Fundamental studies of magneto-optical borogermanate glasses and derived optical fibers containing Tb3+

Journal of Materials Research and Technology

Steeve Morency¹  Roger G. Fernandes²  Marcelo Nalin³  Younès Messaddeq⁴  Douglas F. Franco⁵  Sandra H. Messaddeq⁵  Jorlandio F. Felix⁵  Valmor R. Mastelaro⁶  Hellmut Eckert⁷  Conrado R.M. Afonso⁷ 

[1] Centre d’Optique, Photonique et Laser, Université Laval, Quebec, Quebec, G1V 0A6, Canada;Corresponding author.;Centre d’Optique, Photonique et Laser, Université Laval, Quebec, Quebec, G1V 0A6, Canada;Department of Materials Engineering (DEMa), Federal University of São Carlos - UFSCar, 13565-905, São Carlos, SP, Brazil;Institute of Chemistry, São Paulo State University — UNESP, 14801-970, Araraquara, SP, Brazil;Institute of Physics, Applied Physics Center, University of Brasília, Brasília, DF, 70919-970, Brazil;São Carlos Institute of Physics, São Paulo University USP, 13566-590, São Carlos, SP, Brazil;

关键词: Magneto-optical glasses;    Verdet constant;    Faraday rotation;    Optical fibers;   

DOI  :  

来源: DOAJ

【 摘 要 】

New magnetic glass compositions, based on system (100-x) (60GeO2 -25B2O3 –4Al2O3 -10Na2O–1PbO) – xTb4O7 were prepared by the melt-quenching technique. The materials were systematically characterized with respect to their structural (XRD, EXAFS, XANES and Raman), thermal (DSC), morphological, optical, magnetic and magneto-optical (MO) properties. Morphological and magnetic measurements show the homogeneous distribution of the Tb3+ ions as the magnetic susceptibility increases proportionally to the rare earth content. The optical window covers the range from 0.5 up to 1.6 μm, limited by absorption due to 4f8 -> 4f7 5 d 1and 4f8 -> 4f8 transitions of Tb3+. XANES and EXAFS measurements at the Ge–K edge show that the germanium atoms are always tetrahedrally coordinated, while results at the Tb-LIII edge shows terbium atoms to be eight-coordinated and exclusively present in the oxidation state 3+ independently of the glass composition. MO measurements show that the Verdet constant (VB) increases linearly with the Tb3+ concentration reaching the value of −83.9 rad T−1m−1 at 650 nm for glass containing 8 mol% of Tb4O7. Good thermal stability (ΔT = 200 °C) allowed obtaining an optical fiber of a glass containing 4 mol% of Tb4O7 featuring VB values of −37.9, −23.6 and −5.89 rad T−1 m−1, at 500, 650 and 1550 nm, respectively.

【 授权许可】

Unknown