Abstract:
In this research analytical and numerical calculations have been made to identify
the dependence of third order nonlinear refractive index and absorption coefficient
on optical laser intensity and transition energy. Analytical expressions for the thirdorder nonlinear absorption coefficients and refractive index changes are obtained by
using compact density matrix approach. The obtained result indicates that both third
order NL absorption coefficient and refractive index changes experience a blue shift by
increasing the transition energy. Moreover high laser intensity induces a pronounced
magnitude of third order NL absorption coefficient and refractive index changes.
