Particularities of optical pumping effects in cold and ultra-slow beams of Na and Cs in the case of cyclic transitions

Bruvelis, M.; Cinins, A.; Leitis, Aleksandrs; Efimov, Dmitry K.; Безуглов, Н. Н.; Chirtsov, A. S.; Fuso, Francesco; Экерс, А.

doi:10.1134/s0030400x1512005x

Cited by 3 publications

(3 citation statements)

References 10 publications

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“…Adiabatic elimination for Bloch equations (11) was implemented in [27]. At the first stage, using Equation (14), we express non-diagonal elements ρ ij (i = j) via diagonal ones, i.e., via populations n i .…”

Section: Strict Resultsmentioning

confidence: 99%

Nonlinear Spectroscopy of Alkali Atoms in Cold Medium of Astrophysical Relevance

Efimov

Bruvelis

Безуглов

et al. 2017

Atoms

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Abstract:The time-dependent population dynamics of hyperfine (HF) sublevels of n 2 p 3/2 atomic states upon laser excitation in a cold medium of alkali atoms is examined. We demonstrate some peculiarities of the absorption HF multiplet formation in D2-line resulting from a long interaction time (∼200 µs) interaction between light and Na (n = 3) and Cs (n = 6) atoms in a cold and slow sub-thermal (T ∼ 1K) beam. We analytically describe a number of D2-line-shape effects that are of interest in spectroscopic studies of cold dusty white dwarfs: broadening by optical pumping, intensity redistribution within components of D2-line HF multiplet for partially closed transitions and asymmetry of absorption lines induced by AC Stark shifts for cyclic transitions.

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Section: Strict Resultsmentioning

confidence: 99%

Nonlinear Spectroscopy of Alkali Atoms in Cold Medium of Astrophysical Relevance

Efimov

Bruvelis

Безуглов

et al. 2017

Atoms

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“…However, instead of analyzing fluorescence signals sometimes it can be more preferable to study the photocurrent signals caused by the processes of excited states photoionization. The possibility of close to 100percent efficiency of photoelectrons recording ensures stronger response signals generated under photoionization of polarized atoms [3], thus it opens up an opportunity of observing very fine physical effects caused by alignment or/and orienting [3,4] of gaseous media due to, for example, optical pumping [5]. In this study the " pump-probe" method is used to investigate the 5p 5 ( 2 P 3/2 )6p[3/2] 2 (79212.5 cm −1 ) state of Xe isotopes in a supersonic beam.…”

Section: Introductionmentioning

confidence: 99%

Modulation of quantum beats signal upon photoionization of Xe isotopes in the magnetic field

E.A.

P.YU.

N.N.

et al. 2022

Optics and Spectroscopy

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Photoionization processes involving polarized Xe atoms in the presence of an external magnetic field were analyzed in our previous studies. It was shown that the modulation of quantum beats in the observed electronic photo signals could not be explained by the Paschen-Back effect accounting for fine-structure levels only. In the current work, ionized Xe+ isotopes are used as the output channel of photoionization. By comparing the temporal partial signals in the mass spectra of the Xe+ isotopes, it was possible to explain the modulation of quantum beats in ion fluxes as a consequence of the presence of the hyperfine structure in the Zeeman components of the 129Xe and 131Xe isotopes. Keywords: quantum beats, hyperfine structure, Zeeman effect, two-photon excitation, femtosecond ionization, "pump-probe"-experiment.

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“…This population can be found via asymptotic solution of the Schrödinger equation (2) upon adiabatic switching (3) of the P -field Rabi frequency. At t = 0 the entire population is in state g. The chosen amplitude 0 = 0.1 MHz is too small to cause any notable depletion of state g due to optical pumping [23][24][25]. The relaxation rates α = 1/τ α for the upper and intermediate levels are calculated using the values τ f = 52.4 ns and τ i = 16.3 ns that correspond to the radiative lifetimes of the 4d 5/2 and 3p 3/2 states of Na, respectively [26,27].…”

Section: B Peaks Associated With the Chameleon Statesmentioning

confidence: 99%

Hyperfine interaction in the Autler-Townes effect: The formation of bright, dark, and chameleon states

et al. 2017

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This paper is devoted to clarifying the implications of hyperfine (HF) interaction in the formation of adiabatic (i.e., "laser-dressed") states and their expression in the Autler-Townes (AT) spectra. We first use the Morris-Shore model [J. R. Morris and B. W. Shore, Phys. Rev. A 27, 906 (1983)] to illustrate how bright and dark states are formed in a simple reference system where closely spaced energy levels are coupled to a single state with a strong laser field with the respective Rabi frequency S . We then expand the simulations to realistic hyperfine level systems in Na atoms for a more general case when non-negligible HF interaction can be treated as a perturbation in the total system Hamiltonian. A numerical analysis of the adiabatic states that are formed by coupling of the 3p 3/2 and 4d 5/2 states by the strong laser field and probed by a weak laser field on the 3s 1/2 − 3p 3/2 transition yielded two important conclusions. Firstly, the perturbation introduced by the HF interaction leads to the observation of what we term "chameleon" states-states that change their appearance in the AT spectrum, behaving as bright states at small to moderate S , and fading from the spectrum similarly to dark states when S is much larger than the HF splitting of the 3p 3/2 state. Secondly, excitation by the probe field from two different HF levels of the ground state allows one to address orthogonal sets of adiabatic states; this enables, with appropriate choice of S and the involved quantum states, a selective excitation of otherwise unresolved hyperfine levels in excited electronic states.

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Particularities of optical pumping effects in cold and ultra-slow beams of Na and Cs in the case of cyclic transitions

Cited by 3 publications

References 10 publications

Nonlinear Spectroscopy of Alkali Atoms in Cold Medium of Astrophysical Relevance

Nonlinear Spectroscopy of Alkali Atoms in Cold Medium of Astrophysical Relevance

Modulation of quantum beats signal upon photoionization of Xe isotopes in the magnetic field

Hyperfine interaction in the Autler-Townes effect: The formation of bright, dark, and chameleon states

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