Abstract
In this paper, we report 2μm emission in bismuth germanate glasses doped with Ho3+/Tm3+ ions enhanced by surface plasmon resonance of Ag nanoparticles (NPs) under 800nm laser excitation. We perform broadband mid-infrared emissions from 1700nm to 2200nm corresponding to Tm3+: 3F4→3H6 and Ho3+: 5I7→5I8 transitions. The energy transfer from Tm3+ to Ho3+ ions results in a strong 2030nm emission. Results demonstrate that the emission intensity of the sample containing Ag NPs is much higher than that of the sample without Ag addition. For the best AgTH6 sample, the absorption and emission cross sections of Ho3+ transition (5I8→5I7) reach 0.5×10−20cm2 at 1945nm and 0.78×10−20cm2 at 2030nm, respectively. The comparative performances, i.e., σe×full width at half maximum and σe×τ, are approximately 129×10−20cm2nm and 24.8×10−24cm2s, respectively. Therefore, the glass has a potential application as 2.0μm laser active media.
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