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1.47-µm emission and multiphonon relaxation of Tm3+ ions in potassium bismuth gallate glasses

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Abstract

We propose and demonstrate potassium bismuth gallate (KBG) glasses as suitable hosts for the rare-earth ion Tm3+ (thulium) operating at the 1.47-µm wavelength. The optical properties of Tm3+-doped KBG glasses were investigated. The bandwidth of the  3H4 3F4 transition is ∼120 nm and is higher than that of Tm3+-doped, tellurite-based glasses. The measured fluorescence lifetime is 0.15 ms at room temperature, and the quantum efficiency is 88%. Multiphonon relaxation rates for various transitions were evaluated and compared with other glass hosts. The energy transfer in Tm3+Ho3+-codoped KBG glasses was also investigated, and these results indicate that Tm3+-doped KBG glasses are promising candidates for efficient broadband optical amplifiers operating in the 1.47-µm wavelength range.

© 2004 Optical Society of America

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