Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Conference on Lasers and Electro-Optics

Investigation of electromagnetically induced transparency in the strong probe regimen

Stephan Wielandy, Alexander L. Gaeta

Published Nov 27, 2002• 0 citations
Publisher

Abstract

Summary form only given. Though experiments in which a strong probe field was applied to an EIT system have been performed using pulsed lasers, previous investigations of the steady-state response of an EIT system to cw lasers have focused on the limit in which the probe field is weak. We investigate the behavior of an inhomogeneously broadened ladder system interacting with probe and control fields that are both strong. The experimental system we study is a gas of /sup 85/Rb atoms, where the lower level is the 5S/sub 1/2/ state, the intermediate level is the 5P/sub 3/2/ state, and the upper level is the 5D/sub 5/2/ state. To facilitate two-photon Doppler cancellation, the control and probe laser beams are counterpropagating. We theoretically model the response of this system by numerically solving the appropriate system of density-matrix equations without any approximations with respect to the strength of the control or probe field, and then numerically performing a Doppler average over the atomic velocity distribution.

DOI
10.1109/iqec.1998.680297

Related papers

Splitting of electromagnetically induced transparency under strong-probe conditions due to Doppler averaging

Kanhaiya Pandey, Vasant Natarajan A

We study the phenomenon of electromagnetically induced transparency (EIT) in room-temperature Rb vapour under conditions of a strong probe laser. The atoms form a ladder system with the lower transition coupled by the probe laser and the upper transition coupled by the control laser. Density-matrix analysis of the system shows that, for zero-velocity atoms, the strong probe beam causes a reduction in absorption and broadening of the profile. But the lineshape after thermal averaging shows a splitting of the EIT resonance and enhanced absorption near line centre. The experimental observations in $^{85}Rb$ agree qualitatively with the predicted lineshapes.

Journal of Physics B Atomic Molecular and Optical Physics•Sep 3, 2008•15 citations

Investigation of electromagnetically induced transparency in the strong probe regime

Stephan Wielandy, Alexander L. Gaeta

We study the response of an inhomogeneously broadened atomic three-level ladder system to a strong probe beam under conditions in which electromagnetically induced transparency would be induced on a weak probe beam. Theoretical analysis and experimental data show that saturation effects associated with the strong probe can substantially alter the behavior of the system and can result in enhanced probe absorption under exactly the same circumstances in which a weak probe would experience enhanced transparency. Strong probe effects are also shown to lead to a breakdown of the correspondence between population inversion and gain. A power-series solution of the density-matrix equations describing the ladder system provides a physical picture for strong probe effects in terms of interfering multiphoton transition pathways.

Physical Review A•Sep 1, 1998•96 citations

Electromagnetically induced transparency in a five-level cascade system under Doppler broadening: an analytical approach

Dinh Xuan Khoa, Pham Van Trong, Le Van Doai +1 more

Abstract We develop an analytical approach on electromagnetically induced transparency (EIT) in a Doppler broadened medium consisting of five-level cascade systems excited by a strong coupling and weak probe laser fields. In a weak field limit of the probe light, EIT spectrum is interpreted as functions of controllable parameters of the coupling light and temperature of the medium. The theoretical interpretation of EIT spectrum is applied to the case of 85 Rb atoms and compared with available experimental observation. Such an analytical interpretation provides quantitative parameters to control properties of the Doppler broadened EIT medium, and it is useful to find related applications.

Physica Scripta•Feb 1, 2016•28 citations

A study on electromagnetically induced transparency and velocity selective optically pumped absorption in an eight-level inverted Y-type atomic system

Arindam Ghosh, Khairul Islam, Suman Mondal +3 more

Abstract Coherent probe field (L A ) propagation through an eight-level inverted Y-type atomic system, in the presence of two additional coherent radiation fields termed the field L C (control or pump field) and the field L B (repump field), is investigated by using the parameters of 87 Rb 5 S 1 / 2 → 5 P 3 / 2 → 7 S 1 / 2 transitions. The system has two ground energy levels, four intermediate energy levels, and two uppermost energy levels. A theoretical model based on the density matrix method is used for numerical simulation of the probe response under different conditions. Simulated probe absorption spectra under a Doppler-free condition as well as under thermal averaging exhibit electromagnetically induced transparency (EIT). The position and line shape of this EIT profile change with different detunings of the control and repump fields. When the three coherent fields share a common level, a funnel-like EIT window appears in the simulated probe absorption curve. Velocity selective optically pumped absorption peaks are seen in the simulated probe response at room temperature.

Journal of Physics B Atomic Molecular and Optical Physics•May 22, 2018•10 citations

Revisiting the four-level inverted-Y system under both Doppler-free and Doppler-broadened conditions: an analytical approach

Arindam Ghosh, Khairul Islam, Dipankar Bhattacharyya +1 more

Abstract We report the occurrence of electromagnetically induced transparency (EIT) in the simulated probe response signal for a four-level inverted-Y type system that is being acted upon by a weak coherent probe field, a strong coherent pump field and a coherent repump field. There are two ground energy levels, one intermediate energy level and one uppermost energy level. The weak probe field couples the lowest ground level to the intermediate level whereas the repump field connects the other ground level with the intermediate level. The strong control field couples the intermediate level with the uppermost energy level, thereby forming an inverted-Y type system. The density matrix based theoretical model has been developed and solved analytically for this four-level system and the probe response signal has been simulated at different values of the control and repump Rabi frequencies, control and repump frequency detunings and under both Doppler-free and Doppler-broadened conditions using the parameters of 87 Rb D 2 transition. Extremely low line width (few tens of kHz) for the EIT signal has been noticed under thermal averaging for copropagating probe, control and repump field configuration. The EIT signal is found to be immune to the variation in the control Rabi frequency.

Journal of Physics B Atomic Molecular and Optical Physics•Sep 22, 2016•15 citations

Electromagnetically induced transparency and electromagnetically induced absorption in Y-type system

Kalan Mal, Khairul Islam, Suman Mondal +2 more

The propagation of a probe field through a four-level Y-type atomic system is described in the presence of two additional coherent radiation fields, namely, the control field and the coupling field. An expression for the probe response is derived analytically from the optical Bloch equations under steady state condition to study the absorptive properties of the system under probe field propagation through an ensemble of stationary atoms as well as in a Doppler broadened atomic vapor medium. The most striking result is the conversion of electromagnetically induced transparency (EIT) into electromagnetically induced absorption (EIA) as we start switching from weak probe regime to strong probe regime. The dependence of this conversion on residual Doppler averaging due to wavelength mismatch is also shown by choosing the coupling transition as a Rydberg transition.

Chinese Physics B•Mar 11, 2020•5 citations
Summary form only given. Though experiments in which a strong probe field was applied to an EIT system have been performed using pulsed lasers, previous investigations of the steady-state response of an EIT system to cw lasers have focused on the limit in which the probe field is weak. We investigate the behavior of an inhomogeneously broadened ladder system interacting with probe and control fields that are both strong. The experimental system we study is a gas of /sup 85/Rb atoms, where the lower level is the 5S/sub 1/2/ state, the intermediate level is the 5P/sub 3/2/ state, and the upper level is the 5D/sub 5/2/ state. To facilitate two-photon Doppler cancellation, the control and probe laser beams are counterpropagating. We theoretically model the response of this system by numerically solving the appropriate system of density-matrix equations without any approximations with respect to the strength of the control or probe field, and then numerically performing a Doppler average over the atomic velocity distribution.
We study the phenomenon of electromagnetically induced transparency (EIT) in room-temperature Rb vapour under conditions of a strong probe laser. The atoms form a ladder system with the lower transition coupled by the probe laser and the upper transition coupled by the control laser. Density-matrix analysis of the system shows that, for zero-velocity atoms, the strong probe beam causes a reduction in absorption and broadening of the profile. But the lineshape after thermal averaging shows a splitting of the EIT resonance and enhanced absorption near line centre. The experimental observations in 85Rb^{85}Rb85Rb agree qualitatively with the predicted lineshapes.
We study the response of an inhomogeneously broadened atomic three-level ladder system to a strong probe beam under conditions in which electromagnetically induced transparency would be induced on a weak probe beam. Theoretical analysis and experimental data show that saturation effects associated with the strong probe can substantially alter the behavior of the system and can result in enhanced probe absorption under exactly the same circumstances in which a weak probe would experience enhanced transparency. Strong probe effects are also shown to lead to a breakdown of the correspondence between population inversion and gain. A power-series solution of the density-matrix equations describing the ladder system provides a physical picture for strong probe effects in terms of interfering multiphoton transition pathways.
Abstract We develop an analytical approach on electromagnetically induced transparency (EIT) in a Doppler broadened medium consisting of five-level cascade systems excited by a strong coupling and weak probe laser fields. In a weak field limit of the probe light, EIT spectrum is interpreted as functions of controllable parameters of the coupling light and temperature of the medium. The theoretical interpretation of EIT spectrum is applied to the case of 85 Rb atoms and compared with available experimental observation. Such an analytical interpretation provides quantitative parameters to control properties of the Doppler broadened EIT medium, and it is useful to find related applications.
Abstract Coherent probe field (L A ) propagation through an eight-level inverted Y-type atomic system, in the presence of two additional coherent radiation fields termed the field L C (control or pump field) and the field L B (repump field), is investigated by using the parameters of 87 Rb 5 S 1 / 2 → 5 P 3 / 2 → 7 S 1 / 2 transitions. The system has two ground energy levels, four intermediate energy levels, and two uppermost energy levels. A theoretical model based on the density matrix method is used for numerical simulation of the probe response under different conditions. Simulated probe absorption spectra under a Doppler-free condition as well as under thermal averaging exhibit electromagnetically induced transparency (EIT). The position and line shape of this EIT profile change with different detunings of the control and repump fields. When the three coherent fields share a common level, a funnel-like EIT window appears in the simulated probe absorption curve. Velocity selective optically pumped absorption peaks are seen in the simulated probe response at room temperature.
Abstract We report the occurrence of electromagnetically induced transparency (EIT) in the simulated probe response signal for a four-level inverted-Y type system that is being acted upon by a weak coherent probe field, a strong coherent pump field and a coherent repump field. There are two ground energy levels, one intermediate energy level and one uppermost energy level. The weak probe field couples the lowest ground level to the intermediate level whereas the repump field connects the other ground level with the intermediate level. The strong control field couples the intermediate level with the uppermost energy level, thereby forming an inverted-Y type system. The density matrix based theoretical model has been developed and solved analytically for this four-level system and the probe response signal has been simulated at different values of the control and repump Rabi frequencies, control and repump frequency detunings and under both Doppler-free and Doppler-broadened conditions using the parameters of 87 Rb D 2 transition. Extremely low line width (few tens of kHz) for the EIT signal has been noticed under thermal averaging for copropagating probe, control and repump field configuration. The EIT signal is found to be immune to the variation in the control Rabi frequency.
The propagation of a probe field through a four-level Y-type atomic system is described in the presence of two additional coherent radiation fields, namely, the control field and the coupling field. An expression for the probe response is derived analytically from the optical Bloch equations under steady state condition to study the absorptive properties of the system under probe field propagation through an ensemble of stationary atoms as well as in a Doppler broadened atomic vapor medium. The most striking result is the conversion of electromagnetically induced transparency (EIT) into electromagnetically induced absorption (EIA) as we start switching from weak probe regime to strong probe regime. The dependence of this conversion on residual Doppler averaging due to wavelength mismatch is also shown by choosing the coupling transition as a Rydberg transition.