Optical Free Induction Decay in Cold<sup>85</sup>Rb Atoms

Shim, U.; Cahn, S. B.; Kumarakrishnan, A.; Sleator, Tycho; Kim, Jin Tae

doi:10.1143/jjap.41.3688

Cited by 10 publications

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“…3(b) of [26] where the transition is Doppler broadened, and Fig. 5 of [24] where Doppler broadening can be ignored]. In our experiments, g(kv/Γ) ≈ 0.16; thus, for bv(0) = 19(2), we get b 0 (0) = 120 (10).…”

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confidence: 48%

Cooperative Emission of a Pulse Train in an Optically Thick Scattering Medium

et al. 2015

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An optically thick cold atomic cloud emits a coherent flash of light in the forward direction when the phase of an incident probe field is abruptly changed. Because of cooperativity, the duration of this phenomena can be much shorter than the excited lifetime of a single atom. Repeating periodically the abrupt phase jump, we generate a train of pulses with short repetition time, high intensity contrast and high efficiency. In this regime, the emission is fully governed by cooperativity even if the cloud is dilute.

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confidence: 48%

Cooperative Emission of a Pulse Train in an Optically Thick Scattering Medium

et al. 2015

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“…Recently, optical FID with long coherence time generated using cold atoms has been reported [33,34]. Measuring these optical coherent transients in the time domain has become an important approach in studying atomic and molecular spectroscopy which are complementary to those made in the frequency domain [35].…”

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confidence: 99%

Optical coherent transients in cold atoms: From free-induction decay to optical precursors

et al. 2010

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We report theoretical and experimental studies of the propagation of a square-modulated laser pulse through a laser-cooled atomic ensemble of two-level absorbers, as well as through a three-level system with electromagnetically induced transparency. We find that the transmission characteristics over a wide range of optical depth can be fully accounted for as optical coherent transients excited by the wide spectral content of the square-modulated optical pulse. We show that both time-domain atom-field coupled equations and frequency-domain linear dispersion theory give precisely the same description of the optical transients at a weak power limit. At low optical depth with moderate absorption, resonant excitation dominates and free-induction decay (FID) contributes mostly to the transient field. At high optical depth when absorption and propagation effects become significant, lossless optical precursors start to dominate the transient response. By varying the optical depth from 0 to 45, we observe that optical transients evolve gradually from FID to optical precursors. We thus show that FID and optical precursors, which have been considered as two different optical transients for many decades, can be unified within a single theoretical frame and they are the manifestations of the same physical process in two different regimes.

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“…In the optical domain, observation of FID in an optically thin medium was reported on a molecular thermal gas [2,3]. More recently, optical FID in a cold cloud of rubidium gas, without inhomogeneous broadening, was also observed and compared with Maxwell-Bloch equations in the zero temperature limit [4][5][6][7]. In this letter, FID in an optically thick medium is studied, with emphasis on the effect of the optical thickness and temperature.…”

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Coherent flash of light emitted by a cold atomic cloud

et al. 2011

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When a resonant laser sent on an optically thick cold atomic cloud is abruptly switched off, a coherent flash of light is emitted in the forward direction. This transient phenomenon is observed due to the highly resonant character of the atomic scatterers. We analyze quantitatively its spatio-temporal properties and show very good agreement with theoretical predictions. Based on complementary experiments, the phase of the coherent field is reconstructed without interferometric tools.Comment: Submitted to Phys. Rev. Let

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Optical Free Induction Decay in Cold⁸⁵Rb Atoms

Cited by 10 publications

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Cooperative Emission of a Pulse Train in an Optically Thick Scattering Medium

Cooperative Emission of a Pulse Train in an Optically Thick Scattering Medium

Optical coherent transients in cold atoms: From free-induction decay to optical precursors

Coherent flash of light emitted by a cold atomic cloud

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Optical Free Induction Decay in Cold85Rb Atoms

Cited by 10 publications

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Cooperative Emission of a Pulse Train in an Optically Thick Scattering Medium

Cooperative Emission of a Pulse Train in an Optically Thick Scattering Medium

Optical coherent transients in cold atoms: From free-induction decay to optical precursors

Coherent flash of light emitted by a cold atomic cloud

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Optical Free Induction Decay in Cold⁸⁵Rb Atoms