Drop-Casted Self-Assembled Topological Insulator Membrane as an Effective Saturable Absorber for Ultrafast Laser Photonics
Drop-Casted Self-Assembled Topological Insulator Membrane as an Effective Saturable Absorber for Ultrafast Laser Photonics
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DOI：
10.1109/jphot.2015.2406754
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发表时间：
2015-03
影响因子：
2.4
通讯作者：
Qingkai Wang;Yu Chen;Guobao Jiang;L. Miao;Chujun Zhao;Xiquan Fu;S. Wen;Han Zhang
中科院分区：
文献类型：
--
作者：
Qingkai Wang;Yu Chen;Guobao Jiang;L. Miao;Chujun Zhao;Xiquan Fu;S. Wen;Han Zhang
采用高性价比的溶剂热法，合成了具有均匀六边形纳米结构的超薄拓扑绝缘体碲化铋（Bi2Te3）纳米片。由于少层TI色散的均匀性，我们能够采用滴铸方法直接转移少层TI，从而形成自组装均匀的挥发性TI膜，适当地沉积在光纤的端面上，作为有效的光学可饱和吸收器。它的饱和吸收参数可以通过机械剥离来减薄它的厚度。由于不同的饱和吸收参数可以决定光纤激光器是工作在锁模状态还是q开关状态，因此在光纤激光腔内加入预制的可饱和吸收器可以实现微秒或飞秒脉冲的工作。我们的工作提供了一种方便的方法来制造高质量的基于TI膜的可饱和吸收体，在激光操作中具有很好的应用前景。
Through employing a cost-effective solvothermal method, ultrathin topological insulator (TI) bismuth telluride (Bi2Te3) nanosheets with uniform hexagonal nanostructures had been synthesized. Thanks to the uniformity of few-layer TI dispersion, we are able to adopt the drop-casting approach in order to directly transfer few-layer TI and, therefore, form a self-assembled uniform volatile TI membrane that is suitably deposited onto the end facet of an optical fiber as an effective optical saturable absorber. Its saturable absorption parameters could be deliberately tailored by thinning its thickness by mechanical exfoliation. The incorporation of the as-fabricated saturable absorber inside the fiber laser cavity allows for the operation of either a microsecond or a femtosecond pulse because different saturable absorption parameters can decide whether the fiber laser operates in the mode-locking or Q-switching state. Our work provides a convenient way of fabricating a high-quality TI membrane-based saturable absorber with promising applications for laser operation.