Nonlinear optical pulse propagation in molecular media.

摘要: We model the response of a molecular medium to an intense pulse light. begin by reducing Maxwell-Bloch equations for multilevel system set simplified propagation equations. thereby obtain expressions frequency, temperature, and field intensity dependence ground excited electronic state absorption cross sections, emission section, as well temperature decay rate state. The phenomena saturation, excited-state absorption, optically induced dichroism birefringence, vibronic energy transfer, alignment, matter-field interaction energy, rotational diffusion are considered within general formalism describing light in medium. find that section (emission) photon is not identical excitation (deexcitation) via interaction. This explained terms balance between matter, radiation, matter-radiation interaction, bath responsible broadening transitions. inequality these sections determines whether supplies or draws from thermal bath. rise vibrational molecules subjected short shown significantly affect pulse. alignment resulting saturation ground-state transition polarized laser effects orientational including determined. As example we consider Rhodamine 6G solution. fit parameters determine frequency ground- compare with experimentally determined sections. describe whose temporal width comparable time dye solution calculate polarization probe signals.