Collision-enhanced resonance of laser-diode-excited Cs in a buffer gas

Tomasi, F. De; Allegrini, M.; Arimondo, E.; Agarwal, G. S.; Ananthalakshmi, P.

doi:10.1103/physreva.48.3820

Cited by 17 publications

(4 citation statements)

References 18 publications

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“…The theoretical model used here is based on the ones reported in [4] and [5] adapted for the particular case of potassium. We consider a three-level scheme ( Fig.…”

Section: Theoretical Modelmentioning

confidence: 99%

Analysis of High Efficiency Electromagnetically Induced Transparency in Potassium Vapor

et al. 2009

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We present a rate-equation theoretical model describing the optical pumping processes on the K D 1 line and we then discuss their influence on the electromagnetically induced transparency resonance parameters. We present also a comparison with the results of an experiment performed in cells containing pure alkali metal or added with a few torrs of buffer gas. The model shows that, in the last case, the complete Maxwellisation of the atomic population velocity distribution, along with the overlapping Doppler profiles of the transitions from the ground-states typical of K, leads to a partial compensation of optical pumping and a significant increase of the amplitude of the electromagnetically induced transparency resonances.

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“…The theoretical model used here is based on the ones reported in [4] and [5] adapted for the particular case of potassium. We consider a three-level scheme ( Fig.…”

Section: Theoretical Modelmentioning

confidence: 99%

Analysis of High Efficiency Electromagnetically Induced Transparency in Potassium Vapor

et al. 2009

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“…) cause complete thermalization, as recently studied experimentally [12]. Under these assumptions we can write the rate equations for an ensemble of thermally populated states, in a model similar to that of [13]. The main difference of the present analysis is the inclusion of the hyperfine structure of the 6P J levels and of radiation trapping.…”

Section: Modelling Of the 6p J Atom Densitymentioning

confidence: 96%

Experimental study of caesium energy pooling collisions and modelling of the excited atom density in the presence of optical pumping and radiation trapping

Tomasi

Milošević

Verkerk

et al. 1997

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

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An experimental study of caesium energy pooling collisions, , at thermal energies, has been carried out in a capillary cell using diode laser excitation. Use of the capillary cell minimizes the effects of radiation trapping, but nonetheless, such effects still play a significant role in the analysis. Consequently, a rate equation model, which treats simultaneous effects of saturation, optical pumping, and radiation trapping, has been developed and is used to determine the atom density under these experimental conditions. The excited atom densities are combined with measured fluorescence ratios to determine rate coefficients for the caesium energy pooling process. Our values for these rate coefficients are in agreement, within combined error bars, with values we have recently obtained under very different experimental conditions.

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“…These methods also provide a more realistic and numerically convenient way to model laboratory experiments with VSOP of atoms in low-pressure buffer gases. In contrast to previous work on this topic, for example references [2][3][4], we account for the full hyperfine structure of real alkali-metal atoms, we show how to use spin-relaxation modes [5,6] to incorporate into the model the complicated spin relaxation of Na guidestar atoms due to collisions with paramagnetic oxygen atoms, and we use recently developed cusp kernels [7] to realistically and efficiently model velocity-changing collisions.…”

Section: Introductionmentioning

confidence: 99%

Spin-velocity correlations of optically pumped atoms

Marsland,

McGuyer,

Olsen

et al. 2013

Preprint

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We present efficient theoretical tools for describing the optical pumping of atoms by light propagating at arbitrary directions with respect to an external magnetic field, at buffer-gas pressures that are small enough for velocity-selective optical pumping (VSOP) but large enough to cause substantial collisional relaxation of the velocities and the spin. These are the conditions for the sodium atoms at an altitude of about 100 km that are used as guidestars for adaptive optics in modern ground-based telescopes to correct for aberrations due to atmospheric turbulence. We use spin and velocity relaxation modes to describe the distribution of atoms in spin space (including both populations and coherences) and velocity space. Cusp kernels are used to describe velocity-changing collisions. Optical pumping operators are represented as a sum of poles in the complex velocity plane. Signals simulated with these methods are in excellent agreement with previous experiments and with preliminary experiments in our laboratory.

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Collision-enhanced resonance of laser-diode-excited Cs in a buffer gas

Cited by 17 publications

References 18 publications

Analysis of High Efficiency Electromagnetically Induced Transparency in Potassium Vapor

Analysis of High Efficiency Electromagnetically Induced Transparency in Potassium Vapor

Experimental study of caesium energy pooling collisions and modelling of the excited atom density in the presence of optical pumping and radiation trapping

Spin-velocity correlations of optically pumped atoms

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