Ef f icient 2.7 \mu m emission in Er3+ doped bismuth germanate glass pumped by 9

An Er3+-doped lead-free bismuth germanate glass is synthesized. Its 2.7-\mu m emission property is analyzed, and the efficient 2.7-\mu m emission from the glass is observed under 980-nm laser diode excitation. The prepared glass possesses high spontaneous transition probability (64.8 s?1) and a larg