Abstract

We have compared coherent population trapping (CPT) resonances, both experimentally and theoretically, for excitation of the $D_1$ and $D_2$ transitions of thermal ${}^{85}\mathrm{Rb}$ vapor. Excitation of the $D_1$ line results in greater resonance contrast than excitation of the $D_2$ line and in a reduction in the resonance width, in agreement with theoretical expectations. These results translate into a nearly tenfold improvement in performance for the application of CPT resonances to a frequency standard or a sensitive magnetometer when the $D_1$ line, rather than the $D_2$ line, is used.

© 2002 Optical Society of America

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