High output mode-locked laser empowered by defect regulation in 2D Bi(2)O(2)Se saturable absorber.
High output mode-locked laser empowered by defect regulation in 2D Bi(2)O(2)Se saturable absorber.
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二维 Bi2O2Se 可饱和吸收体缺陷调节增强高输出锁模激光器
DOI：
10.1038/s41467-022-31606-8
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发表时间：
2022-07-05
影响因子：
16.6
通讯作者：
Ni, Zhenhua
中科院分区：
文献类型：
--
作者：
Liu, Junting;Yang, Fang;Lu, Junpeng;Ye, Shuai;Guo, Haowen;Nie, Hongkun;Zhang, Jialin;He, Jingliang;Zhang, Baitao;Ni, Zhenhua
原子薄的Bi2O2Se是一种新型的二维材料，具有超宽带非线性光学响应、高载流子迁移率和优异的空气稳定性，在光调制器的实现方面显示出巨大的潜力。在这里，我们展示了一个飞秒固体激光器在1.0微米的Bi2O2Se纳米片作为可饱和吸收体（SA）。进一步对2D Bi2O2Se进行缺陷调控后，锁模激光器的平均功率从421 mW提高到665 mW，脉宽从587 fs减小到266 fs。适度的Ar+等离子体处理，精确地调节在Bi2O2Se纳米片中的O和Se缺陷状态。非简并泵浦-探测测量表明，缺陷工程有效地加快了光生载流子的捕获率和缺陷辅助俄歇复合率。在优化缺陷调节后，饱和强度从3.6 ± 0.2提高到12.8 ± 0.6 MW cm − 2。增强的可饱和吸收和超快的载流子寿命使高性能锁模激光器具有大的输出功率和短的脉冲宽度。Bi_2O_2Se具有宽带非线性响应、空气稳定性和载流子迁移率等优点，有望成为二维光调制器的理想材料。在这里，作者报告了实现缺陷工程Bi2O2Se纳米片作为飞秒固态激光器的可饱和吸收体，显示出改善的输出功率和脉冲持续时间。
Atomically thin Bi2O2Se has emerged as a novel two-dimensional (2D) material with an ultrabroadband nonlinear optical response, high carrier mobility and excellent air stability, showing great potential for the realization of optical modulators. Here, we demonstrate a femtosecond solid-state laser at 1.0 µm with Bi2O2Se nanoplates as a saturable absorber (SA). Upon further defect regulation in 2D Bi2O2Se, the average power of the mode-locked laser is improved from 421 mW to 665 mW, while the pulse width is decreased from 587 fs to 266 fs. Moderate Ar+ plasma treatments are employed to precisely regulate the O and Se defect states in Bi2O2Se nanoplates. Nondegenerate pump-probe measurements show that defect engineering effectively accelerates the trapping rate and defect-assisted Auger recombination rate of photocarriers. The saturation intensity is improved from 3.6 ± 0.2 to 12.8 ± 0.6 MW cm−2 after the optimized defect regulation. The enhanced saturable absorption and ultrafast carrier lifetime endow the high-performance mode-locked laser with both large output power and short pulse duration. Bi2O2Se holds potential for the realization of 2D optical modulators due to its broadband nonlinear response, air stability and carrier mobility. Here, the authors report the realization of defect-engineered Bi2O2Se nanoplates as saturable absorbers for femtosecond solid-state lasers, showing improved output power and pulse duration.
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