Population Loss in Closed Optical Transitions οf Rb and Cs Atoms Confined in Micrometric Thin Cells
V. Biancalanaa, S. Cartalevab, Y. Danchevaa, P.N. Goshc, E. Mariottia, S. Mitrad, L. Moia, N. Petrovb, B. Rayd, D. Sarkisyane and D. Slavovb
a CNISM - Unità di Siena, Dipartimento di Fisica and CSC Università di Siena, via Roma 56, 53100 Siena, Italy
b Institute of Electronics, BAS, boul. Tzarigradsko shosse 72, 1784 Sofia, Bulgaria
c Jadavpur University, Kolkata 700032, India
d Department of Physics, University of Calcutta, 92 APC Road, Calcutta 700009, India
e Institute for Physical Research, NAS of Armenia, Ashtarak-2, 378410, Armenia
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We present the first experimental observation of narrow dips in the fluorescence profiles of completely closed hyperfine transitions in Rb vapor at high atomic density, which is attributed to the depolarization of the excited state. Moreover, at low atomic density, a narrow peak on the top of the fluorescence profile is demonstrated, centered at the completely closed transition within the D2 line of Cs. Experiments are performed in thin (700 μm) alkali cell by single light beam spectroscopy. The cell is filled with Cs containing a small portion of Rb.
DOI: 10.12693/APhysPolA.116.495
PACS numbers: 32.30.-r, 32.70.Jz