Abstract

Tm3+ -doped acid-resistant aluminum germanate (NMAG) glasses and a K+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 0.48dBcm at 1.482μm wavelength was achieved in the 3.15cm long channel waveguide. Based on absorption and emission cross-sections, the ideal internal gain coefficient at 1.675μm and 1.815μm is given to be 0.5dBcm and 2.0dBcm, respectively, as the population inversion equals 1.0. Experimental results and theoretical anticipation indicate that Tm3+ -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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