The Second-order Optical Nonlinearity Of Chalcogenide Glasses And Films

With the development of optical fiber communication and continuous research on all-optical computer, it has become more and more essential outstanding character of second-order nonlinearity optical materials. As one kind of second-order nonlinearity optical materials, glass own a series of excellent characters and will be used widely in the future.In order to exploit high performance second order optic materials, and because of the formal foundation that the region of polarization of chalcogenide glasses was exits only in the superficial layer, this paper wanted to investigate the properties and characteristic of chalcogenide glass films.First, various content of arsenic in the Ge-As-Se systems was made by sealed quarts tubes. Then the polarization mechanism of Ge-As-Se glass after electron-beam irradiation and temperature/ electric-field poling was studied by TSDC(thermally stimulated depolarization current)technique, and also research the micro-cosmic mechanism. Finally, we made chalcogenide glass films by CBD (chemical bath deposition) and vacuum thermal evaporation.The experiment results indicate that the Ge-As-Se systems's glass formation ability was very good in the Se-rich area, bulk glasses could be obtained even cooled naturally in air. After the electron-beam irradiation and temperature/electric-field poling, there are TSDC peak in both poling ways, but the latter was better because the cause of the latter is not only including the emission of the second electron and the existence of the absorbing electron, but also including of the tropism doublet. It is show that because there are many structure defects in the chalcogenide glass, it is easy to polarization, and also maybe had better second-order optical nonlinearity. Then, from the research result of ZnxCd(1-x) S film ,we find that it can replace part of CdS in the solar cells when X is between 0.4 and 0.6. At last, we can calculate the optical constants of chalcogenide films upon a transparent substrate only from the optical transmission and reflection spectrum.