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The European Physical Journal D

A fully quantum investigation of the rubidium $$D_1$$ and $$D_2$$ far-wing line shapes provoked by argon atoms

Hadjer Benmebarek, N. Lamoudi, Mohamed Tahar Bouazza, Jamila Dhiflaoui, Hamid Berriche

Published Nov 1, 2025• 0 citations
Publisher
DOI
10.1140/epjd/s10053-025-01098-4

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A fully quantum investigation of the rubidium D1D_1D1​ and D2D_2D2​ far-wing line shapes provoked by argon atoms
In this work we report the CE from the dense rubidium vapor excited by the output from the mode-locked, 100 fs laser oscillator. The cone emission was observed only when the laser beam propagated through the high-density vapor (N>5x1016 cm− 3) and for the smaller densities no CE was observed. The laser central wavelength was changed in the wide interval, from the far blue wing of the D2 line to the far red wing of the D1 line. The observed CE in the far blue wing of the D2 line is interpreted as a consequence of the self-focusing and self-phase modulation according to the adiabatic following limit. The emission in the red wing of the D2 line shows defocusing of the propagating beam. In contrast to the CE reported so far, the bright central spot was not observed in the far blue wing. In the near blue wing the central spot appears due to the two- photon resonance at 778 nm. The temporal shape of the CE, measured by cross-correlation in the SHG crystal shows pulse breaking and extreme lengthening.