Abstract
We propose and demonstrate potassium bismuth gallate (KBG) glasses as suitable hosts for the rare-earth ion (thulium) operating at the 1.47-µm wavelength. The optical properties of -doped KBG glasses were investigated. The bandwidth of the transition is ∼120 nm and is higher than that of -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 -codoped KBG glasses was also investigated, and these results indicate that -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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