“…A semiconductor material which has been widely studied for its optical properties is Indium Antimonide 1] { 26]. It shows a usable optical nonlinearity at room temperature in the 9-11 m wavelength range of the CO 2 laser 2, 26,5,14,10,11,13,17,18,16,15,9,23,27,7,28] and it is therefore important to develop e ective models of its behaviour, and to determine the values of its physical parameters.…”