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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

Full text
Author(s):
Franco, Douglas F. [1] ; Fernandes, Roger G. [1] ; Felix, Jorlandio F. [2] ; Mastelaro, Valmor R. [3] ; Eckert, Hellmut [3] ; Afonso, Conrado R. M. [4] ; Messaddeq, Younes [5, 1] ; Messaddeq, Sandra H. [5] ; Morency, Steeve [5] ; Nalin, Marcelo [1]
Total Authors: 10
Affiliation:
[1] Sao Paulo State Univ UNESP, Inst Chem, BR-14801970 Araraquara, SP - Brazil
[2] Univ Brasilia, Appl Phys Ctr, Inst Phys, BR-70919970 Brasilia, DF - Brazil
[3] Sao Paulo Univ USP, Sao Carlos Inst Phys, BR-13566590 Sao Carlos, SP - Brazil
[4] Fed Univ Sao Carlos UFSCar, Dept Mat Engn DEMa, BR-13565905 Sao Carlos, SP - Brazil
[5] Univ Laval, Ctr Opt Photon & Laser, Quebec City, PQ G1V 0A6 - Canada
Total Affiliations: 5
Document type: Journal article
Source: JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T; v. 11, p. 312-327, MAR-APR 2021.
Web of Science Citations: 0
Abstract

New magnetic glass compositions, based on system (100-x) (60GeO(2) -25B(2)O(3) -4Al(2)O(3) -10Na(2)O-1PbO) -xTb(4)O(7) 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 mu m, limited by absorption due to 4f(8) -> 4f(7) 5 d (1)and 4f(8) -> 4f(8) transitions of Tb3+. XANES and EXAFS measurements at the GeeK edge show that the germanium atoms are always tetrahedrally coordinated, while results at the Tb-L-III edge shows terbium atoms to be eight-coordinated and exclusively present in the oxidation state 3thorn independently of the glass composition. MO measurements show that the Verdet constant (V-B) increases linearly with the Tb3+ concentration reaching the value of -83.9 rad T(-1)m(-1) at 650 nm for glass containing 8 mol % of Tb4O7. Good thermal stability (DT 1/4 200 degrees 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. (c) 2021 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). (AU)

FAPESP's process: 18/19272-4 - Production of heavy metal optical fibers to be used in Faraday rotators
Grantee:Douglas Faza Franco
Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
FAPESP's process: 13/07793-6 - CEPIV - Center for Teaching, Research and Innovation in Glass
Grantee:Edgar Dutra Zanotto
Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC
FAPESP's process: 16/16900-9 - Preparation of heavy metal oxide glasses fibers with optical and magneto-optical properties
Grantee:Douglas Faza Franco
Support Opportunities: Scholarships in Brazil - Post-Doctoral