STRUCTURE AND NONLINEAR-OPTICAL PROPERTIES OF ZINC SELENIDE FILMS

The linear and nonlinear properties of polycrystalline zinc selenide f ilms are investigated as a function of their deposition conditions. It is shown that the complex nonlinear refractive index correlates with the crystallite dimensions in the deposited film. This correlation sug gests the localization of electrons in surface states of the crystalli tes as a possible mechanism of optical nonlinearity in zinc selenide f ilms excited in the transparency band at a wavelength of 633 nm, (C) 1 997 American Institute of Physics.