Abstract
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 large calculated emission cross section (6.61 \times 10^{?21} cm2) corresponding to the 4I11/2 -> 4I13/2 transition. The multiphonon relaxation rate for the excited state 4I11/2 is only 236 s?1. Therefore, the excellent spectroscopic properties and outstanding thermal stability suggest that this glass is a suitable host for developing solid-state lasers operating in the mid-infrared.
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