High Contrast Resonances of the Coherent Population Trapping
on Sublevels of the Ground Atomic Term¹

E. Sahin^{a, b}, R. Hamid^a, C. Birlikseven^a, G. Özen^b, and A. Ch. Izmailov^c, *

^a National Metrology Institute of Turkey, Gebze, Kocaeli, Turkey

^b Istanbul Technical University, Faculty of Science and Letters,
Engineering Physics Department Maslak, Istanbul, Turkey

^c Institute of Physics, Azerbaijan National Academy of Sciences,
H. Javid av. 33, Baku, Az-1143, Azerbaijan

*e-mail: azizm57@rambler.ru

Received January 30, 2012; published online May 11, 2012

Abstract—We have detected and analyzed narrow, high contrast coherent population trapping resonances,
which appear in transmission of the probe monochromatic light beam under action of the counterpropagating
two-frequency laser radiation, on example of the nonclosed three level -system formed by spectral compo-
nents of the Doppler broadened D₂ line of cesium atoms (in the cell with the rarefied Cs vapor). These nontrivial
resonances are determined directly by the trapped atomic population on the definite lower level of the -system
and may be used in atomic frequency standards, sensitive magnetometers and in ultrahigh resolution laser spec-
troscopy of atoms and molecules.

DOI: 10.1134/S1054660X12060096

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