NONLINEAR OPTICAL EFFECTS AND DEVICES: Nonlinear susceptibility of InSb at the wavelength of 10.6
The nonlinear susceptibilities of InSb were determined at 10.6 µ and their relaxation times were found. In the case of noncoherent signal and reference waves the reflection due to the four-wave interaction was found to be dominated by the third-order nonlinear susceptibility χ(3) ≈10−7 cgs esu with a relaxation time ~10−11 sec. In the coherent interaction case the reflection was dominated by the fifth-order nonlinear susceptibility χ(5)≈10−8 cgs esu with a relaxation time ~10−8 sec.