Laser spectroscopy of sub-micrometre- and micrometre-thick caesium-vapour layers

Cartaleva, S.; Krasteva, A.; Moi, L.; Sargsyan, A.; Sarkisyan, D.; Slavov, D.; Todorov, Petko; Vaseva, K.

doi:10.1070/qe2013v043n09abeh014772

Cited by 11 publications

(8 citation statements)

References 19 publications

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“…With a small pump frequency detuning from the resonance (figure 5), the EIT resonance is slightly broadened and its contrast does not change significantly. As the EIT resonance is shifted from the F g = 4 → F e = 4 transition centre by Δ = 43 MHz, which is larger than the width of the VSOP resonances observed in the MM cell by single beam spectrosocopy [20], it is accompanied by the VSOP (4-4) resonance. The last resonance is observed as a dip in absorption (fluorescence) that is centered at the F g = 4 → F e = 4 transition.…”

Section: Methodsmentioning

confidence: 69%

“…The last resonance is observed as a dip in absorption (fluorescence) that is centered at the F g = 4 → F e = 4 transition. Under the conditions of low light intensity and atomic source temperature, at the F g = 4 → F e = 5 transition centre a sharp peak in absorption is observed [20], which is denoted as VSOP 4-5 in figure 5.…”

Section: Methodsmentioning

confidence: 99%

“…The pump laser is switched off. It can be seen (figure 6, curve 3) that by single beam spectroscopy in the MM cell two different VSOP resonances can be observed (for more details see [20]): (i) narrow dip in the absorption at the F g = 4 → F e = 4 transition centre (VSOP 4-4) and (ii) peak in the absorption at the F g = 4 → F e = 5 transition centre (VSOP 4-5). These two narrow features are used as a frequency reference when determining the EIT and VSOPE resonance frequency positions.…”

Section: Methodsmentioning

confidence: 99%

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Observation and theoretical simulation of electromagnetically induced transparency and enhanced velocity selective optical pumping in cesium vapour in a micrometric thickness optical cell

Krasteva¹,

Ray²,

Slavov³

et al. 2014

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

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Observation of electromagnetically induced transparency (EIT) and enhanced velocity selective optical pumping (VSOP) signals in a micrometric cell with cesium is reported. The line shape and non-linear features observed in the case of fluorescence in the direction parallel to the cell windows and the transmission spectra observed along the propagation direction of the probe beam show considerable differences in the spectral profile. A theoretical model based on five level optical Bloch equations is used to simulate the spectra. The Doppler convolution includes all possible orientations of atomic velocities with respect to the laser beam direction. Atoms moving nearly parallel to the windows and perpendicular to the collinear pump and probe beams have much lower Doppler shift and hence produce considerable narrowing of the Doppler background in the fluorescence spectra. The coherence decay rate is also low for such atoms as they do not meet with the cell walls. The simulated curves reproduce the observed sharp EIT peaks and enhanced broad VSOP signals for the closed probe transition in the fluorescence and absorption spectra. The observed effect of detuning of the pump frequency on the non-linear features is also reproduced by the simulation.

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Section: Methodsmentioning

confidence: 69%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Observation and theoretical simulation of electromagnetically induced transparency and enhanced velocity selective optical pumping in cesium vapour in a micrometric thickness optical cell

Krasteva¹,

Ray²,

Slavov³

et al. 2014

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

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“…An optical cell with internal longitudinal and transversal dimensions 8 mm contains atomic Cs vapor buffered by 20 Torr of Ne. Part of the probe radiation is directed to another cell with L=6λ thickness, which is used to provide a reference spectrum for calibration of the probe laser detuning (for more details see [15]). The probe and the coupling laser beams are separated using a polarizing BS PBS situated after the 8 mm optical cell.…”

Section: Methodsmentioning

confidence: 99%

Observation and theoretical simulation of N-resonances in Cs D₂ lines

Krasteva¹,

Gosh²,

Gateva³

et al. 2019

Phys. Scr.

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N-type resonances in Cs D2 lines are investigated in optical cell for different detuning of the fixed coupling transition frequency. Using two independent DFB lasers makes it possible to observe high contrast and subnatural-width N-resonances without magnetic field shielding of an optical buffer gas cell with sub-centimeter dimensions. According to the detuning of the coupling laser frequency, an N-resonance with frequency higher or lower than this of the coupling transition frequency is registered. In the first case the N-resonance is in absorption, but in the second case, an inverse N-resonance (enhanced transparency) is measured. A theoretical simulation of the line shape, which is based on solution of optical Bloch equations and considers the interaction of both coupling and probe radiations with the atomic system is done. The simulation leads to N-resonance peaks in agreement with the observed peaks for different positions of the coupling frequency. The presented approach is of importance for further study and optimization of the three-photon and magneto-optical resonances, as well as for miniaturization of optical sensors based on spatially restricted hot alkali vapor.

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“…Some of these early studies also applied the optical Bloch equations to a simplified two-level representation with optical pumping losses [15,18], but only in the linear excitation regime for intensities up to several milliwatts per square centimeter and Rabi frequencies less than 10 MHz. More recently, the cesium D 2 line has been studied experimentally and theoretically at somewhat higher powers up to 40 mW/cm 2 using a model based on the optical Bloch equations [19,20], but these models still were based on an open two-level system rather than including all degenerate sublevels. Furthermore, theoretical results were not compared directly to experimental curves, with the exception of some aggregate parameters, such as peak amplitude.…”

Section: Introductionmentioning

confidence: 99%

Relaxation mechanisms affecting magneto-optical resonances in an extremely thin cell: Experiment and theory for the cesiumD1line

et al. 2015

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We have measured magneto-optical signals obtained by exciting the D1 line of cesium atoms confined to an extremely thin cell (ETC), whose walls are separated by less than one micrometer, and developed an improved theoretical model to describe these signals with experimental precision. The theoretical model was based on the optical Bloch equations and included all neighboring hyperfine transitions, the mixing of the magnetic sublevels in an external magnetic field, and the Doppler effect, as in previous studies. However, in order to model the extreme conditions in the ETC more realistically, the model was extended to include a unified treatment of transit relaxation and wall collisions with relaxation rates that were obtained directly from the thermal velocities of the atoms and the length scales involved. Furthermore, the interaction of the atoms with different regions of the laser beam were modeled separately to account for the varying laser beam intensity over the beam profile as well as saturation effects that become important near the center of the beam at the relatively high laser intensities used during the experiments in order to obtain measurable signals. The model described the experimentally measured signals for laser intensities for magnetic fields up to 55 G and laser intensities up to 1 W/cm 2 with excellent agreement.

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Laser spectroscopy of sub-micrometre- and micrometre-thick caesium-vapour layers

Cited by 11 publications

References 19 publications

Observation and theoretical simulation of electromagnetically induced transparency and enhanced velocity selective optical pumping in cesium vapour in a micrometric thickness optical cell

Observation and theoretical simulation of electromagnetically induced transparency and enhanced velocity selective optical pumping in cesium vapour in a micrometric thickness optical cell

Observation and theoretical simulation of N-resonances in Cs D₂ lines

Relaxation mechanisms affecting magneto-optical resonances in an extremely thin cell: Experiment and theory for the cesiumD1line

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Laser spectroscopy of sub-micrometre- and micrometre-thick caesium-vapour layers

Cited by 11 publications

References 19 publications

Observation and theoretical simulation of electromagnetically induced transparency and enhanced velocity selective optical pumping in cesium vapour in a micrometric thickness optical cell

Observation and theoretical simulation of electromagnetically induced transparency and enhanced velocity selective optical pumping in cesium vapour in a micrometric thickness optical cell

Observation and theoretical simulation of N-resonances in Cs D2 lines

Relaxation mechanisms affecting magneto-optical resonances in an extremely thin cell: Experiment and theory for the cesiumD1line

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Observation and theoretical simulation of N-resonances in Cs D₂ lines