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具有接近变换极限的窄线宽的石墨烯调Q分布反馈光纤激光器。

Graphene Q-switched distributed feedback fiber lasers with narrow linewidth approaching the transform limit.

作者信息

Yao B C, Rao Y J, Huang S W, Wu Y, Feng Z Y, Choi C, Liu H, Qi H F, Duan X F, Peng G D, Wong C W

出版信息

Opt Express. 2017 Apr 3;25(7):8202-8211. doi: 10.1364/OE.25.008202.

Abstract

A compact all-in-line graphene-based distributed feedback Bragg-grating fiber laser (GDFB-FL) with narrow linewidth of hundreds kHz is demonstrated and investigated in this study. Performing as an optical saturable absorber, graphene oscillates the initially kHz linewidth DFB-FL, and generates high-quality passively Q-switched pulses. Pumped with a 980 nm continuous-wave laser, the Q-switched GDFB-FL observes ~1 μs pulse durations, with pulse energies up to ~10 nJ and approaching the transform limit. The peak power is ~600 times higher than the original DFB-FL laser. By optimizing the cavity design and the graphene material, it is predicted that fast Q-switched pulses with more than MHz repetition rates and sub-100 ns pulse durations are achievable. Such transform-limited Q-switched GDFB-FLs with narrow linewidth of sub-MHz have long coherence length, good tunability, stability, compactness and robustness, with potential impact in optical coherent communications, metrology and sensing.

摘要

本研究展示并研究了一种紧凑的全在线石墨烯基分布反馈布拉格光栅光纤激光器(GDFB-FL),其线宽窄至数百千赫兹。作为一种光学饱和吸收体,石墨烯使初始线宽为千赫兹的分布反馈光纤激光器产生振荡,并产生高质量的被动调Q脉冲。用980nm连续波激光器泵浦时,调Q的GDFB-FL观察到脉冲持续时间约为1μs,脉冲能量高达约10nJ,且接近变换极限。峰值功率比原始分布反馈光纤激光器高出约600倍。通过优化腔设计和石墨烯材料,预计可实现重复频率超过兆赫兹且脉冲持续时间低于100纳秒的快速调Q脉冲。这种具有亚兆赫兹窄线宽的变换极限调Q GDFB-FL具有长相干长度、良好的可调谐性、稳定性、紧凑性和鲁棒性,在光相干通信、计量学和传感领域具有潜在影响。

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