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The European Physical Journal D

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

Silvia Gozzini, S. Cartaleva, A. Lucchesini, C. Marinelli, Luca Marmugi, Dimitar G. Slavov, Todor S. Karaulanov

Published Apr 17, 2009• 28 citations
Publisher
DOI
10.1140/epjd/e2009-00126-5

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Coherent Population Trapping (CPT) is observed on the first and second resonance lines of potassium, by irradiating the vapor by 770.1 nm and 404.5 nm diode laser light, respectively. With the 770.1 nm excitation, narrow CPT resonance is observed demonstrating 80 times larger contrast than in case of Cs vapor, in coated optical cell. A theoretical model is proposed to explain strong resonance contrast enhancement. Irradiating K vapor with the 404.5 nm laser, the CPT resonance is observed both on the 404.5 nm and 770.1 nm lines, which makes the study of various cascade transitions in potassium possible.
We report on an investigation of electromagnetically induced transparency (EIT) in sodium vapour. In our experiment, sodium atoms are excited on the D1-line with laser radiation containing two components with a frequency difference close to that of the two hyperfine ground states of sodium (1.772 GHz). Such an excitation leads to coherent trapping of atomic population in “dark” superpositional states, which dramatically reduces the absorption of light. A frequency transparency window is measured to have a subnatural width, which is a clear indication of coherent population trapping. Dependence of EIT on laser frequencies and intensities, on the magnetic field strength as well as on the temperature of the sodium vapour is studied.