Qian Guoquan, Wang Wenlong, Tang Guowu, Guan Xianchao, Lin Wei, Qian Qi, Chen Dongdan, Yang Changsheng, Liu Jiantao, Zhou Guiyao, Xu Shanhui, Yang Zhongmin
Opt Lett. 2020 Mar 1;45(5):1047-1050. doi: 10.1364/OL.386005.
In this work, Tm:YAG (Tm:${{\rm Y}_3}{{\rm Al}5}{{\rm O}{12}}$YAlO) 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.
在这项工作中，采用熔芯法制备了Tm:YAG（Tm:Y₃Al₅O₁₂，钇铝石榴石）陶瓷衍生的多材料光纤，该光纤在1950 nm处具有2.7 dB/cm的高单位长度增益。据我们所知，这是类似的Tm:YAG衍生多材料光纤在2 µm波段的最高单位长度增益。基于一根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。所实现的1950 nm激光器，其最大输出功率约为240 mW，斜率效率为16.5%，由自行研制的1610 nm光纤激光器泵浦。此外，还实现了基于该10厘米长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处工作，脉宽约为380 ps，重复频率为26.45 MHz。这里描述的结果表明，具有高单位长度增益的Tm:YAG陶瓷衍生多材料光纤在2 µm全光纤激光器中具有广阔的应用前景。
