Light amplification through collective atomic recoil motion modified by a harmonic potential

Yang, Guojian; Zhang, L.; Shu, W.

doi:10.1103/physreva.68.063802

Cited by 4 publications

(6 citation statements)

References 20 publications

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“…Therefore, the steady-state CARLs were proposed and have been experimentally demonstrated [8][9], but, with a relative weak gain. In this paper, we report a result in order to give a more detailed theoretical analysis to a modified CARL system [10] which produces a CW laser output with a higher gain. In our previous scheme, the active cold atoms are trapped in a harmonic potential, which can be realized by loading the atoms into an optical lattice or an overall magnetic trap, instead of introducing a light molasses [9] [11] or adding a thermal collision/momentum damping mechanism to the atomic motion [6].…”

Section: Introduction and Simulation Resultsmentioning

confidence: 99%

“…The coefficient (1 − e −κτ )/κ of Eq. (10) shows here that when the damping rate κ is small enough and the evolution time τ ≫ 1/κ, the intensity gain of the probe field will be extremely high in the neighborhood of ∆ 21 = nν, and thus results in a uniform discrete gain structure as shown in Fig.2 simulated directly on Eq.(2). Although the Raman gain condition will not be changed if the higher harmonic components of Eq.…”

Section: ∆20mentioning

confidence: 98%

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Self-organization effects and light amplification of collective atomic recoil motion in a harmonic trap

L.Zhang¹,

Yang²,

Xia³

2005

J. Opt. B: Quantum Semiclass. Opt.

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Self-organization effects related to light amplification in the collective atomic recoil laser system with the driven atoms confined in a harmonic trap are investigated further. In the dispersive parametric region, our study reveals that the spontaneously formed structures in the phase space contributes an important role to the light amplification of the probe field under the atomic motion being modified by the trap.

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Section: Introduction and Simulation Resultsmentioning

confidence: 99%

Section: ∆20mentioning

confidence: 98%

Self-organization effects and light amplification of collective atomic recoil motion in a harmonic trap

L.Zhang¹,

Yang²,

Xia³

2005

J. Opt. B: Quantum Semiclass. Opt.

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“…For our current purpose the high-Q cavity provides a low noise detection, which not only enhances atom-cavity coupling but also increases the sensitivity of measurement by a factor of 1/(1−R), where R is the reflectivity of cavity mirror [46]. Further, these requirements of the system enable a usage of Bonifacio's collective atomic recoil laser (CARL) model [47] to introduce an extra trapping potential [35] for the micro-trap on atom chip. Describing the two-level atomic gas with the Pauli spin operator σ 0 and their internal transitions byσ ± , pump and probe modes byâ 2 ,â 1 , the system Hamiltonian is [35],…”

Section: Model and Mechanismmentioning

confidence: 99%

“…Further, these requirements of the system enable a usage of Bonifacio's collective atomic recoil laser (CARL) model [47] to introduce an extra trapping potential [35] for the micro-trap on atom chip. Describing the two-level atomic gas with the Pauli spin operator σ 0 and their internal transitions byσ ± , pump and probe modes byâ 2 ,â 1 , the system Hamiltonian is [35],…”

Section: Model and Mechanismmentioning

confidence: 99%

“…In this paper, we demonstrate a high-gain pump-probe Raman spectrum on a trapped cold atomic ensemble [35] and propose a more convenient and sensitive method to diagnose micro-traps by using the coherent enhanced Raman spectrum in high finesse microcavity. Due to atomic recoil motion, atomic oscillations in the micro-trap will be actuated and closely entangled with resonant cavity modes through scattering in atomic absorption-emission cycles [29].…”

Section: Introductionmentioning

confidence: 99%

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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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Cooperative scattering of light and atoms in ultracold atomic gases

Uys

Meystre

2008

Laser Phys. Lett.

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Superradiance and coherent atomic recoil lasing are two closely related phenomena, both resulting from the cooperative scattering of light by atoms. In ultracold atomic gases below the critical temperature for Bose-Einstein condensation these processes take place with the simultaneous amplification of the atomic matter waves. We explore these phenomena by surveying some of the experimental and theoretical developments that have emerged in this field of study since the first observation of superradiant scattering from a Bose-Einstein condensate in 1999 [1]. A 1D simulation of the dynamic, periodic spatial bunching of atoms into a density grating leading to the cooperative scattering of light into a mode backward propagating with respect to a pump laser field off-resonantly driving a two-level atomic transition. (a) A characteristic pulse of backscattered light is observed simultaneously with (b) the spatial bunching of atoms, as evident from the periodic convergence of the semiclassical trajectories of 500 atoms initially randomly distributed over an interval −10 < z < 10 in units of wavelength of the light

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Light amplification through collective atomic recoil motion modified by a harmonic potential

Cited by 4 publications

References 20 publications

Self-organization effects and light amplification of collective atomic recoil motion in a harmonic trap

Self-organization effects and light amplification of collective atomic recoil motion in a harmonic trap

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

Cooperative scattering of light and atoms in ultracold atomic gases

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