Abstract
We report a new method for excitation of magnetic resonance in an optically aligned atomic ensemble. It employs a comb-like rf field acting on the end sublevels of the ${F_g} = 1$ state separated by the doubled Zeeman frequency. This approach provides a resonance without substructures associated with the quadratic Zeeman shift. A theoretical explanation of the effect is given in terms of the two-quantum transition $|{{F}_{g}} = 1, {{m}_{{{F}_{g}}}} = - {{1}}\rangle \leftrightarrows |{{F}_{g}} = 1, {{{m}}_{{{F}_{g}}}} = 1 \rangle$ and is corroborated by an experiment with $^{87}{\rm{Rb}}$ atoms. Possible advantages of the approach and its range of applicability are discussed.
© 2020 Optical Society of America
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