Optical Nonlinearities of Al₂O₃ Glasses with CdS Microcrystallites

Fabrication of Al 2 O 3 glasses with CdS microcrystallites by means of the sol-gel method, as well as their linear and nonlinear optical characteristics, is reported for the first time. The shift in the wavelength of the absorption edge through a quantum size effect was clearly observed for the CdS-doped Al 2 O 3 prepared by changing the annealing temperature. A large nonlinear absorption and refractive index were obtained because a high CdS microcrystallite concentration was achieved through the sol-gel method.