Pump-probe spectroscopy in degenerate two-level atoms with arbitrarily strong fields

Zigdon, T.; Wilson-Gordon, A. D.; Friedmann, H.

doi:10.1103/physreva.77.033836

Cited by 16 publications

(17 citation statements)

References 17 publications

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“…Nevertheless the proposed method can still provide useful information about the intensity of the trapping potentials along a certain direction because of its opto-mechanical mechanism. The second approximation is related to the two-level assumption of the N trapped identical atoms which omits also the isotope fraction [32,41] and the hyperfine level structure [55,56] which could lead to different Raman resonant relations of Eq. (3) and results in an overlap of different groups of Raman peaks.…”

Section: Discussionmentioning

confidence: 99%

Opto-mechanical estimation of micro-trap with cold atoms via nonlinear stimulated Raman scattering spectrum

Zhang

2013

Appl. Phys. B

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High-gain resonant nonlinear Raman scattering on trapped cold atoms within a high-fineness ring optical cavity is simply explained under a nonlinear opto-mechanical mechanism, and a proposal using it to detect frequency of micro-trap on atom chip is presented. The enhancement of scattering spectrum is due to a coherent Raman conversion between two different cavity modes mediated by collective vibrations of atoms through nonlinear opto-mechanical couplings. The physical conditions of this technique are roughly estimated on Rubidium atoms, and a simple quantum analysis as well as a multi-body semiclassical simulation on this nonlinear Raman process is conducted.

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Section: Discussionmentioning

confidence: 99%

Opto-mechanical estimation of micro-trap with cold atoms via nonlinear stimulated Raman scattering spectrum

Zhang

2013

Appl. Phys. B

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“…To effectively control the properties of such media the spectral and temporal nonlinear processes occurring in them must be understood, since light-induced coherences as well as coherent oscillations of population significantly enhance their nonlinear susceptibility [4,5,6]. While Hanle-type and pump-probe spectral methods have been widely employed for investigations of coherent effects in atoms [1][2][3]7], we demonstrate that optical heterodyning offers a complementary approach for testing atomic media.…”

Section: Introductionmentioning

confidence: 99%

Probing degenerate two-level atomic media by coherent optical heterodyning

Akulshin¹,

McLean²,

Sidorov³

et al. 2011

J. Phys. B: At. Mol. Opt. Phys.

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Abstract. We analyze how light-induced coherent population oscillations and ground-state Zeeman coherence in an atomic medium with degenerate two-level transitions can modify spectra of applied cw resonant radiation at the sub-mW power level. The use of mutually coherent optical fields and heterodyne detection schemes allows spectral resolution at kHz level, well below the laser linewidth. We find that ground-state Zeeman coherence may facilitate nonlinear wave mixing while coherent population oscillations are responsible for phase and amplitude modulation of the applied fields. Conditions for the generation of new optical fields by nonlinear wave mixing in degenerate two-level atomic media are formulated.

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“…The excitedstate coherence only exists in systems where the coherent population trapping is incomplete so that there is some population in the excited state [9,10]. The transfer of this coherence to the ground state leads to a peak in the contribution of the ground-state two-photon coherence to the probe absorption at line center, instead of the dip that occurs in its absence (for example, in a Λ system or a non-degenerate N system) [11].…”

Section: Introductionmentioning

confidence: 99%

Effects of thermal motion on electromagnetically induced absorption

Tilchin¹,

Wilson-Gordon²,

Firstenberg³

2011

Phys. Rev. A

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We describe the effect of thermal motion and buffer-gas collisions on a four-level closed N system interacting with strong pump(s) and a weak probe. This is the simplest system that experiences electromagnetically induced absorption (EIA) due to transfer of coherence via spontaneous emission from the excited to ground state. We investigate the influence of Doppler broadening, velocitychanging collisions (VCC), and phase-changing collisions (PCC) with a buffer gas on the EIA spectrum of optically active atoms. In addition to exact expressions, we present an approximate solution for the probe absorption spectrum, which provides physical insight into the behavior of the EIA peak due to VCC, PCC, and wave-vector difference between the pump and probe beams. VCC are shown to produce a wide pedestal at the base of the EIA peak, which is scarcely affected by the pump-probe angular deviation, whereas the sharp central EIA peak becomes weaker and broader due to the residual Doppler-Dicke effect. Using diffusion-like equations for the atomic coherences and populations, we construct a spatial-frequency filter for a spatially structured probe beam and show that Ramsey narrowing of the EIA peak is obtained for beams of finite width.

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Pump-probe spectroscopy in degenerate two-level atoms with arbitrarily strong fields

Cited by 16 publications

References 17 publications

Opto-mechanical estimation of micro-trap with cold atoms via nonlinear stimulated Raman scattering spectrum

Opto-mechanical estimation of micro-trap with cold atoms via nonlinear stimulated Raman scattering spectrum

Probing degenerate two-level atomic media by coherent optical heterodyning

Effects of thermal motion on electromagnetically induced absorption

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