Solution of the optical-pumping equation

И. С. Кожокару, E. T. Davletov, Alexey V. Akimov

The numerical solution to optical Bloch equations for the transition F g = 4 ⇒ F e = 5 with a wavelength of 410.6 nmin the thulium atom is presented. The absorption spectrum saturation and narrowing effects due to optical pumping are considered in detail.

J. Brossel

S. Lang, S. I. Kanorsky, T. Eichler +3 more

We have studied both theoretically and experimentally the optical pumping of Cs atoms trapped in (body-centered-cubic and hexagonal-close-packed) crystalline ${}^{4}\mathrm{He}$ matrices. The theoretical approach is based on rate equations for which time-dependent and asymptotic solutions are obtained in the case of depopulation and repopulation pumping. Comparison with experiments show that repopulation pumping, i.e., a process in which spin polarization in the excited state is not destroyed, is the dominant pumping mechanism in both crystalline phases.

Robert A. Bernheim, Ernst K. Franke

Takashi Nakajima

We carry out the recursion-relation analysis for the optical pumping scheme to polarize nuclei by a sequence of short laser pulses and show that such analysis agrees very well with the numerical solution of density matrix equations. A small difference between the results obtained by the numerical solution of density matrix equations and recursion-relation analysis arises from the contribution of the very small populations remaining in excited states when the next pulse arrives, and the difference becomes smaller if the pulse interval is chosen to be much longer than the spontaneous lifetime of the excited states.

George William Series