Study On Second-order Nonlinear Optical Properties Of As-S Chalcogenide Glasses And Their Films

With the development of optical fiber communication and continuous research on photoelectric functional devices .It has become more and more essential to obtain of second-order nonlinear materials with outstanding characteristic. Glasses own a series of excellent characters and will be used widely in the future.In order to exploit second-order nonlinear optical materials with high performance, the polarization mechanism and relation between polarization technology and second-order nonlinearity were studied on the temperature/electric fields poled chalcogenide glasses and films in term of TSDC (thermally stimulated depolarization current) measurement and Maker fringe. Researches were carried out on the As-S-Se glass system by sealed quartz tubes to make glasses in this paper, on As-S glass system by spin-coating and RF sputtering to make film. The chalcogenide glass and films were polarized under the condition of temperature/electric field theaThe results indicated that As-S-Se glasses system have good glass-forming ability. The large bulk samples can be obtained. Their Maker fringe is very obvious after polling. The relaxation time is long in term of measurement of TSDC under room temperature .the poled region lied in the anode surface. With the increasing of poling time and poling voltage, the intensity of SH become stronger. The result that stronger sign of TSDC and Make fringe lie in the sample with higher contend of Se show that Se is benefited to the higher second-order nonlinearity.Arsenic sulfide chalcogenide film with high transparence and excellent quality was made by sputtering. It is very surprising that Maker fringe always is remarkable whether the sample is poled or not This phenomenon indicates that the film has been poled during the fabrication, duing to the influence of electric field and magnetic fieldArsenic sulfide chalcogenide film also was obtained by spin-coating. The effect of heat-treatment technology on some properties such as refractive index, thickness was discussed. The increase of annealing time and temperature leads to rise ofrefiactive and decrease of thickness. This method is simple and convenient, and provides a new way to make chalcogenide films, but need to be improved.