Family of lithium zinc fluoroborate glasses with 15ZnF 2 -10BaO-8Al 2 O 3 –12Li 2 O-(55-x) B 2 O 3 -xEr 2 O 3 (x = 0.5, 0.7, 1.1, 1.3 and 1.5 mol%) composition were prepared by conventional melt-quench method. The glasses were characterized to study their structural, physical, optical and radiative properties. The amorphous characteristic of glass was noticed in X-Ray Diffraction pattern. A modification in structure was observed as density values increased with Er 2 O 3 content. UV–Vis–NIR transitions of Er 3+ in the host matrix were identified through absorption spectra. Covalent nature of bonding between Er 3+ ions and their surrounding ligands was observed through bonding parameter and Judd-Ofelt parameters. Red shift of the fundamental absorption edge in the absorption spectra and decreasing indirect and direct band gaps with increasing Er 3+ concentration jointly confirmed the role of Er 3+ ions as network modifier. Hypersensitive transitions of Er 3+ ion namely 4 I 15/2 → 2 H 11/2 & 4 I 15/2 → 4 G 11/2 were interpreted through their higher oscillator strengths when compared to other transitions. Emission spectra recorded at 980 nm excitation showed a peak corresponding to 4 I 13/2 → 4 I 15/2 NIR transition of erbium ion. Stimulated emission cross section of Er0.5 sample, gain bandwidth and Figure of Merit were found to be 16.79 × 10 −21 cm 2 , 1225.83 × 10 −28 cm 3 and 37.36 × 10 −24 cm 2 s respectively. Photoluminescence decay curve of Er0.5 sample was well-fitted to single exponential first order function. The experimental decay lifetime τ exp for the 4 I 13/2 level was measured to be 0.34 ms. The wide frequency range of FWHM (1.02–1.67 × 10 13 Hz) and high values of radiative parameters make the glass a suitable candidate as optical amplifier and NIR laser material.
|Number of pages||9|
|Journal||Infrared Physics and Technology|
|Publication status||Published - 01-05-2019|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Condensed Matter Physics