Coherent population trapping resonances at lower atomic levels of Doppler broadened optical lines


Sahin E. , OZEN G., HAMID R., CELIK M., IZMAILOV A. C.

QUANTUM ELECTRONICS, cilt.44, sa.11, ss.1071-1076, 2014 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 44 Konu: 11
  • Basım Tarihi: 2014
  • Doi Numarası: 10.1070/qe2014v044n11abeh015240
  • Dergi Adı: QUANTUM ELECTRONICS
  • Sayfa Sayıları: ss.1071-1076

Özet

We have detected and analysed narrow high-contrast coherent population trapping (CPT) resonances, which are induced in absorption of a weak monochromatic probe light beam by counterpropagating two-frequency pump radiation in a cell with rarefied caesium vapour. The experimental investigations have been performed by the example of nonclosed three level L-systems formed by spectral components of the D-2 line of caesium atoms. The applied method allows one to analyse features of the CPT phenomenon directly at a given low long-lived level of the selected L-system even in sufficiently complicated spectra of atomic gases with large Doppler broadening. We have established that CPT resonances in transmission of the probe beam exhibit not only a higher contrast but also a much lesser width in comparison with well-known CPT resonances in transmission of the corresponding two-frequency pump radiation. The results obtained can be used in selective photo-physics, photochemistry and ultra-high resolution atomic (molecular) spectroscopy.