Atomic Physics

The European Physical Journal D

, Volume 53, Issue 2, pp 153-161

First online:

Coherent population trapping and strong electromagnetically induced transparency resonances on the D1 line of potassium

  • S. GozziniAffiliated withIstituto per i Processi Chimico-Fisici del Consiglio Nazionale delle Ricerche — Area della Ricerca, via G. Moruzzi 1 Email author 
  • , S. CartalevaAffiliated withInstitute of Electronics
  • , A. LucchesiniAffiliated withIstituto per i Processi Chimico-Fisici del Consiglio Nazionale delle Ricerche — Area della Ricerca, via G. Moruzzi 1
  • , C. MarinelliAffiliated withCNISM Dipartimento di Fisica dell’Università di Siena
  • , L. MarmugiAffiliated withIstituto per i Processi Chimico-Fisici del Consiglio Nazionale delle Ricerche — Area della Ricerca, via G. Moruzzi 1
  • , D. SlavovAffiliated withInstitute of Electronics
  • , T. KaraulanovAffiliated withInstitute of ElectronicsDepartment of Physics, University of California at Berkeley

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Abstract

In this paper we report the first experimental observation of coherent population trapping (CPT) in thermal potassium vapor in a three levels Λ scheme. We demonstrate that K presents the advantage of a reduced modulation frequency with a large resonance contrast (up to 40%), in comparison to similar approaches with other alkalis. We report also the first evidence of electromagnetically induced transparency (EIT) resonances in K in the so called Hanle configuration. We tested different kinds of cells, demonstrating strong enhancement of the resonance contrast and amplitude for antirelaxation coated and buffered cells containing K vapor: resonance contrast up to 90% (for coated cells) and 65% (for buffered cells) is achieved with a linewidth of about 13 mG, while under similar conditions, the EIT resonance contrast in Cs vapor buffered by Ar gas is about 1%. Such relevant improvement is due to the reduced optical pumping in K, because of the overlapping of the hyperfine levels Doppler profiles, which does not occur in the case of Rb and Cs vapor. For this reason, K can be considered very promising for further CPT and EIT applications, especially for those where optical pumping losses represent a major limiting factor, such as light slowing and magnetometry.

PACS

32.80.Qk Coherent control of atomic interactions with photons 82.53.Kp Coherent spectroscopy of atoms and molecules 32.30.Dx Magnetic resonance spectra