Abstract
The results of frequency-modulation (FM) spec- troscopy of coherent dark resonances from the Zeeman sub- levels of the transition F = 2 ↔ F = 1o fD1 line in absorp- tion 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. Varia- tion of the modulation frequency plays then a similar role as the variation of the relative frequency in conventional spec- troscopy. Experimental data are fit to the theoretical calcu- lations, which are based on the theory of FM spectroscopy of coherent dark resonances recently developed by us. Fea- sibility of using such experimental technique for accurate measurements of magnetic fields is also discussed.
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