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Er doped waveguide amplifiers written with femtosecond laser in germanate glasses |
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| Authors: | Davinson Mariano da Silva Luciana Reyes Pires Kassab Massimo Olivero Thiago BN Lemos Douglas V da Silva ASL Gomes |
| Affiliation: | aDepartamento de Engenharia de Sistemas Eletrônicos, Escola Politécnica da USP, 05508-900 São Paulo, SP, Brazil;bLaboratório de Vidros e Datação, Faculdade de Tecnologia de São Paulo (FATEC-SP), 01124-060 São Paulo, SP, Brazil;cDepartment of Electronics, Politecnico di Torino, 10129 Torino, Italy;dDepartamento de Física, Universidade Federal de Pernambuco, 50670-901 Recife, PE, Brazil |
| Abstract: | The authors report the fabrication and characterization of active waveguides in GeO2–PbO–Ga2O3 glass samples doped with Er3+, written with a femtosecond laser delivering pulses of 150 fs duration at 1 kHz repetition rate. Permanent refractive index change was obtained and waveguides were formed under different laser pulse energies and scan velocities. The passive and active optical properties of the waveguides were investigated. The minimum value of propagation loss was of 4.8 dB/cm. Optical amplification at 1.5 μm under 980 nm excitation was observed showing a maximal internal gain of 2.7 dB/cm. |
| Keywords: | Laser processing of materials Active waveguide Germanate glass Ultrafast laser |
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