Optical transition scheme in a two-level system: the straight arrow corresponds to excitation of an electron by absorption of a photon, the wavy arrow, to relaxation of the electron with stimulated emission of a photon.
Optical transitions for d-electrons acted on by circularly polarized pump light subject to the selection rules (4.1) (straight arrows) from a state with frozen orbital momentum described by the wave function (4.2). The wavy arrows with transition probabilities next to them correspond to spontaneous emission.
The ordering parameter ⟨l⟩ as a function of the ratio .
as a function of time (Eq. (7.21)) in the field of the nonequilibrium orbital momentum created by optical pumping (with ).
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