Optical properties of Er³⁺ doped alkali chlorophosphate glasses for optical amplifiers

Pradeesh, K., Oton, C.J., Agotiya, V.K., Raghavendra, M. and Prakash, G.Vijaya (2008) Optical properties of Er³⁺ doped alkali chlorophosphate glasses for optical amplifiers. Optical Materials, 31 (2), 155-160. (doi:10.1016/j.optmat.2008.02.007).

Abstract

A new class of Erbium doped glasses with compositions xNa₂O—(60–x)PbCl₂—40P₂O₅ (x = 0, 10, 20 and 30) were fabricated and characterized for optical properties. Absorption spectra were analyzed for important Judd–Ofelt parameters from the integrated intensities of various Er³⁺ absorption bands. A systematic correlation between the Judd–Ofelt parameter Ω₂ and the covalent nature of the glass matrix was observed, due to the increased role of bridging oxygens in the glass network. Photoluminescence (PL) and its decay behavior studies were carried out for the transition ⁴I_13/2 to ⁴I_15/2. The PL broadness and life times were typically in the range of 40–60 nm and 2.13–2.50 ms, respectively. These glasses show high transparency, high refractive index, shorter life times and, most importantly, these glasses were capable of being doped with larger concentrations of Er³⁺ (up to 4 wt%). Optical performance of these doped phosphate glasses suggesting the suitability of these glasses for optical fibre/waveguide amplifiers.

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