Spectroscopy and physics of atoms and molecules

Polarization dependence of cesium vapor absorption on the D1 line in low magnetic fields: isotropy of transition $F=3\to F'=4$

G. G. Kozlov

Spin optics laboratory, Saint-Petersburg State University

Abstract: The paper studies the polarization dependence of cesium vapor absorption in the spectral region of the D1 line in weak magnetic fields, when the Zeeman structure of the spectrum is not resolved. The developed theory shows that the experimentally observed dependence of absorption on the relative orientation of the azimuth of the probe beam polarization and the magnetic field is a nonlinear effect and can be interpreted using the expansion of the energy absorbed by the atom over the time $T$ of its flight through the beam to terms $\sim T^2$. Within the framework of the proposed theory, it was also possible to explain the absence of an orientation dependence of absorption at the transition $F=3\to F'=4$ (isotropic transition) and to quantitatively describe this dependence at other transitions of the D1 cesium line.

Keywords: alkali metal vapor spectroscopy, D1 cesium line, nonlinear absorption, unresolved Zeeman splitting.

Received: 18.02.2025
Revised: 22.04.2025
Accepted: 10.06.2025

DOI: 10.61011/OS.2025.06.60910.7622-25

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