Wang Fang, Zhou Hua, Li Nan, Liu Jiaxing, Li Daguang, Kang Zhe, Jia Zhixu, Qiao Zhen-An, Qin Weiping, Qin Guanshi
State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, State Key Laboratory of Inorganic Synthesis and Preparation Chemistry, College of Chemistry, Jilin University Changchun 130012 China
Changchun Observatory, National Astronomical Observatories, CAS Changchun 130117 China.
RSC Adv. 2019 Apr 15;9(21):11621-11626. doi: 10.1039/c9ra01082c. eCollection 2019 Apr 12.
We demonstrate nonlinear optical modulation by combining mesoporous carbon nanospheres (MCNs) and D-shaped fibers (DFs). The MCNs are prepared by the silica-assisted strategy and the DFs are fabricated through a precision wheel polishing method. When the MCNs are deposited onto the DF as the saturable absorbers (SAs), the SAs possess broadband linear absorption and nonlinear saturable absorption properties. As the DF-MCNs SA is integrated into the laser cavities, ultrafast lasers at 1.56 and 2 μm were realized with minimal pulse duration down to a few hundreds of femtoseconds. Compared with the film and microfiber-based MCNs-SAs, the DF-MCNs SAs exhibit greater robustness and stronger evanescent field, and are more effective at generating femtosecond pulses. Our results verify that DF-MCNs as a kind of cost-effective and easily-prepared SA would be of great importance for stable and high-power femtosecond fiber lasers.
我们通过将介孔碳纳米球（MCNs）与D形光纤（DFs）相结合来演示非线性光学调制。MCNs采用二氧化硅辅助策略制备，DFs通过精密轮抛光方法制造。当MCNs作为可饱和吸收体（SAs）沉积在DF上时，这些SAs具有宽带线性吸收和非线性可饱和吸收特性。随着DF-MCNs SA被集成到激光腔中，实现了1.56μm和2μm的超快激光，其最小脉冲持续时间低至几百飞秒。与基于薄膜和微光纤的MCNs-SAs相比，DF-MCNs SAs表现出更高的鲁棒性和更强的倏逝场，并且在产生飞秒脉冲方面更有效。我们的结果证实，DF-MCNs作为一种经济高效且易于制备的SA，对于稳定且高功率的飞秒光纤激光器具有重要意义。
