Production and characterization of femtosecond laser-written double line waveguides in heavy metal oxide glasses

Autor(es)

da Silva, Diego Silverio ^[1] ; Wetter, Niklaus Ursus ^[1] ; de Rossi, Wagner ^[1] ; Pires Kassab, Luciana Reyes ^[2] ; Samad, Ricardo Elgul ^[1]

Afiliação do(s) autor(es)

^[1] Inst Pesquisas Energet & Nucl IPEN CNEN SP, Ctr Lasers & Aplicacoes, 2242 A Prof Lineu Prestes, Sao Paulo - Brazil

^[2] CEETEPS, Fac Tecnol Sao Paulo, Lab Tecnol Mat Foton & Optoeletron, BR-01124060 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Optical Materials; v. 75, p. 267-273, JAN 2018.
• Citações Web of Science: 4

Resumo

We report the fabrication and characterization of double line waveguides directly written in tellurite and germanate glasses using a femtosecond laser delivering 30 mu J, 80 fs pulses at 4 kHz repetition rate. The double line waveguides produced presented internal losses inferior to 2.0 dB/cm. The output mode profile and the M-2 measurements indicate multimodal guiding behavior. A better beam quality for the GeO2 - Pbo waveguide was observed when compared with TeO2 - ZnO glass. Raman spectroscopy of the waveguides showed structural modification of the glassy network and indicates that a negative refractive index modification occurs at the focus of the laser beam, therefore allowing for light guiding in between two closely spaced laser written lines. The refractive index change at 632 nm is around 10(-4), and the structural changes in the laser focal region of the writing, evaluated by Raman spectroscopy, corroborated our findings that these materials are potential candidates for optical waveguides and passive components. To the best of our knowledge, the two double line configuration demonstrated in the present work was not reported before for germanate or tellurite glasses. (C) 2017 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 16/02326-9 - Microusinagem com laser de pulsos ultracurtos aplicada na produção e controle de circuitos optofluídicos
• Beneficiário: Diego Silvério da Silva
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 13/26113-6 - Microusinagem com laser de pulsos ultracurtos aplicada na produção e controle de circuitos optofluídicos
• Beneficiário: Wagner de Rossi
• Modalidade de apoio: Auxílio à Pesquisa - Temático