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

Abstract

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.

Authors:
; ;  [1]
  1. Laser Physics Center, Research School of Physical Sciences and Engineering, Australian National University, Canberra, Australian Capital Territory, 0200 (Australia)
Publication Date:
OSTI Identifier:
20786377
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. A; Journal Volume: 72; Journal Issue: 6; Other Information: DOI: 10.1103/PhysRevA.72.063814; (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; ENERGY LEVELS; ENERGY SPECTRA; OPACITY; OPTICS; QUANTUM MECHANICS

Citation Formats

Wilson, E. A., Manson, N. B., and Wei, C. Perturbing an electromagnetically induced transparency in a {lambda} system using a low-frequency driving field. II. Four-level system. United States: N. p., 2005. Web. doi:10.1103/PHYSREVA.72.0.
Wilson, E. A., Manson, N. B., & Wei, C. Perturbing an electromagnetically induced transparency in a {lambda} system using a low-frequency driving field. II. Four-level system. United States. doi:10.1103/PHYSREVA.72.0.
Wilson, E. A., Manson, N. B., and Wei, C. Thu . "Perturbing an electromagnetically induced transparency in a {lambda} system using a low-frequency driving field. II. Four-level system". United States. doi:10.1103/PHYSREVA.72.0.
@article{osti_20786377,
title = {Perturbing an electromagnetically induced transparency in a {lambda} system using a low-frequency driving field. II. Four-level system},
author = {Wilson, E. A. and Manson, N. B. and Wei, C.},
abstractNote = {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.},
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}
}
  • 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 withmore » 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.« less
  • 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
  • We report experimental observations on the simultaneous electromagnetically induced transparency (EIT) effects for probe and trigger fields (double EIT) as well as the enhanced cross-phase modulation (XPM) between the two fields in a four-level tripod EIT system of the D1 line of {sup 87}Rb atoms. The XPM coefficients (larger than 2x10{sup -5} cm{sup 2}/W) and the accompanying transmissions (higher than 60%) are measured at a slight detuning of the probe field from the exact EIT-resonance condition. The system and enhanced cross-Kerr nonlinearities presented here can be applied to quantum information processes.
  • 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.
  • Electromagnetic induced transparency (EIT) can be produced in a four-level atomic system in the W scheme using a linearly polarized optical field for simultaneously slowing down two {sigma}{sup +} and {sigma}{sup -} circularly polarized optical fields. This four-level atomic system can be set up with a |{sup 1}S{sub 0}> ground state and three Zeeman levels of the |{sup 1}P{sub 1}> excited state of any alkali-metal atom placed in a weak magnetic field. We apply our W scheme to ultracold magnesium atoms for neglecting the collisional dephasing. Atomic coherences are reported after solving a density matrix master equation including radiative relaxationsmore » from Zeeman states of the |{sup 1}P{sub 1}> multiplet to the |{sup 1}S{sub 0}> ground state. The EIT feature is analyzed using the transit time between the normal dispersive region and the EIT region. The evolution of the EIT feature with the variation of the coupling field is discussed using an intuitive dressed-state representation. We analyze the sensitivity of an EIT feature to pressure broadening of the excited Zeeman states.« less