Abstract
Coherent population trapping (CPT) resonances in the degenerate two-level system of the F<sub>g</sub> = 2 → F<sub>e</sub> = 1) transition of the <sup>87</sup>Rb D<sub>1</sub> line were investigated in an uncoated vacuum cell by means of Hanle effect configuration. CPT signals with complex shape (narrow resonance approximately 2 mG superimposed on the wide one approximately 150 mG) were observed. The influence of weak transverse magnetic fields (0-1.2 G) on the amplitude and width of the two components was measured. The observed narrow resonances are interesting for application in high resolution spectroscopy and magnetometry.
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