Second harmonic generation in electrically poled TeO2-based glasses

Katsuhisa Tanaka; Kenichi Kashima; Koichi Kajihara; Kazuyuki Hirao; Naohiro Soga; Akihiro Mito; Hiroyuki Nasu

doi:10.1117/12.188709

3 October 1994 Second harmonic generation in electrically poled TeO₂-based glasses

Katsuhisa Tanaka, Kenichi Kashima, Koichi Kajihara, Kazuyuki Hirao, Naohiro Soga, Akihiro Mito, Hiroyuki Nasu

Proceedings Volume 2289, Doped Fiber Devices and Systems; (1994) https://doi.org/10.1117/12.188709
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

Optical second harmonic intensity has been measured for electrically poled several TeO₂- based glasses in order to discuss relation between second harmonic intensity and glass structure. The glass systems, ZnO-TeO₂, BaO-TeO₂, WO₃-TeO₂ and ZnO- BaO-TeO₂, have been chosen because these systems possess relatively extended glass- forming region. The second harmonic intensity increases with an increase in the concentration of ZnO in the binary ZnO-TeO₂ system. It is known that an addition of ZnO to TeO₂ glass converts TeO₄ trigonal bipyramids to TeO₃ trigonal pyramids and leads to creation of non-bridging oxygens. We presume that these tellurite glass structural units, which are lacking in center of symmetry, are oriented to the direction of external dc electric field and that the orientation takes place more easily in the ZnO-rich glass because the glass-network structure is more flexible owing to the presence of trigonal pyramids and non-bridging oxygens. While the second harmonic generation is clearly observed in ZnO-TeO₂ and WO₃-TeO₂ glasses, it does not occur in BaO-TeO₂ glasses under the present poling conditions. We speculate that the orientation of structural units scarcely occurs in the BaO-TeO₂ glasses because the external field mainly causes the electron polarization of Ba²⁺ ions.

Citation Download Citation

Katsuhisa Tanaka, Kenichi Kashima, Koichi Kajihara, Kazuyuki Hirao, Naohiro Soga, Akihiro Mito, and Hiroyuki Nasu "Second harmonic generation in electrically poled TeO₂-based glasses", Proc. SPIE 2289, Doped Fiber Devices and Systems, (3 October 1994); https://doi.org/10.1117/12.188709

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