Highly Tm 3+ doped germanate glass and its single mode fiber for 2.0 I 1/4m laser

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Abstract

Highly Tm 3+ doped optical fibers are urgently desirable for 2.0 I 1/4m compact single-frequency fiber laser and high-repetition-rate mode-locked fiber laser. Here, we systematically investigated the optical parameters, energy transfer processes and thermal properties of Tm 3+ doped barium gallo-germanate (BGG) glasses. Highly Tm 3+ doped BGG glass single mode (SM) fibers were fabricated by the rod-in-tube technique. The Tm 3+ doping concentration reaches 7.6 × 10 20 ions/cm 3, being the reported highest level in Tm 3+ doped BGG SM fibers. Using ultra short (1.6 cm) as-drawn highly Tm 3+ doped BGG SM fiber, a single-frequency fiber laser at 1.95 I 1/4m has been demonstrated with a maximum output power of 35 mW when in-band pumped by a home-made 1568 nm fiber laser. Additionally, a multilongitudinal-mode fiber laser at 1.95 I 1/4m has also been achieved in a 10 cm long as-drawn active fiber, yielding a maximum laser output power of 165 mW and a slope efficiency of 17%. The results confirm that the as-drawn highly Tm 3+ doped BGG SM fibers are promising in applications that require high gain and high power from a short piece of active optical fiber.

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Wen, X., Tang, G., Yang, Q., Chen, X., Qian, Q., Zhang, Q., & Yang, Z. (2016). Highly Tm 3+ doped germanate glass and its single mode fiber for 2.0 I 1/4m laser. Scientific Reports, 6. https://doi.org/10.1038/srep20344

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