Optical characterization, luminescence properties of Er3+ and Er3+/Yb3+ co-doped tellurite glasses for broadband amplification

Seshadri Meruva; Barbosa Luiz Carlos; Ferencz Junior Julio Alberto Peres

doi:10.1117/12.2037000

7 March 2014 Optical characterization, luminescence properties of Er³⁺ and Er³⁺/Yb³⁺ co-doped tellurite glasses for broadband amplification

Seshadri Meruva, Barbosa Luiz Carlos, Ferencz Junior Julio Alberto Peres

Author Affiliations +

Proceedings Volume 8961, Fiber Lasers XI: Technology, Systems, and Applications; 896132 (2014) https://doi.org/10.1117/12.2037000
Event: SPIE LASE, 2014, San Francisco, California, United States

Abstract

In the present paper, optical absorption and emission spectra and luminescence decay lifetimes of different concentrations, 0.1, 0.3, 0.5, 0.7 and 1.0 mol% of Er³⁺ and 0.1Er³⁺/0.5Yb³⁺ co-doped tellurite glasses (TeO₂-Bi₂O₃-ZnONb₂O₅) were reported. Judd-Ofelt intensity parameters were determined and used to calculate spontaneous radiative transition probabilities (A_rad), radiative lifetimes (τ_R), branching ratios (β) and stimulated emission cross-sections (σ_P) for certain emission transitions. NIR emission at 1.5μm and up-conversion spectra of Er³⁺ and Er³⁺/Yb³⁺ co-doped tellurite glasses were measured under excitation wavelength of 980 nm. The absorption, emission and gain cross-sections for ⁴I_13/2→⁴I_15/2 transition of Er³⁺ are determined. The peak emission cross-section of this transition is found to be higher (9.95×10^-21 cm²) for 0.1 mol% of Er³⁺ and lower (6.81×10^-21 cm²) for 1.0 mol% of Er³⁺ doped tellurite glasses, which is comparable to other oxide glasses. The larger peak emission cross-section for lower concentration of Er³⁺ is due to the high refractive index of glass matrix (2.1547), relation established from Judd-Ofelt theory. The observed full-widths at half maxima (FWHM) for lower and higher concentrations of Er³⁺ are 64nm and 96 nm respectively. The larger values of FWHM and peak emission cross-sections are potentially useful for optical amplification processes in the design of Erbium doped fiber amplifiers (EDFs). Under 980 nm excitation three strong up-conversion bands were observed at 530nm, 546nm and 665nm. The pump power dependent intensities and mechanisms involved in the up-conversion process have been studied. The luminescence decay profiles for ⁴I_13/2 level were reported for all glass matrices.

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Seshadri Meruva, Barbosa Luiz Carlos, and Ferencz Junior Julio Alberto Peres "Optical characterization, luminescence properties of Er³⁺ and Er³⁺/Yb³⁺ co-doped tellurite glasses for broadband amplification", Proc. SPIE 8961, Fiber Lasers XI: Technology, Systems, and Applications, 896132 (7 March 2014); https://doi.org/10.1117/12.2037000

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