Dou Zhiyuan, Song Yanrong, Tian Jinrong, Liu Jinghui, Yu Zhenhua, Fang Xiaohui
Opt Express. 2014 Oct 6;22(20):24055-61. doi: 10.1364/OE.22.024055.
We demonstrated an all-normal-dispersion Yb-doped mode-locked fiber laser based on Bi₂Se₃ topological insulator (TI). Different from previous TI-mode-locked fiber lasers in which TIs were mixed with film-forming agent, we used a special way to paste a well-proportioned pure TI on a fiber end-facet. In this way, the effect of the film-forming agent could be removed, thus the heat deposition was relieved and damage threshold could be improved. The modulation depth of the Bi₂Se₃ film was measured to be 5.2%. When we used the Bi₂Se₃ film in the Yb-doped fiber laser, the mode locked pulses with pulse energy of 0.756 nJ, pulse width of 46 ps and the repetition rate of 44.6 MHz were obtained. The maximum average output power was 33.7 mW. When the pump power exceeded 270 mW, the laser can operate in multiple pulse state that six-pulse regime can be realized. This contribution indicates that Bi₂Se₃ has an attractive optoelectronic property at 1μm waveband.
我们展示了一种基于Bi₂Se₃拓扑绝缘体（TI）的全正色散掺镱锁模光纤激光器。与之前将拓扑绝缘体与成膜剂混合的拓扑绝缘体锁模光纤激光器不同，我们采用了一种特殊的方法将比例恰当的纯拓扑绝缘体粘贴在光纤端面上。通过这种方式，可以消除成膜剂的影响，从而减轻热沉积并提高损伤阈值。测得Bi₂Se₃薄膜的调制深度为5.2%。当我们在掺镱光纤激光器中使用Bi₂Se₃薄膜时，获得了脉冲能量为0.756 nJ、脉冲宽度为46 ps且重复频率为44.6 MHz的锁模脉冲。最大平均输出功率为33.7 mW。当泵浦功率超过270 mW时，激光器可以在多脉冲状态下工作，能够实现六脉冲状态。这一成果表明Bi₂Se₃在1μm波段具有诱人的光电特性。
