~3 μm uorescence behavior of Ho3+ doped transparent tellurite glass ceramics

Highlights: • ~3 μm emission of Ho³⁺ doped tellurite GC was studied for the rst time. • The emission cross section for 3 μm emission in GCH reached to 1.76 × 10⁻²⁰ cm². • Excited by 1950 nm thulium-doped fiber lasers, the 3 μm emisson were observed. • The emission intensity of GCH in the range of 2700–2760 nm increased nine times. • The ~3 μm emission spectrum in GCH narrowed obviously. -- Abstract: The ~3 μm uorescence was investigated in the Ho₂O₃-doped transparent tellurite glass-ceramic for the first time. The branching-ratios and emission cross-sections were calculated. The glass-ceramics had high branching-ratio (20.5%) and large emission cross-section (1.76 × 10⁻²⁰ cm²) corresponding to Ho³⁺:⁵I₆→⁵I₇ transition. After crystallization, the ~3 μm uorescence intensity increased obviously excited by 640 nm laser diode. The broadband uorescence about 3 μm was observed under excitation by a 1950-nm thulium-doped fiber lasers. The increased ~3 μm uorescence intensity and narrowed spectrum demonstrated the Ho³⁺ ions embedded into the crystalline phase. These results indicate that the tellurite glass-ceramics may be a promising material for mid-infrared lasers.