Waveguides fabrication by femtosecond laser in Tb3+/Yb3+ doped CaLiBO glasses
Abstract: Borate glasses present the ability to host various modifier ions and, therefore, are adaptable for a wide range of applications. Specifically, calcium-lithium tetraborate (CaLiBO) glasses doped with rare earths have been investigated for applications involving energy transfer processes. In this work, waveguides were inscribed by femtosecond laser microfabrication in CaLiBO glasses containing Tb3+ and Yb3+ ions, displaying emission in the green region. Single-mode guiding at 632.8 nm, with propagation losses of approximately 2.0 dB/cm, was obtained in 7.0-mm long waveguides with a diameter on the order of 2 μm, produced in the glass bulk, at approximately 100 μm below the sample surface. By coupling 488 nm light, the fabricated waveguide showed the capability of guiding the typical emission of Tb3+ ions. Such glasses containing rare earths could be suitable for the development of green light-emitting microdevices.
Author(s): Santos, S. N. C.; Almeida, G. F. B.; Almeida, J. M. P.; Hernandes, A. C.; Mendonca, C. R.
Optics & Laser Technology
Published: August 2021, Volume 140, 107030
DOI: https://doi.org/10.1016/j.optlastec.2021.107030
CDMF
The CDMF, hosted at the Federal University of São Carlos (UFSCar), is one of the Research, Innovation and Dissemination Centers (RIDC) supported by the São Paulo State Research Support Foundation (Fapesp), and also receives investment from the National Council Scientific and Technological Development (CNPq), from the National Institute of Science and Technology of Materials in Nanotechnology (INCTMN).
