Article

Superbroadband Near-Infrared Emission in Tm-Bi Codoped Sodium-Germanium-Gallate Glasses

Department of Electronic Engineering, City University of Hong Kong, Kowloon, Hong Kong, China.
Optics Express (Impact Factor: 3.49). 03/2011; 19(7):6514-23. DOI: 10.1364/OE.19.006514
Source: PubMed

ABSTRACT

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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    • "Investigations were carried out mainly on the glasses co-doped by Bi+Yb [12] [13] [14] [15], Bi+Er [16] [17] [18], and Bi+Tm [19] [20]. But we consider the research in this area to be beyond the scope of this review. "
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