Abstract
With high refractive indices, appropriate solubility of rare earth, low phonon energy and transparency from the visible to 10 µm, a Ga-Ge-Sb-S system allows emission from Nd3+ ions in the near- and mid-IR spectral ranges. The glass transition temperature, density, expansion coefficient, and near and mid-IR refractive indexes were measured on bulk samples. Their glass network structures were analyzed by Raman scattering spectrometry, NMR of 71Ga and extended X-ray absorption fine structure (EXAFS, K-edge of Ga, Ge, Sb, S and Nd). The absorption and emission spectra of neodymium doped sulfide glasses were recorded from the visible to the mid-IR. Excited state lifetimes were measured for several transitions. The lifetimes decrease with the concentration of Nd3+, especially for the 4I13/2 and 4I11/2 levels. The spectroscopic parameters were determined by the Judd-Ofelt method, allowing the calculation of cross-section emissions and the evaluation of quantum yields. Optical attenuation and emission measurements of fiber were also performed with a broad 4.7-5.7 µm emission band in the mid-IR.
Highlights
Chalcogenide glasses are interesting materials due to their wide glass formation region, optical transparency window and high refractive indices
With the variation of chemical composition in this system, the band-gap can be shifted to lower wavelength which could allow a better pumping at 815 nm required for Nd3+ ions
Several compositions were synthetized with an objective of blue-shift of the band-gap by changing the concentration between the different chemical elements
Summary
Chalcogenide glasses are interesting materials due to their wide glass formation region, optical transparency window and high refractive indices They are well known as host materials for rare earth ions [1,2,3,4]. They possess low phonon energy (~300-450 cm−1 for sulfides, ~200-350 cm−1 for selenides and 150-250 cm−1 for tellurides) that limits the nonradiative multiphonon relaxation rates All these properties result in high quantum efficiencies for rare earth ion transitions in chalcogenide and chalcohalide glasses. The quaternary Ga-Ge-Sb-S glass system doped with Nd3+ ions was selected to avoid the presence of arsenic This system contains gallium, which allows a better solubility of RE3+ ions than other chalcogenide matrices without gallium [16,17,18,19]. In order to blue-shift the optical band-gap, several compositions of the Ga-Ge-Sb-S quaternary system were fabricated and their physicochemical and optical properties have been studied
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
