Coherent population trapping resonances in potassium with amplitude-modulated light

Silvia Gozzini; Luca Marmugi; Dimitar Slavov; Alessandro Lucchesini; Stefka Cartaleva

doi:10.1117/12.885314

17 January 2011 Coherent population trapping resonances in potassium with amplitude-modulated light

Silvia Gozzini, Luca Marmugi, Dimitar Slavov, Alessandro Lucchesini, Stefka Cartaleva

Proceedings Volume 7747, 16th International School on Quantum Electronics: Laser Physics and Applications; 77470O (2011) https://doi.org/10.1117/12.885314
Event: XVI International School on Quantum Electronics: Laser Physics and Applications, 2010, Nessebar, Bulgaria

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.

Citation Download Citation

Silvia Gozzini, Luca Marmugi, Dimitar Slavov, Alessandro Lucchesini, and Stefka Cartaleva "Coherent population trapping resonances in potassium with amplitude-modulated light", Proc. SPIE 7747, 16th International School on Quantum Electronics: Laser Physics and Applications, 77470O (17 January 2011); https://doi.org/10.1117/12.885314

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