An investigation is reported of coherent resonance 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 by means of a Hanle effect configuration. In a coherent population trapping experiment, a very narrow (~1-kHz) resonance superimposed upon a broader resonance (~100 kHz) was observed. The dependence of the width and the amplitude of the coherent resonance on the laser power density, on additional constant magnetic fields, on the laser frequency position along the fluorescence profile, and on Rb cells with different dimensions was investigated.
© 2003 Optical Society of America
(020.1670) Atomic and molecular physics : Coherent optical effects
(020.7490) Atomic and molecular physics : Zeeman effect
(030.1670) Coherence and statistical optics : Coherent optical effects
Emilia Alipieva, Sanka Gateva, Elena Taskova, and Stefka Cartaleva, "Narrow structure in the coherent population trapping resonance in rubidium," Opt. Lett. 28, 1817-1819 (2003)