Femtosecond laser-written double line waveguides in germanate and tellurite glasses

• Main Author: SILVA, DIEGO S. da
• Publication Date: 2018
• Other Authors: WETTER, NIKLAUS U., ROSSI, WAGNER de, SAMAD, RICARDO E., KASSAB, LUCIANA R.P., LASER APPLICATIONS IN MICROELECTRONIC AND OPTOELECTRONIC MANUFACTURING (LAMOM), 23th
• Format: Conference object
• Source: Repositório Institucional do IPEN
• Download full: http://repositorio.ipen.br/handle/123456789/29006
• topic: waveguides; lasers; laser radiation; germanates; tellurium oxides; glass; raman spectra; raman spectroscopy

The authors report the fabrication and characterization of passive waveguides in GeO2???PbO and TeO2???ZnO glasses written with a femtosecond laser delivering pulses with 3??J, 30??J and 80fs at 4kHz repetition rate. Permanent refractive index change at the focus of the laser beam was obtained and waveguides were formed by two closely spaced laser written lines, where the light guiding occurs between them. The refractive index change at 632 nm is around 10-4 . The value of the propagation losses was around 2.0 dB/cm. The output mode profiles indicate multimodal guiding behavior. Raman measurements show structural modification of the glassy network. The results show that these materials are potential candidates for passive waveguides applications as low-loss optical components.