Nonlinear optical effects and the dielectric properties of crystals

Abstract

The role of nonlinear excitonic effects in absorption phenomena was analyzed. It was shown that nonlinear effects essentially determine the dielectric properties of molecular crystals, such as the refraction index and absorption coefficient. The kinematic exciton levels were analyzed too. It was shown that the nonconservation of excitons leads to four kinematic levels, corresponding to only one "normal" exciton level. © 1982.