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Proceedings Paper

Coherent population trapping resonances in potassium with amplitude-modulated light
Author(s): Silvia Gozzini; Luca Marmugi; Dimitar Slavov; Alessandro Lucchesini; Stefka Cartaleva
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Paper Abstract

We present the results of an experimental study of Coherent Population Trapping (CPT) in potassium, obtained by means of modulation of laser light amplitude with kHz frequency. The radiation from an external cavity diode laser, matching the D1 line of K, is modulated by an acousto-optical modulator. In the cell containing buffer gas, the CPT resonance width is reduced more than three orders of magnitude as compared to the cell containing pure potassium vapor. In K this resonance narrowing occurs with high resonance contrast; such behavior is not observed in buffered cells containing Rb or Cs, where the optical pumping to the non-interacting with the light ground level is very effective and depletes the population of the working ground Zeeman sublevels. The narrow CPT resonance of reduced fluorescence transforms to the one of enhanced fluorescence with the cell temperature rising. The transformed resonance exhibits higher contrast and lower width than those of the reduced fluorescence resonance. Hence, beside its scientific importance the resonance sign reversal can be used for the improvement of the CPT resonance parameters.

Paper Details

Date Published: 17 January 2011
PDF: 8 pages
Proc. SPIE 7747, 16th International School on Quantum Electronics: Laser Physics and Applications, 77470O (17 January 2011); doi: 10.1117/12.885314
Show Author Affiliations
Silvia Gozzini, INO-CNR, u.o.s. di Pisa (Italy)
Luca Marmugi, INO-CNR, u.o.s. di Pisa (Italy)
Dimitar Slavov, Institute of Electronics (Bulgaria)
Alessandro Lucchesini, INO-CNR, u.o.s. di Pisa (Italy)
Stefka Cartaleva, Institute of Electronics (Bulgaria)

Published in SPIE Proceedings Vol. 7747:
16th International School on Quantum Electronics: Laser Physics and Applications
Tanja Dreischuh; Dimitar Slavov, Editor(s)

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