Luminescence and decay trends for NIR transition (4I13/2→4Il5/2) at 1.5μm in Er3+-doped LBT glasses
2011; Elsevier BV; Volume: 33; Issue: 8 Linguagem: Inglês
10.1016/j.optmat.2011.02.003
ISSN1873-1252
AutoresJoão Coelho, João Azevedo, Graham Hungerford, Sooraj Hussain Nandyala,
Tópico(s)Solid State Laser Technologies
ResumoErbium oxide (0.5–4 mol%) doped lithium boro tellurite (LBT) glasses have been prepared and the NIR emission band at 1.5 μm characterized. By pumping with LED excitation sources at 495 nm and 970 nm, a broader NIR emission transition (4I13/2 → 4Il5/2) was observed. The Judd–Ofelt intensity parameters (Ω2 = 7.36 × 10−20 cm2; Ω4 = 2.79 × 10−20 cm2 and Ω6 = 2.32 × 10−20 cm2) were derived for the 1 mol% Er3+-doped LBT glass and compared with other tellurite host glasses. The full width at half the maximum (FWHM), stimulated emission cross-sections (σPE) and lifetimes (τmea) for NIR luminescence transitions 4I13/2 → 4I15/2 are reported. For both excitation wavelengths, overall the decay times were found to decrease with increasing erbium content. The present study describes the excitation dependent luminescence properties for this NIR transition.
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