Abstract
An Er<sup>3+</sup>-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<sup>-1</sup>) and a
large calculated emission cross section (6.61 × 10<sup>-21</sup> cm<sup>2</sup>) corresponding
to the <sup>4</sup>I<sub>11/2</sub> -> <sup>4</sup>I<sub>13/2</sub> transition. The multiphonon relaxation rate for the
excited state <sup>4</sup>I<sub>11/2</sub> is only 236 s<sup>-1</sup>. 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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