Coherent effects on the Zeeman sublevels of hyperfine states at the D<sub>1</sub>and D<sub>2</sub>lines of Rb

Alzetta, G.; Cartaleva, S.; Dancheva, Yordanka; Andreeva, C.; Gozzini, S.; Botti, L.; Rossi, A. R.

doi:10.1088/1464-4266/3/3/317

Cited by 46 publications

(26 citation statements)

References 10 publications

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“…EIA resonances may be suppressed when the coherence of the excited state is destroyed by collisions [22]. With the exception of EIA resulting from spontaneous coherent transfer in the resonance on an F g → * hrnoh@chonnam.ac.kr † hsmoon@pusan.ac.kr F e = F g + 1 transition, the absorption spectrum with a belownatural width occurs because of a collision-induced coherent effect, two-photon Raman resonance, and double--level configuration [23][24][25][26]. Recently, A. Huss et al reported both the width and the contrast of single-frequency level-crossing CPT resonances in the presence of an additional magnetic field orthogonal to the laser propagation direction [26].…”

Section: Introductionmentioning

confidence: 99%

Level-crossing absorption with narrow spectral width in Rb vapor with buffer gas

Lee

Bae

et al. 2010

Phys. Rev. A

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We present the transformation in the Hanle configuration of the transmission that results from coherent population trapping (CPT) into the level-crossing absorption (LCA) that results from the single-photon optical pumping in the 87 Rb D 1 line of a Rb vapor cell with a Ne buffer gas when the polarization of the laser field is changed from linear to circular. The LCA spectrum, with a narrow spectral width of 2.4 mG (1.7 kHz), was observed in the F g → F e F g transition with the circularly polarized laser. This may be because the LCA is both related to the transverse magnetic field and the atom-laser interaction time resulting from diffusive atomic motion in the cell with the buffer gas. The CPT and LCA spectra were calculated numerically using the full density matrix equations for the relevant magnetic sublevels of the hyperfine levels, considering the residual magnetic fields perpendicular to laser propagation and the collision effects resulting from the buffer gas. There was good qualitative agreement between theoretical and experimental results.

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Section: Introductionmentioning

confidence: 99%

Level-crossing absorption with narrow spectral width in Rb vapor with buffer gas

Lee

Bae

et al. 2010

Phys. Rev. A

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“…Bright resonances arise when atoms at zero magnetic field are prepared in a superposition of ground state sublevels that is strongly coupled to the excited state. These resonances have a variety of applications, such as in optical magnetometers [9] and optical switches [10], and they have been studied extensively in many systems both theoretically and experimentally (see, for example, [3,5,11,12,13,14,15,16,17,18,19,20,21]). However, accurately modelling the profiles of bright and dark resonances in systems that are unresolved under Doppler broadening remains a challenging enterprise.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear magneto-optical resonances atD1excitation ofR85band
Auzinsh
¹
,
Ferber
²
,
Gahbauer
³

et al. 2009
Phys. Rev. A

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Experimental signals of non-linear magneto-optical resonances at D1 excitation of natural rubidium in a vapor cell have been obtained and described with experimental accuracy by a detailed theoretical model based on the optical Bloch equations. The D1 transition of rubidium is a challenging system to analyze theoretically because it contains transitions that are only partially resolved under Doppler broadening. The theoretical model took into account all nearby transitions, the coherence properties of the exciting laser radiation, and the mixing of magnetic sublevels in an external magnetic field and also included averaging over the Doppler profile. Great care was taken to obtain accurate experimental signals and avoid systematic errors. The experimental signals were reproduced very well at each hyperfine transition and over a wide range of laser power densities, beam diameters, and laser detunings from the exact transition frequency. The bright resonance expected at the Fg = 1 → Fe = 2 transition of 87 Rb has been observed. A bright resonance was observed at the Fg = 2 → Fe = 3 transition of 85 Rb, but displaced from the exact position of the transition due to the influence of the nearby Fg = 2 → Fe = 2 transition, which is a dark resonance whose contrast is almost two orders of magnitude larger than the contrast of the bright resonance at the Fg = 2 → Fe = 3 transition. Even in this very delicate situation, the theoretical model described in detail the experimental signals at different laser detunings.

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“…5,6 It was also observed in the Hanle configuration. [7][8][9][10] For the case of perpendicularly polarized pump and probe lasers, EIA has been shown to be due to transfer of coherence (TOC), via spontaneous emission, from the excited state to the ground state. 11,12 In our first paper on EIA, 13 we gave a detailed explanation of why the TOC that leads to EIA can only take place in systems where ground-state population trapping does not occur, that is, when F e = F g + 1.…”

Section: Introductionmentioning

confidence: 99%

<title>Pump-probe spectroscopy in degenerate two-level atoms with arbitrarily strong fields</title>

et al. 2007

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We review our previous work on pump-probe spectroscopy in realistic degenerate two-level systems and model systems. In particular, we discuss the role of transfer of coherence (TOC) between the ground and excited hyperfine states in producing electromagnetically-induced transparency (EIA) peaks in the probe spectrum, when an F g → F e = F g + 1 transition in an alkali-metal atom interacts with a strong pump and weak probe that have perpendicular polarizations. When the pump is σ + polarized and the probe π polarized, this system can be modelled by an N system. We also discuss the role of transfer of population (TOP) between the Zeeman levels of the ground hyperfine state in producing EIA peaks when the pump and probe have the same polarization. This system can be modelled using a double two-level system. The role of Doppler broadening and phase-changing collisions in modifying the EIA-TOC and EIA-TOP absorption and refraction spectra is also discussed. All these spectra were calculated using MATLAB programs that both construct and solve the relevant Bloch equations. In our recent work, we consider the effect of a strong probe on the pump absorption and refraction spectra when the pump and probe polarizations are linear and perpendicular. It is difficult to solve this problem numerically due to the large number frequencies involved. In order to simplify the problem, we considered two cases: (i) σ + polarized pump and π polarized probe, and (ii) σ + polarized pump and σ − polarized probe, and investigated a series of transitions in both Rb and Cs, using modified versions of the MATLAB programs devised for the weakprobe case. A number of interesting differences from the weak-probe case were found. For example, when the probe is sufficiently strong, we found the pump and probe spectra to show complementary behavior. In addition, as the number of Zeeman levels increase, the EIA peaks become progressively sharper, and are accompanied by steeper dispersion.

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Coherent effects on the Zeeman sublevels of hyperfine states at the D₁and D₂lines of Rb

Cited by 46 publications

References 10 publications

Level-crossing absorption with narrow spectral width in Rb vapor with buffer gas

Level-crossing absorption with narrow spectral width in Rb vapor with buffer gas

Nonlinear magneto-optical resonances atD1excitation ofR85band
Auzinsh
¹
,
Ferber
²
,
Gahbauer
³

et al. 2009
Phys. Rev. A

<title>Pump-probe spectroscopy in degenerate two-level atoms with arbitrarily strong fields</title>

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Coherent effects on the Zeeman sublevels of hyperfine states at the D1and D2lines of Rb

Cited by 46 publications

References 10 publications

Level-crossing absorption with narrow spectral width in Rb vapor with buffer gas

Level-crossing absorption with narrow spectral width in Rb vapor with buffer gas

Nonlinear magneto-optical resonances atD1excitation ofR85bandAuzinsh1, Ferber2, Gahbauer3 et al. 2009Phys. Rev. A

<title>Pump-probe spectroscopy in degenerate two-level atoms with arbitrarily strong fields</title>

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Coherent effects on the Zeeman sublevels of hyperfine states at the D₁and D₂lines of Rb

Nonlinear magneto-optical resonances atD1excitation ofR85band
Auzinsh
¹
,
Ferber
²
,
Gahbauer
³

et al. 2009
Phys. Rev. A