Abstract: We report on investigation the potential of a 7 wt% (8.35 × 1020 Tm3+/cm3) doped silicate fibers for high-gain fiber amplifiers. Such a high ion concentration significantly reduces the required fiber length of high-power 2 μm fiber laser systems and allows the high-repetition rate operation in 2 μm mode-locked fiber lasers. To evaluate the feasibility of extracting high gain-per-unit-length from this gain medium, we measure several key material properties of the silicate fiber, including the absorption/emission cross-sections, upper-state lifetime, fiber background loss, and photodarkening resistance. We show through numerical simulations that a signal gain-per-unit-length of 3.78 dB/cm at 1950 nm can be achieved in a watt-level core-pumped Tm3+-doped silicate fiber amplifier. In addition, an 18-dB 2013-nm amplifier is demonstrated in a 50-cm 7 wt% Tm3+-doped double-clad silicate fiber. Finally, we experimentally confirm that the reported silicate host exhibits no observable photodarkening.
Keywords: Thulium; silicate fiber; fiber laser; fiber amplifiers
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Lee, Y.-W.; Chien, H.-W.; Cho, C.-H.; Chen, J.-Z.; Chang, J.-S.; Jiang, S. Heavily Tm3+-Doped Silicate Fiber for High-Gain Fiber Amplifiers. Fibers 2013, 1, 82-92.
Lee Y-W, Chien H-W, Cho C-H, Chen J-Z, Chang J-S, Jiang S. Heavily Tm3+-Doped Silicate Fiber for High-Gain Fiber Amplifiers. Fibers. 2013; 1(3):82-92.
Lee, Yin-Wen; Chien, Han-Wei; Cho, Che-Hung; Chen, Ju-Zhe; Chang, Juin-Shin; Jiang, Shibin. 2013. "Heavily Tm3+-Doped Silicate Fiber for High-Gain Fiber Amplifiers." Fibers 1, no. 3: 82-92.