10.high refractive index magneto-optical glasses in the system of teo2-wo3-bi2o3 and twpb.pdf

High refractive index and magneto±optical glasses in the systems TeO 2 ±WO 3 ±Bi 2 O 3 and TeO 2 ±WO 3 ±PbO N.V. Ovcharenko, T.V. Smirnova * S.I. Vavilov State Optical Institute, Babushkin str., 36/1, St. Petersburg, 193171, Russia Received 24 November 2000 Abstract TeO 2 -based glasses have extremely high refractive indices up to 2.30. In this paper are presented glass formation areas, crystallization ability, optical parameters and physical properties of glasses in the systems TeO 2 ±WO 3 ±Bi 2 O 3 and TeO 2 ±WO 3 ±PbO. The structure of the glasses was studied by means of IR spectroscopy. Values of the magneto±optical parameter of the same glasses the Verdet constant) are also given. Ó 2001 Published by Elsevier Science B.V. PACS: 42.70.Ce; 78.20.Ci; 78.20.Ls; 78.30.j 1. Introduction TeO 2 -based glasses have recently become of great interest for use in optical communication systems [1]. Tellurite glasses are well known to have the highest refractive indices among oxide glasses in the visible and near IR region [2]. The systems TeO 2 ±WO 3 ±Bi 2 O 3 and TeO 2 ±WO 3 ±PbO are the most promising in this respect because they contain oxides of the heaviest metals, such as tungsten, lead and bismuth [3,4]. In this work, the glass formation regions and the dependencies of the physico±chemical properties on glass composition were investigated. The glass structure was determined by IR re¯ection spectroscopy. 2. Experimental procedure All the glasses in the mentioned systems were synthesised in gold crucibles, because the com- ponents are very reactive and crucibles made from other materials were destroyed during the melting process. For example, we found that glasses melted in platinum crucibles acquired a purple colour due to the infusion of colloidal platinum. The melting temperature should not be higher than 750±800 °C, in order to avoid the dissolution of the crucible material and the re- duction of TeO 2 to Te. The glasses were synthesised during 30 min, then all samples were annealed at about 370 °C and cooled at a rate of about 15 °C/h. The glass structure in tellurite systems was studied by IR re¯ection spectroscopy Perkin± Elmer 580). For glasses in the system TeO 2 ± WO 3 ± Bi 2 O 3 , Raman spectra were also measured. The refractive indices n e ; n F 0 ; n C 0 were measured using a goniometer GS5 made in USSR, Optical and Mechanical Factory, Zagorsk, Russia) Journal of Non-Crystalline Solids 291 2001) 121±126 www.elsevier.com/locate/jnoncrysol * Corresponding author. Address: Shkolnaya str., 64, ap. 40, St. Petersburg, 197183, Russia; Tel.: +7-812 430 2529. E-mail address: [email protected] T.V. Smir- nova). 0022-3093/01/$ - see front matter Ó 2001 Published by Elsevier Science B.V. PII: S 0 0 2 2 - 3 0 9 3 0 1 ) 0 0 7 9 3 - 1

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