Abstract

${\mathrm{Tm}}^{3+}$ -doped acid-resistant aluminum germanate (NMAG) glasses and a ${\mathrm{K}}^{+}–{\mathrm{Na}}^{+}$ ion-exchanged channel waveguide have been fabricated and characterized. Judd–Ofelt intensity parameters indicate a high asymmetry and strong covalent environment in NMAG glasses. A remarkable internal gain coefficient of $0.48\mathrm{dB}∕\mathrm{cm}$ at $1.482\mu \mathrm{m}$ wavelength was achieved in the $3.15\mathrm{cm}$ long channel waveguide. Based on absorption and emission cross-sections, the ideal internal gain coefficient at $1.675\mu \mathrm{m}$ and $1.815\mu \mathrm{m}$ is given to be $0.5\mathrm{dB}∕\mathrm{cm}$ and $2.0\mathrm{dB}∕\mathrm{cm}$, respectively, as the population inversion equals 1.0. Experimental results and theoretical anticipation indicate that ${\mathrm{Tm}}^{3+}$ -doped NMAG glasses are potential and attractive substrates in developing S- and U-band waveguide amplifiers and an eye-safe medical laser.

© 2010 Optical Society of America

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