Dark Hanle resonances from selected segments of the Gaussian laser beam cross-section

Krmpot, Aleksandar J.; Ćuk, Senka; Nikolić, Stanko N.; Radonjić, M.; Slavov, D.; Jelenković, Branislav

doi:10.1364/oe.17.022491

Cited by 17 publications

(34 citation statements)

References 19 publications

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“…On the other hand, the change of atomic coherence in the magnetic field is found to play a significant role in the line shapes obtained in parts of the Gaussian laser beam cross section [16]. Results in Figs.…”

Section: Theoretical Modelmentioning

confidence: 83%

“…These results are reversed to the results obtained from different segments of a Gaussian laser beam cross section. In the latter case two minima appear, and the resonances are narrower, when the small aperture is placed at the wings of the Gaussian beam cross section [16].…”

Section: Theoretical Modelmentioning

confidence: 95%

“…Due to interaction with a laser electric field having different distributions in the Gaussian and -shaped beams, the atomic state develops differently in the presence of a small external magnetic field. Narrowing of the Hanle EIT in the wings of the Gaussian laser beam is observed and explained by the interference of the laser light and coherently prepared atoms coming from the central part of the beam [16]. Such Ramsey-type narrowing of dark-state resonances was studied also in different geometries in Refs.…”

Section: Introductionmentioning

confidence: 93%

“…We used a Hanle configuration with the laser locked to the F g = 2 → F e = 1 hyperfine transition of the D 1 line in the 87 Rb isotope in the vacuum vapor cell. Similar examinations of the EIT resonances in different segments, but for the Gaussian laser beam cross section, were performed in an effusive regime in the Rb vacuum cell [16] and in a diffusive regime in the dense 4 He + vapor [17]. Due to interaction with a laser electric field having different distributions in the Gaussian and -shaped beams, the atomic state develops differently in the presence of a small external magnetic field.…”

Section: Introductionmentioning

confidence: 95%

“…For the interaction of the Gaussian or laser beam with alkali-metal-atom vapor, the different effects such as Ramsey and Dicke narrowing, transit time, and Doppler broadening are examined either in vacuum [7,8] or in buffer gas cells [9][10][11][12] The differences in EIT line shapes for Gaussian and laser beams were presented in [13][14][15] by considering only the entire laser beam contribution without focusing on the details of laser-atom interaction within the laser beam. However, different parts of the laser beam cross section, after passing through the alkali-metal vapor cell, carry different information about the atomic state and yield different EIT resonances [16].…”

Section: Introductionmentioning

confidence: 99%

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Evolution of dark state of an open atomic system in constant intensity laser field

et al. 2011

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We studied experimentally and theoretically the evolution of open atomic systems in the constant intensity laser field. The study is performed by analyzing the line shapes of Hanle electromagnetically induced transparency (EIT) obtained in different segments of a laser beam cross section of constant intensity, i.e., a -shaped laser beam. Such Hanle EIT resonances were measured using a small movable aperture placed just in front of the photodetector, i.e., after the entire laser beam had passed through the vacuum Rb cell. The laser was locked to the open transition F g = 2 → F e = 1 at the D 1 line of 87 Rb with laser intensities between 0.5 and 4 mW/cm 2 . This study shows that the profile of the laser beam determines the processes governing the development of atomic states during the interaction. The resonances obtained near the beam center are narrower than those obtained near the beam edge, but the significant changes of the linewidths occur only near the beam edge, i.e., right after the atom enters the beam. The Hanle EIT resonances obtained near the beam center exhibit two pronounced minima next to the central maximum. The theoretical model reveals that the occurrence of these transmission minima is a joint effect of the preparation of atoms into the dark state and the optical pumping into the uncoupled ground level F g = 1. The appearance of the transmission minima, although similar to that observed in the wings of a Gaussian beam [A. J. Krmpot et al., Opt. Express 17, 22491 (2009)], is of an entirely different nature for the -shaped laser beam.

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Section: Theoretical Modelmentioning

confidence: 83%

Section: Theoretical Modelmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Evolution of dark state of an open atomic system in constant intensity laser field

et al. 2011

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Higher-order breathers as quasi-rogue waves on a periodic background

et al. 2022

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We investigate higher-order breathers of the cubic nonlinear Schrödinger equation on a periodic elliptic background. We find that, beyond first order, any arbitrarily constructed breather on a disordered background generates a single-peaked solitary wave. However, on the periodic backgrounds, the so-called quasi-rogue waves are found more common. These are the quasiperiodic breathers that feature distorted side peaks. We construct such higher-order breathers out of constituent first-order breathers with commensurate periods (i.e., as higher-order harmonic waves). In addition to quasiperiodic, we also find fully periodic breathers, when their wavenumbers are harmonic multiples of the background and each other. But they are truly rare, requiring finely tuned parameters. Thus, on a periodic background, we arrive at the paradoxical conclusion that the higher-order quasi-rogue waves are rather common, while the truly periodic breathers are exceedingly rare.

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Multi-elliptic rogue wave clusters of the nonlinear Schrödinger equation on different backgrounds

et al. 2022

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In this work we analyze the multi-elliptic rogue wave clusters as new solutions of the nonlinear Schrödinger equation (NLSE). Such structures are obtained on uniform backgrounds by using the Darboux transformation scheme of order n with the first m evolution shifts that are equal, nonzero, and eigenvaluedependent, while the imaginary parts of all eigenvalues tend to one. We show that an Akhmediev breather of n 2m order appears at the origin of the (x, t) plane and can be considered as the central rogue wave of the cluster. We show that the high-intensity narrow peak,

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Dark Hanle resonances from selected segments of the Gaussian laser beam cross-section

Cited by 17 publications

References 19 publications

Evolution of dark state of an open atomic system in constant intensity laser field

Evolution of dark state of an open atomic system in constant intensity laser field

Higher-order breathers as quasi-rogue waves on a periodic background

Multi-elliptic rogue wave clusters of the nonlinear Schrödinger equation on different backgrounds

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