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Physical Review A

Doubly dressed states in a ladder-type system with electromagnetically induced transparency

Ray-Yuan Chang, Wei-Chia Fang, Zong-Syun He, B. C. Ke, Pei-Ning Chen, Chin‐Chun Tsai

Published Nov 28, 2007• 20 citations
Publisher

Abstract

Doubly dressed states in a ladder-type two-photon, three-level coupling system are observed. The electromagnetically induced transparency (EIT) doublet signal is interpreted as arising from the absorption and gain components of the Mollow spectrum. The separation of the EIT doublet matches the theoretical prediction. A numerical simulation demonstrates that the Doppler velocity group may perturb the light shift from the symmetric center of the EIT doublet. The quantum nature of the EIT system significantly suppresses Doppler broadening.

DOI
10.1103/physreva.76.053420

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Doubly dressed states in a ladder-type two-photon, three-level coupling system are observed. The electromagnetically induced transparency (EIT) doublet signal is interpreted as arising from the absorption and gain components of the Mollow spectrum. The separation of the EIT doublet matches the theoretical prediction. A numerical simulation demonstrates that the Doppler velocity group may perturb the light shift from the symmetric center of the EIT doublet. The quantum nature of the EIT system significantly suppresses Doppler broadening.
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We have studied the absorption spectrum of a Doppler-broadened ladder system,where the highest level is coupled into two middle hyperfine sublevels by a strong coherent field.We find that,when the system is considered as homogeneous,either two or three spectral components are observed,depending on the detuning of the coherent field.but when the velocity distribution of atoms is considered,we can always observe one electromagnetically induced transparency (EIT) window with high dispersion.So the atomic hyperfine structure cannot be an impediment for obtaining EIT.
We have studied the absorption spectrum of a Doppler-broadened ladder system, where the highest level is coupled into two middle hyperfine sublevels by a strong coherent field. We find that, when the system is considered as homogeneous, either two or three spectral components are observed, depending on the detuning of the coherent field. But when the velocity distribution of atoms is considered, we can always observe one electromagnetically induced transparency (EIT) window with high dispersion. So the atomic hyperfine structure cannot be an impediment for obtaining EIT.
Abstract The double resonance phenomenon of electromagnetically induced transparency (EIT) in a ladder-type Rydberg atomic system is theoretically investigated. Based on the cesium 6 S 1 / 2 → 6 P 3 / 2 → n D 5 / 2 transition, we establish a density-matrix model incorporating the Doppler effect and simulate the absorption spectra under counter-propagating laser configurations. The numerical approach is adopted: a two-velocity-group approximation (Lorentzian line-shape superposition). The results show that when the probe detuning Δ p is fixed and nonzero, scanning the coupling laser frequency yields two symmetric transparency peaks separated by δ = 2 ( λ p / λ c ) | Δ p | , in excellent agreement with recent experimental observations. The two-velocity-group approximation is computationally efficient and physically transparent, while the high-precision integration confirms its validity. We also reveal that conventional uniform velocity averaging fails to resolve the narrow EIT peaks due to insufficient sampling, and propose effective numerical strategies. This work provides a reliable theoretical tool for simulating Rydberg EIT spectra and offers insights into Doppler-induced double resonance, which may find applications in laser frequency stabilization and self-calibration of Rydberg atom-based sensors.
We present a theoretical treatment for the complete dynamics process of three-photon electromagnetically induced absorption (TPEIA). The nested-cascade doubly dressed TPEIA is considered when two counterpropagating coupling fields are tuned to the upper line in a closed-cycle ladder-type three-level atomic system. The enhancement or suppression of the TPEIA signal relies on the constructive interference between the excitation pathways of doubly dressed states, which can be controlled by changing the intensity of the coupling field. Meanwhile, two symmetrical transparency frequency windows are observed and discussed. The theoretical results and dressed-state analysis are demonstrated experimentally in the 5 S 1 / 2 ( F = 2 ) − 5 P 3 / 2 ( F ′ = 3 ) − 5 D 5 / 2 ( F ′ ′ = 4 ) transition of the 87 R b atoms.