Absorption of resonance radiation and fluorescence of a layer of an atomic gas with thickness of the order of a wavelength

Nikogosyan, G.; Sarkisyan, D.; Malakyan, Yu.

doi:10.1364/jot.71.000602

Cited by 16 publications

(19 citation statements)

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“…The numerical calculations confirm the experimental observation that lineshapes are expected to be narrower in fluorescence than in absorption in comparable conditions [4,7,13]. Also, the width of the fluorescence profile is expected to increase continuously with the cell thickness, without an interferometric Dicke-type narrowing, and to reach a Doppler-broadened lineshape for longer cells with the velocity selection getting less stringent.…”

Section: Predictions For the Fluorescence Behaviorsupporting

confidence: 77%

“…These results extend those of [6,7,12], evidencing the coherent Dicke narrowing; they are however obtained in an intensity range higher than the one (<< 1mW/cm 2 ) ensuring a genuine linear behavior. At high intensities, the sub-Doppler resonances appear significantly broadened, and saturation effects tend to washout the Dicke coherent narrowing [13], which is well-pronounced at low power: one can notice in Fig.2 that the absorption peaks are strongly reduced for high intensities, but that the wings are nearly unaffected. Figure 3 shows the typical evolution of the absorption spectrum for L = λ with the irradiating intensity (only the F g = 4 → F e = {3, 4, 5} set is shown, but a similar behavior is observed for the F g = 3 → F e = {2, 3, 4} transitions).…”

Section: A Sub-doppler Resonances In Absorptionmentioning

confidence: 89%

“…The systematic modelling of the fluorescence response in the context of ETC has never been reported. In [13], fluorescence spectra in ETCs are calculated, but they mostly aim at the specific description of the multi-level Rb transition.…”

Section: Discussion and Interpretation With A Theoretical Modellingmentioning

confidence: 99%

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Saturation effects in the sub-Doppler spectroscopy of cesium vapor confined in an extremely thin cell

et al. 2007

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Saturation effects affecting absorption and fluorescence spectra of an atomic vapor confined in an Extremely Thin Cell (cell thickness L < 1µm) are investigated experimentally and theoretically. The study is performed on the D2 line (λ = 852nm) of Cs and concentrates on the two situations L = λ/2 and L = λ, the most contrasted ones with respect to the length dependence of the coherent Dicke narrowing. For L = λ/2, the Dicke-narrowed absorption profile simply broadens and saturates in amplitude when increasing the light intensity, while for L = λ, sub-Doppler dips of reduced absorption at line-center appear on the broad absorption profile. For a fluorescence detection at L = λ, saturation induces narrow dips, but only for hyperfine components undergoing a population loss through optical pumping. These experimental results are interpreted with the help of the various existing models, and are compared with numerical calculations based upon a two-level modelling that considers both a closed and an open system.

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Section: Predictions For the Fluorescence Behaviorsupporting

confidence: 77%

Section: A Sub-doppler Resonances In Absorptionmentioning

confidence: 89%

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Saturation effects in the sub-Doppler spectroscopy of cesium vapor confined in an extremely thin cell

et al. 2007

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“…The model is close to the one described in [29]. We consider a three-level model with the states assigned to the real states of the D 1 line 4S 1/2 → 4P 1/2 of potassium atom (see the inset in Fig.…”

Section: Theoretical Modelmentioning

confidence: 99%

“…Inserting formulas (8), (9), (12) to Eq. (11) one gets for the Doppler broadened absorption profile [29] 1…”

Section: Theoretical Modelmentioning

confidence: 99%

Collapse and revival of a Dicke-type coherent narrowing in potassium vapor confined in a nanometric thin cell

Sargsyan

Pashayan-Leroy

Leroy

et al. 2016

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

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Abstract. A nanometer-thin-cell (in the direction of laser beam propagation) has been elaborated with the thickness of the atomic vapor column varying smoothly in the range of L = 50 − 1500 nm. The cell allows one to study the behavior of the resonance absorption over the D 1 line of potassium atoms by varying the laser intensity and the cell thickness from L = λ/2 to L = 2λ with the step λ/2 (λ = 770 nm is the resonant wavelength of the laser). It is shown that despite the huge Doppler broadening (> 0.9 GHz at the cell temperature 170• C), at low laser intensities a narrowing of the resonance absorption spectrum is observed for L = λ/2 (∼ 120 MHz at FWHM) and L = 3/2λ, whereas for L = λ and L = 2λ the spectrum broadens. At moderate laser intensities narrowband velocity selective optical pumping (VSOP) resonances appear at L = λ and L = 2λ with the linewidth close to the natural one. A comparison with saturated absorption spectra obtained in a 1-cm-sized K cell is presented. The developed theoretical model well describes the experiment.

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Saturated absorption spectrum of cesium micrometric-thin cell with suppressed crossover spectral lines

et al. 2023

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Micrometric-thin cells (MCs) with alkali vapor atoms have been valuable for research and applications of hyperfine Zeeman splitting and atomic magnetometers under strong magnetic fields. In this paper, the saturated absorption spectra using a 100-μm cesium MC are studied theoretically and experimentally, where the pump and probe beams are linearly polarized beams with mutually perpendicular polarizations, and the magnetic field is along the pump beam. Because of the distinctive thin chamber of the MC, crossover spectral lines in saturated absorption spectra are largely suppressed leading to clear splittings of hyperfine Zeeman transitions in experiments, and the effect of spatial magnetic field gradient is expected to be reduced. A calculation method is proposed to achieve good agreements between theoretical calculations and experimental results. This method successfully explains the suppression of crossover lines in MCs, as well as the effects of magnetic field direction, propagation and polarization directions of the pump/probe beam on saturated absorption spectrum. The saturated absorption spectrum with suppressed crossover lines is used for laser frequency stabilization, which may provide the potential value of MCs for high spatial resolution strong-field magnetometry with high sensitivity.

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Absorption of resonance radiation and fluorescence of a layer of an atomic gas with thickness of the order of a wavelength

Cited by 16 publications

References 0 publications

Saturation effects in the sub-Doppler spectroscopy of cesium vapor confined in an extremely thin cell

Saturation effects in the sub-Doppler spectroscopy of cesium vapor confined in an extremely thin cell

Collapse and revival of a Dicke-type coherent narrowing in potassium vapor confined in a nanometric thin cell

Saturated absorption spectrum of cesium micrometric-thin cell with suppressed crossover spectral lines

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