency window with normal dispersion switches to enhanced absorption with anomalous dispersion at the line center. Here, we show how the electromagnetically induced transparency (EIT) depends on the polarizations of the applied fields. We also discuss the transient behaviour of our system which agrees well with the corresponding absorption and dispersion profiles. This study may help to understand optical switching and controllability of group velocity.

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“…The various density-matrix elements are solved following the procedure given in Ref. [10]. The steady-state solution for ρ 12 is given by…”

Section: Theoretical Considerationsmentioning

confidence: 99%

Study of a four-level system in vee + ladder configuration

Bharti

Natarajan

2015

Optics Communications

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We present the results of a theoretical study of a four-level atomic system in vee + ladder configuration using a density matrix analysis. The absorption and dispersion profiles are derived for a weak probe field and for varying strengths of the two strong control fields. For specificity, we choose energy levels of 87 Rb, and present results for both stationary atoms and moving atoms in room temperature vapor. An electromagnetically induced absorption (EIA) peak with negative dispersion is observed at zero probe detuning when the control fields have equal strengths, which switches to electromagnetically induced transparency (EIT) with positive dispersion (due to splitting of the EIA peak) when the control fields are unequal. There is significant linewidth narrowing in thermal vapor.

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Electromagnetic induced transparency in the Doppler broadened cascade transition with multiple excited levels

Cited by 29 publications

References 41 publications

Electromagnetically induced transparency in Λ-systems of ⁸⁷Rb atom in magnetic field

Electromagnetically induced transparency in Λ-systems of ⁸⁷Rb atom in magnetic field

Optical properties of an inhomogeneously broadened multilevel V-system in the weak and strong probe regimes

Study of a four-level system in vee + ladder configuration

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Electromagnetic induced transparency in the Doppler broadened cascade transition with multiple excited levels

Cited by 29 publications

References 41 publications

Electromagnetically induced transparency in Λ-systems of 87Rb atom in magnetic field

Electromagnetically induced transparency in Λ-systems of 87Rb atom in magnetic field

Optical properties of an inhomogeneously broadened multilevel V-system in the weak and strong probe regimes

Study of a four-level system in vee + ladder configuration

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Electromagnetically induced transparency in Λ-systems of ⁸⁷Rb atom in magnetic field

Electromagnetically induced transparency in Λ-systems of ⁸⁷Rb atom in magnetic field