Vector Passive Harmonic Mode-locking Fiber Laser Based on Topological Insulator Bi2Se3 Interacting with Fiber Taper

Q Physics and Astronomy
Jian Li
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引用次数: 6

Abstract

I propose a vector passive harmonic mode-locked fiber laser based on topological insulator Bi2Se3 interacting with a fiber taper with a diameter of 7 μm. The particles of topological insulator are deposited uniformly onto the fiber taper with light pressure effect. By incorporating the fabricated saturable absorber into an Er-doped fiber laser cavity, stable mode-locked fiber is obtained. Due to the intense evanescent field of the fiber taper, strong confinement of light enhances the nonlinearity of the laser cavity, and passive harmonic mode-locking is performed. I observe a maximum harmonic mode-locking of 356th, corresponding to a frequency of 3.57 GHz. The pulse duration is 824 fs, and the full width at half maximum of the spectrum is about 8.2 nm. The polarization dependent loss of the saturable absorber is ~ 2.5 dB in the wavelength range of the C band. As the cavity contains no other polarization dependent device, the mode-locked laser is functioning in the vector state. The harmonic order vs pump power is investigated. To the best of our knowledge, this report is the highest frequency mode-locked fiber laser based on Bi2Se3. Experimental results indicate that the topological insulator Bi2Se3 functioning with a thin fiber taper is effective for vector harmonic mode-locking.
基于拓扑绝缘体Bi2Se3与光纤锥度相互作用的矢量无源谐波锁模光纤激光器
本文提出了一种基于拓扑绝缘体Bi2Se3与直径为7 μm的光纤锥度相互作用的矢量无源谐波锁模光纤激光器。在光压效应下,拓扑绝缘子粒子均匀地沉积在光纤锥上。将所制备的可饱和吸收体掺入掺铒光纤激光腔中,获得了稳定的锁模光纤。由于光纤锥度的强倏逝场,光的强约束增强了激光腔的非线性,实现了无源谐波锁模。我观察到最大谐波锁模为356,对应于3.57 GHz的频率。脉冲持续时间为824 fs,半峰全宽约为8.2 nm。在C波段的波长范围内,可饱和吸收体的极化相关损耗为~ 2.5 dB。由于腔内不含其他依赖偏振的器件,锁模激光器工作在矢量态。研究了谐波阶与泵功率的关系。据我们所知,本报告是基于Bi2Se3的最高频率锁模光纤激光器。实验结果表明,具有细光纤锥度的拓扑绝缘子Bi2Se3可以有效地实现矢量谐波锁模。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
0.70
自引率
0.00%
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0
审稿时长
2.3 months
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