Dynamics of atoms trapped in an optical dipole trap formed by a train of femtosecond laser pulses is studied
in detail on example of Rb atoms. In computer simulation, it is proved that such a trap effectively confines the
atoms at the pumping laser beam power in between 1 mW and 3 kW (pulse duration 100 fs). It is also shown
that the resonant dipole-dipole interaction (RDDI) through which closely spaced in the micropotential wells
atoms interact between each other becomes essential and can be significantly increased by shining the atoms
with resonant probe laser beam. Varying both the parameters of the trap and intensity of the probe laser field,
role of the RDDI in the atomic dynamics in the trap is clarified in detail.
Theoretical study and computer modeling results of the spectra of coherent dark resonances resulted from
excitation of Zeeman sublevels of the Fg=2→Fe=1 transition of the D1 line in 87Rb atoms by a frequency-modulated
laser field are presented and discussed in detail. The influence of the nonlinear Zeeman effect on
the structure of the coherent dark resonances is observed. It is shown that calculated for different values of the
magnetic field spectra are in a good agreement with the experimental data.
ABSTRACT
The results of frequency-modulation (FM) spectroscopy of coherent dark resonances from the Zeeman sublevels
of the transition F=2 ↔ F=1 of D1 line in absorption of 87Rb atoms are presented and discussed in detail.
By contrast with the conventional spectroscopy of coherent dark resonances employing two laser beams, relative
frequency of which can be varied, these data has been obtained with the help of a single frequency-modulated
laser field. Variation of the modulation frequency plays then similar role with variation the relative frequency
in conventional spectroscopy. Experimental data are fit to the theoretical calculations, which are based on
the theory of FM spectroscopy of coherent dark resonances recently developed by us. Feasibility of using such
experimental technique for accurate measurements of magnetic fields is also discussed.
Theoretical model for the frequency-modulation spectroscopy of dark resonances is discussed in detail on example of a three-level quantum system in A-configuration driven by resonant laser field(s) with and without frequency modulation using two simulation techniques-the density matrix and quantum trajectories analysis.
A theoretical model of the coherent population trapping (CPT) in multilevel samarium atom and its comparison with experimental spectroscopic data are presented. Theoretical model describes a degenerated (Lambda) -system in Sm atom formed of the transitions 4f66s2(7F0) mutually implies 4f6(7F)6s6p(3Po)9Fo1 mutually implies 4f66s2(7F1) and includes also a fourth level 4f66s2(7F2), which complements the model making it an open system. An open character of the system reduces the contrast of the resonance curves in the CPT- spectra, but does not change the width of the CPT resonance. Numerical modeling of the CPT resonances in Sm atom was carried out for the case of applied longitudinal and transverse magnetic fields in 7- and 12-level models, as well.
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