Abstract

An Er³⁺-doped lead-free bismuth germanate glass is synthesized. Its 2.7-μm emission property is analyzed, and the efficient 2.7-μm 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 × 10^-21 cm²) corresponding to the ⁴I_11/2 -> ⁴I_13/2 transition. The multiphonon relaxation rate for the excited state ⁴I_11/2 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.

© 2012 Chinese Optics Letters

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