Abstract

By using the two-photon absorption technique, we have theoretically and experimentally investigated fine and hyperfine Zeeman structures of the $3S_{1/2}-4D_{3/2,5/2}$ transition in a hot Na vapor in the presence of a magnetic field. Among 80 possible Zeeman lines, 10 lines were found to be forbidden, and the remaining 70 allowed lines were classified into four different manifolds: $3S_{1/2}$, $F=2$ to $4D_{5/2}$, $F=2$ to $4D_{3/2}$, $F=1$ to $4D_{5/2}$, and $F=1$ to $4D_{3/2}$. The Zeeman spectra of each manifold critically depended upon the polarization configurations of the forward and backward excitation laser beams. The peak position, the peak height, and the polarization dependence of each Zeeman component were fully analyzed and compared with the theoretical predictions, resulting in fair agreement between theory and experiment.

© 2016 Optical Society of America

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