Abstract

${\mathrm{Ho}}^{3+}$-doped and ${\mathrm{Ho}}^{3+}/{\mathrm{Yb}}^{3+}$-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 ${\mathrm{Ho}}^{3+}$-doped MGT glasses are solved to be ${\mathrm{\Omega }}_2=5.32\times {10}^{-20}{\mathrm{cm}}^2$, ${\mathrm{\Omega }}_4=2.73\times {10}^{-20}{\mathrm{cm}}^2$, and ${\mathrm{\Omega }}_6=1.12\times {10}^{-20}{\mathrm{cm}}^2$, indicating a higher asymmetric and stronger covalent environment around ${\mathrm{Ho}}^{3+}$ 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 $138.3{\mathrm{s}}^{-1}$ for the ${}^5{\mathrm{I}}_6\to {}^5{\mathrm{I}}_8$, $({}^5{\mathrm{F}}_4,{{}^5\mathrm{S}}_2)\to {}^5{\mathrm{I}}_5$, and ${}^5{\mathrm{I}}_7\to {}^5{\mathrm{I}}_8$ radiative transitions, respectively. In ${\mathrm{Ho}}^{3+}/{\mathrm{Yb}}^{3+}$-codoped MGT glasses, the maximum stimulated emission cross-section of 2.0 μm emission is calculated to be $4.93\times {10}^{-21}{\mathrm{cm}}^2$, and the corresponding gain cross-section is derived to be $3.62\times {10}^{-21}{\mathrm{cm}}^2$ when the excited state population fraction $P$ reaches 0.8. Multifarious infrared emissions show that ${\mathrm{Ho}}^{3+}$ in MGT glasses is a good candidate for optical amplifiers and optoelectronic devices.

© 2015 Optical Society of America

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