Magneto-optical borogermanate glasses and fibers containing Tb3+

Author(s)

Franco, Douglas F. ^[1] ; Ledemi, Yannick ^[2] ; Correr, Wagner ^[2] ; Morency, Steeve ^[2] ; Afonso, Conrado R. M. ^[3] ; Messaddeq, Sandra H. ^[2] ; Messaddeq, Younes ^{[1, 2]} ; Nalin, Marcelo ^[1]

Affiliation

^[1] Sao Paulo State Univ UNESP, Inst Chem, BR-14800060 Araraquara, SP - Brazil

^[2] Univ Laval, Ctr Opt Photon & Laser, 2375 Rue Terrasse, Local 2131, Quebec City, PQ G1V 0A6 - Canada

^[3] Fed Univ Sao Carlos UFSCar, Dept Mat Engn DEMa, Sao Carlos, SP - Brazil

• Document type: Journal article
• Source: SCIENTIFIC REPORTS; v. 11, n. 1 MAY 10 2021.
• Web of Science Citations: 0

Abstract

New glass compositions containing high concentrations of Tb3+ ions were developed aiming at the production of magneto-optical (MO) fibers. This work reports on the structural and MO properties of a new glass composition based on (100 - x)(41GeO(2)-25B(2)O(3)-4Al(2)O(3)-10Na(2)O-20BaO) - xTb(4)O(7). Morphological analysis (HR-TEM) of the sample with the highest concentration of Tb3+ ions confirmed the homogeneous distribution of Tb3+ ions and the absence of nanoclusters. All the samples presented excellent thermal stability against crystallization (Delta T>100 degrees C). An optical fiber was manufactured by a fiber drawing process. The UV-Vis spectra of the glasses showed Tb3+ electronic transitions and optical windows varying from 0.4 to 1.6 mu m. The magneto-optical properties and the paramagnetic behaviors of the glasses were investigated using Faraday rotation experiments. The Verdet constant (V-B) values were calculated at 500, 650, 880, 1050, 1330, and 1550 nm. The maximum V-B values obtained at 650 and 1550 nm for the glass with x=18 mol% were -128 and - 17.6 rad T-1 m(-1), respectively. The V-B values at 500 and 1550 nm for the optical fiber containing 8 mol% of Tb4O7 were - 110.2 and - 9.5 rad T-1 m(-1), respectively, while the optical loss at around 880 nm was 6.4 dB m(-1). (AU)

• 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
• 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: 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