Third- and fifth-order optical nonlinearities characterization using the D4σ-Z-scan method

摘要

We solved analytically the equations governing the evolution of the intensity and phase shift inside a nonlinear medium taking into account third- and fifth-order nonlinear susceptibilities. We give explicit expression of the propagation distance and the phase shift versus the output intensity. This solution is inverted numerically by means of Newtonu27s method. The result does not apply to some special cases due to the vanishing of coefficients, then analytical solutions are given, so that all the cases are covered. Combined with D4σ-Z-scan method, the third- and fifth-order nonlinear coefficients are measured at 532 nm and 1064 nm in the picosecond regime.