Coherent Population Trapping resonances on lower atomic levels of\n Doppler broadened optical lines

2012/12/16 by Ersoy Şahin, Sahin, Ersoy, G. Özen +8
Physics and Astronomy · #Atomic and Subatomic Physics Research #Quantum optics and atomic interactions #Cold Atom Physics and Bose-Einstein Condensates

paper · pdf · doi:10.48550/arxiv.1212.3834

Abstract

We have detected and analysed narrow high-contrast coherent population\ntrapping (CPT) resonances, which are induced in absorption of the weak probe\nlight beam by the counterpropagating two-frequency pumping radiation. Our\nexperimental investigations have been carried out on example of nonclosed three\nlevel Lambda systems formed by spectral components of the Doppler broadened D2\nline of cesium atoms. We have established that CPT resonances in transmission\nof the probe beam (in the cesium vapor), at definite conditions, may have not\nonly more contrast but also much lesser width in comparison with well- known\nCPT resonances in transmission of the corresponding two-frequency pumping\nradiation. Thus CPT resonances, detected by the elaborated method, may be used\nin atomic frequency standards and sensitive magnetometers (based on the CPT\nphenomenon) and also in ultahigh resolution spectroscopy of atoms and\nmolecules.\n

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• Doppler-free spectroscopy of the Cs 6S_1/2-7P_3/2 atomic transition at 456 nm in a nanometric-thick vapor layer
• Doppler-free spectroscopy on Cs D₁ line with a dual-frequency laser
• Decrease of transit-time broadening of spectral resonances by optical pumping of atoms
• An effective model for describing coherent population trapping resonances, which correctly takes into account the off-resonant frequency components in periodically modulated laser field