Coherent population trapping and strong electromagnetically induced transparency resonances on the D-1 line of potassium

Year: 2009

Authors: Gozzini S., Cartaleva S., Lucchesini A., Marinelli C., Marmugi L. Slavov D., Karaulanov T.

Autors Affiliation: CNR – Istituto per i Processi Chimico-Fisici, Area Ric., Pisa, Italy; Institute of Electronics, BAS, Sofia, Bulgaria; CNISM Dipartimento di Fisica dell’Universita\’ di Siena; Department of Physics, University of California at Berkeley, Berkeley, CA, USA

Abstract: In this paper we report the first experimental observation of coherent population trapping (CPT) in thermal potassium vapor in a three levels I > 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.

Journal/Review: EUROPEAN PHYSICAL JOURNAL D

Volume: 53 (2)      Pages from: 153  to: 161

More Information: The authors wish to thank Mr. Badalassi and Mr. Tagliaferri for the technical assistance. Special thanks go to Prof. G. Alzetta for his precious and continuous suggestions. The work was done under collaboration program between the Italian National Research Council and the Bulgarian Academy of Sciences. We also acknowledge the partial support under the INTAS project (grant: 06-1000017-9001) and Indian-Bulgarian collaboration (No: BIn-2/07).
DOI: 10.1140/epjd/e2009-00126-5

Citations: 21
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