https://doi.org/10.1140/epjd/e2018-90146-3
Regular Article
The blue light in a ladder system: from double resonance optical pumping to Autler-Townes splitting
1
Department of Physics, University of Kashmir,
Hazratbal,
Srinagar
190006, India
2
Laser and Plasma Technology Division, Bhabha Atomic Research Centre,
Trombay,
Mumbai
400 085, India
3
Radioactive Ion Beam Group, Variable Energy Cyclotron Centre,
Kolkata
700064, India
a e-mail: ayanray75@gmail.com
Received:
30
March
2018
Received in final form:
10
May
2018
Published online: 3
July
2018
In this experimental work we report our findings about a Ladder (Ξ) transition 5S1∕2 → 5P3∕2 → 5D3∕2 of 85Rb atoms under different laser power combinations. Based on the ratio of power levels of two individual lasers, which are used in counter-propagating configuration, the system exhibits double resonance optical pumping and Autler-Townes splitting. The excursion of the Ξ level coupling is studied alongwith photon counting of blue light originating from 5D3∕2 → 6P3∕2 → 5S1∕2 non-degenerate decay. The blue photon statistics shows that emitted radiation are thermal. However the probability density of the integrated photon count vs. laser power exhibits a jump in intensity scale followed by a long tail, which resembles Lèvy type distribution. This may be considered as a signature when the level dressing changes in Ξ system as theoretically discussed earlier by Abi-Salloum [T.Y. Abi-Salloum, J. Mod. Opt. 57, 1366 (2010); T.Y. Abi-Salloum, Phys. Rev. A 81, 053836 (2010)].
Key words: Quantum Optics
© EDP Sciences / Società Italiana di Fisica / Springer-Verlag GmbH Germany, part of Springer Nature, 2018