Two-photon resonance on the D2 line of Cs enhanced by optical pumping

23rd International Laser Physics Workshop

Krasteva, A.^1 ; Slavov, D.^1 ; Sargsyan, A.^2 ; Sarkisyan, D.^2 ; Wilson-Gordon, A.D.^3 ; Cartaleva, S.^1

Institute of Electronics, BAS, 72 Tzarigradsko Shosse bld, Sofia

1784, Bulgaria^1

Institute for Physical Research, Academy of Sciences of Armenia, Ashtarak-2, Armenia

0203, Armenia^2

Department of Chemistry, Bar-Ilan University, Ramat Gan

5290002, Israel^3

关键词: Atomic population;    Atomic vapor;    Coupling beam;    Flat backgrounds;    Ground state levels;    Hyperfine transition;    Probe excitations;    Two-photon resonance;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/594/1/012009/pdf
DOI  :  10.1088/1742-6596/594/1/012009

来源: IOP

【 摘 要 】

Sub-natural-width N-type resonance, observed in the D2line of Cs vapor has been reported recently. Three-photon, bi-chromatic excitation of Cs atomic vapor with 20 Torr of Neon was performed and a sub-natural-width resonance was observed, superimposed on the absorption profile of a set of hyperfine transitions starting from single hyperfine ground level. Here we report the study of a different three-photon, couple-probe- excitation scheme that allows the observation of a sub-natural-width resonance situated on a flat background, well outside the D2line absorption spectrum of Cs. The lack of a noisy background could be advantageous for many applications related to the narrow N resonance. In addition, a new broader feature of enhanced transparency is demonstrated that is centered at the ground state level that does not interacting with the coupling beam. This enhanced transparency resonance can be attributed to the atomic population loss in a narrow spectral interval occurring due to excitation of energy levels situated above the 62P levels.