کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1482678 | 991573 | 2011 | 6 صفحه PDF | دانلود رایگان |
Molecular orbital calculations of two phospho-tellurite model clusters were performed to clarify the origins of the Raman bands in the Stokes region of over 1000 cm− 1 in phospho-tellurite glasses. The Raman bands could be attributed to two components of 900–1050 cm− 1 of symmetrical stretching vibrations of PO4 units and 1050–1200 cm− 1 of anti-symmetrical stretching vibrations of PO4 units. It was also clarified that the top of the valence band of phospho-tellurite glasses consists of the lone pair electrons in a TeO4 + 1 unit and the bottom of the conduction band of the glass consists of the antibonding hybrids of Te 5p and O 2p orbitals in the equatorial plane of a TeO4 unit.We have developed new phospho-tellurite glasses which have the Raman gain peak of 30 times as large as silica glass or the Raman gain bandwidth of more than 1200 cm− 1.
Journal: Journal of Non-Crystalline Solids - Volume 357, Issue 14, 1 July 2011, Pages 2702–2707