Abstract

Nonlinear optical response of a medium experiences a giant enhancement in one- and multiphoton resonances. This reduces required fundamental powers down to cw regime; however, it imposes severe limitations on the number density of the medium.¹ In the presence of a strong electromagnetic radiation resonances for a weak probe radiation experience splitting,² which exhibits itself in different ways in real and imaginary parts of linear and nonlinear susceptibilities. Later makes possible to combine minimum in absorption with maximum in squared module of nonlinear susceptibilities, responsible for optical generation, and at the same time with improvements in phase-matching and increasing density of the medium?

© 1994 IEEE