Comparison of 87Rb N-resonances for D1 and D2 transitions
Irina Novikova, David F. Phillips, Alexander S. Zibrov, Ronald L. Walsworth, Alexksei V. Taichenachev, Valeriy I. Yudin
Abstract
We report an experimental comparison of three-photon-absorption resonances (known as "N-resonances") for the D1 and D2 optical transitions of thermal 87Rb vapor. We find that the D2 N-resonance has better contrast, a broader linewidth, and a more symmetric lineshape than the D1 N-resonance. Taken together, these factors imply superior performance for frequency standards operating on alkali D2 N-resonances, in contrast to coherent population trapping (CPT) resonances for which the D2 transition provides poorer frequency standard performance than the D1 transition.
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