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Title: Perturbing an electromagnetically induced transparency in a {lambda} system using a low-frequency driving field. I. Three-level system

Abstract

Electromagnetically induced transparency (EIT) resonance in a {lambda} configuration is obtained when the frequencies of two fields are close to resonance with two of the transitions and their frequency difference matches the frequency of the third transition. In this situation the spectrum of one swept field as a probe gives a simple transparency feature. However, when an additional field drives the third transition the EIT feature associated with the probe is split. This perturbed EIT is illustrated for both single and bichromatic driving fields. In the single-driving-field case a density matrix treatment is shown to be in reasonable agreement with experiment, and in both single and bichromatic cases the structure in the spectrum can be explained using the dressed-state formalism. The dressed states can also be used to account for subharmonic resonances observed in the strong-probe regime.

Authors:
; ; ;  [1];  [2]
  1. Laser Physics Center, Research School of Physical Sciences and Engineering, Australian National University, Canberra, Australian Capital Territory, 0200 (Australia)
  2. (China)
Publication Date:
OSTI Identifier:
20786376
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. A; Journal Volume: 72; Journal Issue: 6; Other Information: DOI: 10.1103/PhysRevA.72.063813; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; DENSITY MATRIX; ELECTROMAGNETISM; ENERGY LEVELS; ENERGY SPECTRA; OPACITY; OPTICS; PROBES; QUANTUM MECHANICS; RESONANCE

Citation Formats

Wilson, E. A., Manson, N. B., Wei, C., Yang Lijun, and College of Physical Sciences and Technology, Hebei University, Baoding 071002. Perturbing an electromagnetically induced transparency in a {lambda} system using a low-frequency driving field. I. Three-level system. United States: N. p., 2005. Web. doi:10.1103/PHYSREVA.72.0.
Wilson, E. A., Manson, N. B., Wei, C., Yang Lijun, & College of Physical Sciences and Technology, Hebei University, Baoding 071002. Perturbing an electromagnetically induced transparency in a {lambda} system using a low-frequency driving field. I. Three-level system. United States. doi:10.1103/PHYSREVA.72.0.
Wilson, E. A., Manson, N. B., Wei, C., Yang Lijun, and College of Physical Sciences and Technology, Hebei University, Baoding 071002. Thu . "Perturbing an electromagnetically induced transparency in a {lambda} system using a low-frequency driving field. I. Three-level system". United States. doi:10.1103/PHYSREVA.72.0.
@article{osti_20786376,
title = {Perturbing an electromagnetically induced transparency in a {lambda} system using a low-frequency driving field. I. Three-level system},
author = {Wilson, E. A. and Manson, N. B. and Wei, C. and Yang Lijun and College of Physical Sciences and Technology, Hebei University, Baoding 071002},
abstractNote = {Electromagnetically induced transparency (EIT) resonance in a {lambda} configuration is obtained when the frequencies of two fields are close to resonance with two of the transitions and their frequency difference matches the frequency of the third transition. In this situation the spectrum of one swept field as a probe gives a simple transparency feature. However, when an additional field drives the third transition the EIT feature associated with the probe is split. This perturbed EIT is illustrated for both single and bichromatic driving fields. In the single-driving-field case a density matrix treatment is shown to be in reasonable agreement with experiment, and in both single and bichromatic cases the structure in the spectrum can be explained using the dressed-state formalism. The dressed states can also be used to account for subharmonic resonances observed in the strong-probe regime.},
doi = {10.1103/PHYSREVA.72.0},
journal = {Physical Review. A},
number = 6,
volume = 72,
place = {United States},
year = {Thu Dec 15 00:00:00 EST 2005},
month = {Thu Dec 15 00:00:00 EST 2005}
}
  • The effect a perturbing field has on an electromagnetically induced transparency within a three-level {lambda} system is presented. The perturbing field is applied resonant between one of the lower levels of the {lambda} system and a fourth level. The electromagnetically induced transparency feature is split and this is measured experimentally for both single and bichromatic driving fields. In the single-driving-field case a density matrix treatment is shown to be in reasonable agreement with experiment and in both single and bichromatic cases the structure in the spectrum can be explained using a dressed-state analysis.
  • We study the steady optical response of a five-level atomic system in the parametric region where resonant two-photon transitions are much stronger than far-detuned single-photon transitions. We find that the concurrent absorption of two weak probe fields can be well suppressed in a narrow spectral region to attain electromagnetically induced transparency (EIT) via quantum destructive interference between different two-photon transition pathways. To gain a deeper insight into relevant physics, we adiabatically reduce this five-level system with trivial single-photon transitions into a three-level system with vanishing single-photon transitions by deriving an effective Hamiltonian. The two systems have almost the same two-photonmore » absorption spectra exhibiting typical EIT features but are a little different in fine details. This means that most characteristics of two-photon quantum destructive interference are reserved after the adiabatic elimination approximation. In addition, we verify by numerical calculations that the two-photon EIT spectra are insensitive to the dipole-dipole interaction of cold Rydberg atoms when the uppermost level has a high principle quantum number.« less
  • Following our previous brief report [Phys. Rev. Lett. 88, 173003 (2002)], we report here a detailed study of electromagnetically induced transparency (EIT) and dark fluorescence in a cascade three-level diatomic lithium system using optical-optical double resonance (OODR) spectroscopy for both resonance and off resonance coupling. When a strong coupling laser couples the intermediate state A {sup 1}{sigma}{sub u}{sup +}(v=13,J=14) to the upper state G {sup 1}{pi}{sub g}(v=11,J=14) of {sup 7}Li{sub 2}, the fluorescence from both A {sup 1}{sigma}{sub u}{sup +} and G {sup 1}{pi}{sub g} states was drastically reduced as the weak probe laser was tuned through the resonance transitionmore » between the ground state X {sup 1}{sigma}{sub g}{sup +}(v=4,J=15) and the excited state A {sup 1}{sigma}{sub u}{sup +}(v=13,J=14). The strong coupling laser makes an optically thick medium transparent for the probe transition. In addition, the fact that fluorescence from the upper state G {sup 1}{pi}{sub g}(v=11,J=14) was also dark when both lasers were tuned at resonance implies that the molecules were trapped in the ground state. We used density matrix methods to simulate the response of an open molecular three-level system to the action of a strong coupling field and a weak probe field. The analytical solutions were obtained under the steady-state condition. We have incorporated the magnetic sublevel (M) degeneracy of the rotational levels in the line shape analysis and report |M| dependent line shape splitting. Our theoretical calculations are in excellent agreement with the observed fluorescence spectra. We show that the coherence is remarkably preserved even when the coupling field was detuned far from the resonance.« less
  • Laser cooling is theoretically investigated in a cascade three-level scheme, where the excited state of a laser-driven transition is coupled by a second laser to a top, more stable level, as for alkaline-earth-metal atoms. The second laser action modifies the atomic scattering cross section and produces temperatures lower than those reached by Doppler cooling on the lower transition. When multiphoton processes due to the second laser are relevant, an electromagnetic-induced transparency modifies the absorption of the first laser, and the final temperature is controlled by the second laser parameters. When the intermediate state is only virtually excited, the dynamics ismore » dominated by the two-photon process and the final temperature is determined by the spontaneous decay rate of the top state.« less
  • We investigate the four-wave mixing (FWM) phenomenon in a three-level bichromatic electromagnetically induced transparency system. Theoretical results predict that the FWM will exhibit a multipeak structure under bichromatic coupling fields. The stronger the coupling fields are, the more FWM the peaks should exhibit. Results of an experiment carried out with cold {sup 87}Rb atoms in a magneto-optical trap agree with the theoretical prediction.