Er3+-doped SiO2-based glasses – An exploration of structural, visible, chromatic, and NIR fluorescence characteristics. (March 2022) - Devarajulu, G.
Highlights: Er 3+ ions doped SiO2 -based glasses are prepared by melt-quenching technique. Physical, structural, optical, and fluorescence features are evaluated. J-O parameter Ω2 = 7.79 – 9.29×10 −20 cm 2 is increased with SiO2 concentration. Radiative characteristics are computed and compared with other Er 3+ : glasses. Highest σemi = 9.18×10 −21 cm 2 (1.53 μm) apt for optical amplifiers in NIR region. Abstract: SiO2 -based glasses doped with 1 mol% Er 3+ were fabricated via melt-quench process and their structural and visible and NIR (near-infrared) fluorescence features have been investigated. Calculated Judd–Ofelt (J–O) intensity parameters that were deduced from absorption spectra are applied to reckon different radiative factors. Visible emission spectra and decay profiles (for 4 S3/2 → 4 I15/2 transition) were registered upon λexci. = 379 nm. CIE (Commission International de I'Eclairage), CCT (correlated color temperature), and CP (color purity) values were evaluated from the emission spectra. Also, a NIR luminescence band ( 4 I13/2 → 4 I15/2 transition) was identified by 980 nm LD (laser diode). Later, emission cross-section [ (σemi ) stimulated, (σ M emi ) from Mccumber theory] values were computed for observed NIR emission. Highest σemi and gain bandwidth ( σemi × ∆λeff ) were obtained to be 9.18×10 −21 cm 2 and 517×10 −28 cm 3 accordingly for 4 I13/2 → 4 I15/2 transition. Graphical abstract: Image, graphical abstract