Electromagnetically Induced Transparency in Rubidium Atoms: Enhancement of Four-Wave Mixing
01 Jan 1996-pp 455-456
TL;DR: In this paper, an experiment on enhancement of non-degenerate four-wave mixing (NDFWM) using EIT in a lambda-type three-level system of rubidium atoms was reported.
Abstract: CW-electromagnetically induced transparency (EIT) has been observed both in a lambda-type1 and a ladder-type2 three-level system of rubidium atoms. In particular, quantum interference of life-time broadened dressed states has been observed directly and dispersion properties of EIT were measured.1,2 In this paper, we report an experiment on enhancement of non-degenerate four-wave mixing (NDFWM) using EIT in a lambda-type three-level system of rubidium atoms.
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01 Jan 2013
Abstract: This thesis mainly focuses on the experimental investigations of electromagnetically induced transparency (EIT) related phenomena in various systems involving multilevel atoms inside an optical ring cavity. Semiclassical methods, e.g. density-matrix equations, are used through out this thesis to simulate the experimental results. First, the cavity transmission spectrum can be significantly modified when multilevel atoms are placed inside an optical ring cavity. Such coupled atom-cavity systems are well explained by the intracavity dispersion/absorption properties. Specifically, three-level lambda-type, four-level N-type and double-lambda-type atoms inside an optical ring cavity are investigated by examining their cavity transmission spectra. Second, optical multistability (OM) has been demonstrated with EIT atoms inside an optical ring cavity. Such OM has been utilized to realize a controllable optical multistate switch, which can be modeled as a triple-well system. Third, self-Kerr nonlinearities of multilevel atoms are measured in an optical ring cavity by scanning the cavity length. Fourth, bright Stokes and anti-Stokes fields are generated simultaneously in a doubly-resonant atomic optical parametric oscillator (AOPO). In addition, vacuum-induced absorption and noise correlations are studied in the AOPO system. Last, a theoretical model is proposed to realize parity-time (PT) symmetry in a four-level N-type atomic system by spatially modifying the complex refractive index in free space. Moreover, the experimental progress is made to observe discrete diffraction pattern in an optically induced lattice by interfering with plane waves in a coherent atomic medium.
7 citations
Cites background from "Electromagnetically Induced Transpa..."
...4 has served as an important system in EIT-based FWM, because the FWM efficiency is dramatically improved due to the enhanced third-order nonlinearity by EIT [33]....
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...7 double-lambda configuration in atoms [31-42], as illustrated in Fig....
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...Moreover, by adding more light fields to drive additional atomic transitions based on the principal lambda scheme, a variety of other interesting schemes will emerge, such as N-type [17-27], M-type [28], inverted-Y-type [29], tripod-type [30], double-lambda-type [31-42], etc....
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References
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TL;DR: In this paper, a strong coupling field between a metastable state and the upper state of an allowed transition to ground was proposed to obtain a resonantly enhanced third-order susceptibility while at the same time inducing transparency of the media.
Abstract: We show that by applying a strong-coupling field between a metastable state and the upper state of an allowed transition to ground one may obtain a resonantly enhanced third-order susceptibility while at the same time inducing transparency of the media. An improvement in conversion efficiency and parametric gain, as compared to weak-coupling field behavior, of many orders of magnitude is predicted.
1,287 citations
Proceedings Article•
12 May 1991TL;DR: It is shown that by applying a strong-coupling field between a metastable state and the upper state of an allowed transition to ground one may obtain a resonantly enhanced third-order susceptibility while at the same time inducing transparency of the media.
Abstract: It is well known by those practicing the techniques of nonlinear optics that the power that may be generated in a frequency summing process and the gain that may be obtained in a parametric process are determined by the interaction of tire nonlinear and linear susceptibilities. In general as an atomic transition to the ground state is approached, the nonlinear susceptibility is resonantly enhanced, but at the same time the media exhibits a rapidly increasing refractive index and becomes opaque.
1,212 citations
TL;DR: In this paper, an electromagnetically induced transparency is observed at one arm of a three-level ε-Lambda-type system in a rubidium D1 line (794.8 nm) with an 85% reduction in absorption, when a pumping field is present at the other arm.
Abstract: An electromagnetically induced transparency is observed at one arm of a three-level \ensuremath{\Lambda}-type system in a rubidium D1 line (794.8 nm) with an 85% reduction in absorption, when a pumping field is present at the other arm. This reduction in absorption for the weak probe field is due to the atomic coherence produced by the strong pumping field. This experiment is done in a Rb vapor cell at room temperature with cw diode lasers for both pumping and probe beams in a Doppler-free configuration. A simple theoretical treatment including Doppler broadening is in good qualitative agreement with the experimental measurement.
175 citations
TL;DR: In this paper, a nonlinear optical generation using electromagnetically induced transparency is demonstrated with atomic hydrogen as a test medium, where the generated sum-frequency Lyman-β radiation at 103 nm can continue to grow without suffering resonant absorption and phase mismatching.
Abstract: Nonlinear optical generation using electromagnetically induced transparency is demonstrated with atomic hydrogen as a test medium. With the application of a strong-coupling laser field to the 3p-2s transition, the resonant Lyman-β (3p-1s) transition becomes transparent. The generated-sum-frequency Lyman-β radiation at 103 nm can continue to grow without suffering resonant absorption and phase mismatching
94 citations
TL;DR: A 64.4% reduction in absorption at the rubidium D2 line is observed when a pumping field at 775.8 nm is tuned on resonance to the transition between the excited states 5-5/2.
Abstract: A 64.4% reduction in absorption at the rubidium D2 line is observed when a pumping field at 775.8 nm is tuned on resonance to the transition between the excited states 5${\mathit{P}}_{3/2}$ and 5${\mathit{D}}_{5/2}$. As the pumping field is tuned off resonance, an absorption peak appears at the side of the Doppler-broadened D2 line. This modification in absorption is related to pumping-induced atomic coherence in this three-level ladder-type system. This experiment is done in a Rb vapor cell at room temperature and with cw diode lasers for both pumping and probe beams in a Doppler-free configuration.
51 citations