Abstract
We report on a new Yb3+/Tm3+/Ho3+ co-doped bismuth silicate glass: SiO2–Bi2O3–R2O (R=Li, Na, K) for 2μm fiber lasers. Bi2O3 was introduced into alkali silicate glass to optimize 2μm emission properties. Physical, chemical and spectroscopic properties of Yb3+/Tm3+/Ho3+ co-doped SiO2–Bi2O3–R2O (SBR) glass were presented. The Yb3+/Tm3+/Ho3+ co-doped SBR glass shows excellent thermal stability (ΔT=162°C), an intense 2.0μm emission pumped by 980nm LD with a lifetime of 1.33ms and width of 168nm, large maximum emission cross section of Ho3+ (5.3×10−21cm2), thus large σemτ product (7.049×10−24cm2s), which suggest its application in 2μm fiber lasers.
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