MAGNETIC AND OPTICAL RESONANCE OF 2-LEVEL QUANTUM-SYSTEMS IN MODULATED FIELDS .2. FLOQUET HAMILTONIAN APPROACH

It is shown that, in modulated magnetic resonance on spin-1/2 systems, the time-averaged absorption signal of the optical pump beam can be obtained directly from the dressed-atom energy eigenvalues of the Floquet Hamiltonian for arbitrary orientations of the optical pump beam, namely, by a straightforward generalization of Shirley's well-known result [Phys. Rev. 138, B979 (1965)]. Analytical and numerical results derived from this generalized diagonalization technique are compared with the vanishing damping solution of the Bloch equations from the preceding paper [W. M. Ruyten, Phys. Rev. A 42, 4226 (1990)] and are shown to be in complete agreement with the latter. © 1990 The American Physical Society.