Optical nonlinearity engineering of a bismuth telluride saturable absorber and application of a pulsed solid state laser therein.
Optical nonlinearity engineering of a bismuth telluride saturable absorber and application of a pulsed solid state laser therein.
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DOI：
10.1039/c7nr06004a
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发表时间：
2017-12
期刊：
影响因子：
6.7
通讯作者：
Yiran Wang;P. Lee;Baitao Zhang;Y. Sang;Jingliang He;Hong Liu;Chao-Kuei Lee
中科院分区：
文献类型：
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作者：
Yiran Wang;P. Lee;Baitao Zhang;Y. Sang;Jingliang He;Hong Liu;Chao-Kuei Lee
可饱和吸收体（SA）在实现各种波长的光纤和固体激光器的脉冲激光器中有着有趣的应用。拓扑绝缘体（TI）最近被发现具有饱和吸收，由于其独特的能带结构。在这项研究中，高纯度的Bi2Te3薄膜SA层已成功地制备使用旋涂共还原方法（SCCA）。与传统的拓扑绝缘体可饱和吸收体制备方法相比，SCCA可以制备出高光学质量、大面积一致性、厚度可控的拓扑绝缘体可饱和吸收体（TISA），这对脉冲激光器的发展至关重要。据我们所知，这项研究是第一次观察和讨论明确的厚度依赖的光学非线性。在这项研究中，Q开关体Nd：YAG激光器的演示和研究使用制备的TISA作为吸收体。稳定的脉冲激光的时间抖动和幅度波动表明，SCCA适合于制备Bi2Te3 SA。此外，SCCA能够通过饱和强度工程建立脉冲激光。
Saturable absorbers (SAs) have interesting applications for the realization of pulsed lasers in various wavelengths of fiber and solid-state lasers. Topological insulators (TIs) have been recently discovered to feature saturable absorption due to their unique band structure. In this study, high-purity layers of Bi2Te3 thin film SA have been successfully prepared using the spin coating-coreduction approach (SCCA). Compared with the typical method of preparing SAs, the SCCA can be used to prepare topological insulator saturable absorbers (TISAs) with high optical quality, large area consistency, and controllable thickness, which is critical for pulsed lasers. To the best of our knowledge, this study is the first observation and discussion of clear thickness-dependent optical nonlinearity. In this study, a Q-switched bulk Nd:YAG laser is demonstrated and investigated using the prepared TISA as the absorber. The timing jitter and amplitude fluctuation of the stable pulse laser indicated that the SCCA is suitable for fabricating a Bi2Te3 SA. Furthermore, the SCCA enables the establishment of a pulsing laser through saturation intensity engineering.