ABSTRACT
A nonlinear Schrödinger equation for the dynamics of a resonantly driven two-level model including both T(1) and T(2) processes is presented. This equation is novel in that it can account both for the rate of population flow into an energy level and for the destruction of phase information, i.e., it can account for the system's evolution into a mixed quantum state.
ABSTRACT
We calculate the susceptibility responsible for self-focusing in SF(6) in two parts, the v(3)-ladder contribution and the quasi-continuum contribution. Our v(3)-ladder vibrational model is a classical triply degenerate anharmonic oscillator in the Cartesian basis with the anharmonicity parameters chosen to be consistent with the latest spectroscopic analysis of the 3v(3)-overtone spectrum. The rotational structure is represented by a distribution of these oscillators in which the distribution is chosen to correspond to the spectrum of the v(3) fundamental. Using our previously published model, we find that the quasi-continuum contribution is much smaller than the v(3)-ladder contribution to the susceptibility and always decreases with increasing laser energy. We find that the v(3) ladder is entirely responsible for self-focusing in SF(6) . The susceptibility curves show qualitative agreement with the 300-K self-focusing data of Nowak and Ham [Opt. Lett. 6, 185 (1981)] at CO(2)P(28), P(20), and P(10) in SF(6). Calculations with a two-dimensional diffraction-propagation code show good quantitative agreement with the Nowak and Ham data at CO(2)P(20) and P(10).
ABSTRACT
Two recent detailed models of multiple-photon excitation in SF(6) are compared. By performing equivalent vibration-rotation calculations using the two different basis sets, we have found that the results are in complete agreement. Rotational effects in both cases completely overshadow the vibrational structure, making a triply degenerate anharmonic oscillator model sufficient for describing multiple-photon excitation in SF(6).
