High contrast resonances of the coherent population trapping on   sublevels of the ground atomic term
  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 {\Lambda}-system formed by spectral components 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 {\Lambda}-system and may be used in atomic frequency standards, sensitive magnetometers and in ultrahigh resolution laser spectroscopy of atoms and molecules. 
Ersoy Sahin, Ramiz Hamid, Cengiz Birlikseven, G\"on\"ul \"Ozen and   Azad Ch. Izmailov
physics.atom-ph quant-ph