Abstract
-doped and -codoped multicomponent germanium tellurite (MGT) glasses with multifarious emission channels in the near-infrared wavelength region have been fabricated and characterized. Judd–Ofelt intensity parameters of -doped MGT glasses are solved to be , , and , indicating a higher asymmetric and stronger covalent environment around ions in MGT glasses. Efficient infrared fluorescences have been observed in MGT glasses, and spontaneous emission probabilities are derived to be 230.4, 79.9, and for the , , and radiative transitions, respectively. In -codoped MGT glasses, the maximum stimulated emission cross-section of 2.0 μm emission is calculated to be , and the corresponding gain cross-section is derived to be when the excited state population fraction reaches 0.8. Multifarious infrared emissions show that in MGT glasses is a good candidate for optical amplifiers and optoelectronic devices.
© 2015 Optical Society of America
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