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Auzinsh, M.; Ferber, R.; Gahbauer, F.; Jarmola, Andrey; Kalvans, L.

doi:10.1103/physreva.79.053404

Cited by 29 publications

(35 citation statements)

References 31 publications

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“…In time, detailed frameworks suitable for numerical integration were developed (see, for example, [18,19]). Detailed agreement between theoretical and experimental signals for nonlinear magneto-optical resonances were presented, for example, in [20,21].…”

Section: Introductionmentioning

confidence: 75%

Conversion of bright magneto-optical resonances into dark resonances at fixed laser frequency forD2excitation of atomic rubidium

et al. 2012

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Nonlinear magneto-optical resonances on the hyperfine transitions belonging to the D2 line of rubidium were changed from bright to dark resonances by changing the laser power density of the single exciting laser field or by changing the vapor temperature in the cell. In one set of experiments atoms were excited by linearly polarized light from an extended cavity diode laser with polarization vector perpendicular to the light's propagation direction and magnetic field, and laser induced fluorescence (LIF) was observed along the direction of the magnetic field, which was scanned. A low-contrast bright resonance was observed at low laser power densities when the laser was tuned to the Fg = 2 −→ Fe = 3 transition of 87 Rb and near to the Fg = 3 −→ Fe = 4 transition of 85 Rb. The bright resonance became dark as the laser power density was increased above 0.6mW/cm 2 or 0.8 mW/cm 2 , respectively. When the Fg = 2 −→ Fe = 3 transition of 87 Rb was excited with circularly polarized light in a second set of experiments, a bright resonance was observed, which became dark when the temperature was increased to around 50 o C. The experimental observations at room temperature could be reproduced with good agreement by calculations based on a theoretical model, although the theoretical model was not able to describe measurements at elevated temperatures, where reabsorption was thought to play a decisive role. The model was derived from the optical Bloch equations and included all nearby hyperfine components, averaging over the Doppler profile, mixing of magnetic sublevels in the external magnetic field, and a treatment of the coherence properties of the exciting radiation field.

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Section: Introductionmentioning

confidence: 75%

Conversion of bright magneto-optical resonances into dark resonances at fixed laser frequency forD2excitation of atomic rubidium

et al. 2012

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“…Then, we planned to apply to these data a theoretical model that had been developed to describe nonlinear magneto-optical resonances in ordinary vapor cells [8,9], to see if we could obtain an adequate theoretical description of bright and dark resonances in ETCs with this model.…”

Section: Introductionmentioning

confidence: 99%

“…Our initial approach [8,9] to the difficulties in describing bright and dark resonances in atomic vapors was to develop further a theoretical model [15] that would take into account the Doppler effect. Besides averaging over the Doppler profile, the model also accounted for all nearby hyperfine transitions, the splitting and mixing of the magnetic sublevels in the magnetic field, and the coherence properties of the laser radiation.…”

Section: Introductionmentioning

confidence: 99%

“…Besides averaging over the Doppler profile, the model also accounted for all nearby hyperfine transitions, the splitting and mixing of the magnetic sublevels in the magnetic field, and the coherence properties of the laser radiation. We applied such a model first to the cesium D 1 transition [8], which is almost resolved under Doppler broadening, and then to the rubidium D 1 transition [9], which is partially resolved. The model was successful in describing experimentally measured resonances in ordinary cells for a wide variety of laser power densities, beam diameters, and laser frequency detunings.…”

Section: Introductionmentioning

confidence: 99%

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Nonlinear magneto-optical resonances atD1excitation ofRb85and
Auzinsh
¹
,
Ferber
²
,
Gahbauer
³

et al. 2010
Phys. Rev. A
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Nonlinear magneto-optical resonances have been measured in an extremely thin cell (ETC) for the D1 transition of rubidium in an atomic vapor of natural isotopic composition. All hyperfine transitions of both isotopes have been studied for a wide range of laser power densities, laser detunings, and ETC wall separations. Dark resonances in the laser induced fluorescence (LIF) were observed as expected when the ground state total angular momentum Fg was greater than or equal to the excited state total angular momentum Fe. Unlike the case of ordinary cells, the width and contrast of dark resonances formed in the ETC dramatically depended on the detuning of the laser from the exact atomic transition. A theoretical model based on the optical Bloch equations was applied to calculate the shapes of the resonance curves. The model, which had been developed previously for ordinary vapor cells, averaged over the contributions from different atomic velocity groups, considered all neighboring hyperfine transitions, took into account the splitting and mixing of magnetic sublevels in an external magnetic field, and included a detailed treatment of the coherence properties of the laser radiation. Such a theoretical approach had successfully described nonlinear magneto-optical resonances in ordinary vapor cells. However, to describe the resonances in the ETC, key parameters such as the ground state relaxation rate, exited state relaxation rate, Doppler width, and Rabi frequency had to be modified significantly in accordance with the ETC's unique features. The level of agreement between the measured and calculated resonance curves achieved for the ETC was similar to what could be accomplished for ordinary cells. However, in the case of the ETC, it was necessary to fine-tune parameters such as the background and the Rabi frequency for different transitions, whereas for the ordinary cells, these parameters were identical for all transitions.

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“…2. The experiment has been described elsewhere along with comparison to an earlier version of the theoretical model that did not divide the laser beam into separate regions [29]. The laser was an extended cavity diode laser, whose frequency could be scanned by applying a voltage to a piezo crystal attached to the grating.…”

Section: Methodsmentioning

confidence: 99%

Spatial dynamics of laser-induced fluorescence in an intense laser beam: An experimental and theoretical study with alkali-metal atoms

et al. 2016

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We have shown that it is possible to model accurately optical phenomena in intense laser fields by taking into account the intensity distribution over the laser beam. We developed a theoretical model that divided an intense laser beam into concentric regions, each with a Rabi frequency that corresponds to the intensity in that region, and solved a set of coupled optical Bloch equations for the density matrix in each region. Experimentally obtained magneto-optical resonance curves for the Fg = 2 −→ Fe = 1 transition of the D1 line of 87 Rb agreed very well with the theoretical model up to a laser intensity of around 200 mW/cm 2 for a transition whose saturation intensity is around 4.5 mW/cm 2 . We have studied the spatial dependence of the fluorescence intensity in an intense laser beam experimentally and theoretically. An experiment was conducted whereby a broad, intense pump laser excited the Fg = 4 −→ Fe = 3 transition of the D2 line of cesium while a weak, narrow probe beam scanned the atoms within the pump beam and excited the D1 line of cesium, whose fluorescence was recorded as a function of probe beam position. Experimentally obtained spatial profiles of the fluorescence intensity agreed qualitatively with the predictions of the model.

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Nonlinear magneto-optical resonances atD1excitation ofR85band
M. Auzinsh
¹
,
R. Ferber
²
,
F. Gahbauer
³

et al.

Cited by 29 publications

References 31 publications

Conversion of bright magneto-optical resonances into dark resonances at fixed laser frequency forD2excitation of atomic rubidium

Conversion of bright magneto-optical resonances into dark resonances at fixed laser frequency forD2excitation of atomic rubidium

Nonlinear magneto-optical resonances atD1excitation ofRb85and
Auzinsh
¹
,
Ferber
²
,
Gahbauer
³

et al. 2010
Phys. Rev. A
Self Cite

Spatial dynamics of laser-induced fluorescence in an intense laser beam: An experimental and theoretical study with alkali-metal atoms

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Nonlinear magneto-optical resonances atD1excitation ofR85bandM. Auzinsh1, R. Ferber2, F. Gahbauer3 et al.

Cited by 29 publications

References 31 publications

Conversion of bright magneto-optical resonances into dark resonances at fixed laser frequency forD2excitation of atomic rubidium

Conversion of bright magneto-optical resonances into dark resonances at fixed laser frequency forD2excitation of atomic rubidium

Nonlinear magneto-optical resonances atD1excitation ofRb85andAuzinsh1, Ferber2, Gahbauer3 et al. 2010Phys. Rev. ASelf Cite

Spatial dynamics of laser-induced fluorescence in an intense laser beam: An experimental and theoretical study with alkali-metal atoms

Contact Info

Product

Resources

About

Nonlinear magneto-optical resonances atD1excitation ofR85band
M. Auzinsh
¹
,
R. Ferber
²
,
F. Gahbauer
³

et al.

Nonlinear magneto-optical resonances atD1excitation ofRb85and
Auzinsh
¹
,
Ferber
²
,
Gahbauer
³

et al. 2010
Phys. Rev. A
Self Cite