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Heavily Tm3+-Doped Silicate Fiber for High-Gain Fiber Amplifiers

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Author(s): Yin-Wen Lee | Han-Wei Chien | Che-Hung Cho | Ju-Zhe Chen | Juin-Shin Chang | Shibin Jiang

Journal: Fibers
ISSN 2079-6439

Volume: 1;
Issue: 3;
Start page: 82;
Date: 2013;
Original page

Keywords: Thulium | silicate fiber | fiber laser | fiber amplifiers

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.
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