In this work, Tm:YAG (Tm:${{\rm Y}_3}{{\rm Al}_5}{{\rm O}_{12}}$Y3Al5O12) ceramic-derived multimaterial fiber was fabricated by using the molten core method, which has a high gain per unit length of 2.7 dB/cm at 1950 nm. To our knowledge, this is the highest gain per unit length at 2 µm band in similar Tm:YAG-derived multimaterial fibers. A distributed Bragg reflector (DBR) fiber laser was built based on a 10-cm-long as-drawn fiber. The achieved 1950 nm laser, which has a maximum output power of $\sim{240}\;{\rm mW}$∼240mW and a slope efficiency of 16.5%, was pumped by a self-developed 1610 nm fiber laser. What is more, an all-fiber-integrated passively mode-locked fiber laser based on the 10-cm-long as-drawn fiber was realized. The mode-locked pulses operate at 1950 nm with duration of $\sim{380}\;{\rm ps}$∼380ps, and the repetition rate is 26.45 MHz. The results described here indicate that the Tm:YAG ceramic-derived multimaterial fiber with high gain per unit length has promising applications in 2 µm all-fiber fiber lasers.

中文翻译：

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Tm：YAG陶瓷衍生的多材料光纤，在2 µm激光应用中单位长度具有高增益。

在这项工作中，Tm：YAG（Tm：$ {{\ rm Y} _3} {{\ rm Al} _5} {{\ rm O} _ {12}} $ Y3Al5O12）陶瓷是通过使用熔融核法，在1950 nm处每单位长度的增益很高，为2.7 dB / cm。据我们所知，这是在类似的Tm：YAG衍生的多材料纤维中，在2 µm波段处单位长度上的最高增益。基于10厘米长的拉制光纤构建了分布式布拉格反射器（DBR）光纤激光器。自行开发的1610 nm光纤激光器泵浦了获得的1950 nm激光器，其最大输出功率为$ 240 mW，最大输出功率为240 mW，斜率效率为16.5％。而且，实现了基于10cm长的拉制光纤的全光纤集成被动锁模光纤激光器。锁模脉冲在1950 nm处操作，持续时间为\\ sim {380} \; {\ rm ps} $〜380ps，重复率为26。45 MHz。此处描述的结果表明，具有高单位长度增益的Tm：YAG陶瓷多材料光纤在2 µm全光纤光纤激光器中具有广阔的应用前景。