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 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.
© 2012 Chinese Optics Letters
Guoying Zhao, Ying Tian, Huiyan Fan, Junjie Zhang, and Lili Hu, "Efficient 2.7-μm emission in Er3+-doped bismuth germanate glass pumped by 980-nm laser diode," Chin. Opt. Lett. 10, 091601-091601 (2012)