It is shown with the use of the solution of the Boltzmann equation for laser pumping in a cell with antirelaxation coating that the velocity distribution of atomic polarization moments (PMs) is essentially dependent on the value of the magnetic field H. The z-velocity distribution of PMs in a low field, H approximately 10^−4 A/m, is a Maxwellian one with a small admixture of an almost monokinetic one. At larger field the same distribution remains for longitudinal alignment, but for transverse alignment the Maxwellian part of the distribution disappears (at H approximately 1 A/m). It appears that the radial velocity distribution is also dependent on the field H. A calculation accounting for wall Maxwellization in low field gives for the pumping power needed to saturate the magneto-optic rotation a value similar to the experimentally determined value. It is shown that the known semiphenomenological theory neglecting the Maxwellization gives an acceptable description of magneto-optic rotation only for high (approximately 1 A/m) magnetic field.
© 2005 Optical Society of America
(020.0020) Atomic and molecular physics : Atomic and molecular physics
(020.1670) Atomic and molecular physics : Coherent optical effects
(020.2070) Atomic and molecular physics : Effects of collisions
A. I. Okunevich, "Velocity distribution of laser-induced atomic polarization moments in antirelaxation-coated cell and magneto-optic rotation," J. Opt. Soc. Am. B 22, 29-36 (2005)