Frequency-modulation spectroscopy of coherent dark resonances in ~(87)Rb atoms

摘要

The results of frequency-modulation (FM) spectroscopy of coherent dark resonances from the Zeeman sub-levels of the transition F = 2 reversible F=1 of D_1 line in absorption of ~(87)Rb atoms are presented and discussed in detail. By contrast with the conventional spectroscopy of coherent dark resonances employing two laser beams, relative frequency of which can be varied, these data has been obtained with the help of a single frequency-modulated laser field. Variation of the modulation frequency plays then a similar role as the variation of the relative frequency in conventional spectroscopy. Experimental data are fit to the theoretical calculations, which are based on the theory of FM spectroscopy of coherent dark resonances recently developed by us. Feasibility of using such experimental technique for accurate measurements of magnetic fields is also discussed.