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Opt Express. 2011 Mar 28;19(7):6514-23. doi: 10.1364/OE.19.006514.

Superbroadband near-infrared emission in Tm-Bi codoped sodium-germanium-gallate glasses.

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Department of Electronic Engineering, City University of Hong Kong, Kowloon, Hong Kong, China.


Superbroadband emission from 1.0 to 1.7 μm wavelength was observed in thulium-bismuth (Tm-Bi) codoped sodium-germanium-gallate (NGG) glasses under 793 nm excitation. Efficient energy transfer process from Bi to Tm ions, with value as high as 67.7%, was achieved which is beneficial in achieving flat broadband lineshape. The large stimulated emission cross-section and measured lifetime confirm the potentials of Tm-Bi codopants as luminescence sources for superbroadband near-infrared (NIR) optical amplifiers and tunable lasers. Planar optical waveguides were fabricated successfully in the codoped NGG glasses using K(+)-Na(+) ion-exchange process.

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