Broadband near-infrared emission property in Er~(3+)/Ce~(3+) co-doped silica-germanate glass for fiber amplifier

摘要

Er~(3+) doped and Er~(3+)/Ce~(3+) co-doped silica-germanate glasses were synthesized by high-temperature meltquenching technique. A detailed study of the 1.53 lm spectroscopic properties and thermal stability was presented in this work. The absorption spectra, 1.53 lm emission spectra and fluorescence lifetimes were measured and investigated, along with the quantitative calculations and analyses of Judd-Ofelt intensity parameters, stimulated absorption and emission cross-sections and the product of FWHM × σ_(em)~P. It was found that the prepared samples have outstanding thermal stability (T_g = 585 ℃), large FWHM (77 nm and 108 nm) and high stimulated emission cross-sections (9.55 × 10~(-28) cm~3 and 8.72 × 10~(-28) cm~3) of Er~(3+). The 1.53 lm fluorescence intensity improved significantly with the introduction of Ce~(3+). Furthermore, the wavelength dependent gain coefficient G(λ) of ~4I_(13/2)→~4I_(15/2) transition of Er~(3+) was determined by means of the absorption and emission cross-sections. The results indicate that the developed glass codoped with Er~(3+)/Ce~(3+) is a promising gain medium applied for broadband amplifier pumped with a 980 nm laser diode.