• Chinese Optics Letters
  • Vol. 20, Issue 1, 010601 (2022)
Renyan Wang, Liang Jin*, Jiazhu Wang, Shangzhi Xie, Xiaohui Li, Yingtian Xu, He Zhang, Xin Zhao, and Xiaohui Ma
Author Affiliations
  • National Key Laboratory of High-power Semiconductor Lasers, Changchun University of Science and Technology, Changchun 130022, China
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    Abstract

    A novel harmonic mode-locked fiber laser based on nonlinear multimode interference (NL-MMI) in a microfiber-assisted ultrafast optical switch is proposed in this Letter. The microfiber-assisted ultrafast optical switch can be obtained by tapering the splicing point of the graded-index multimode fiber (GIMF) and single-mode fiber, which not only helps to shorten the self-imaging period in GIMF to relax the strict requirement of NL-MMI on the length of multimode fiber, but also improves the harmonic order. In the experiment, with the waist diameter of 15 µm, the repetition rates of the fiber laser can be stably locked at 285 MHz, corresponding to the 16th-order harmonic mode-locking, with the pulse duration of 1.52 ps. Our results provide novel insight into the design of a high-repetition-rate laser and the application of microfibers in the mode-locking device.
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    Renyan Wang, Liang Jin, Jiazhu Wang, Shangzhi Xie, Xiaohui Li, Yingtian Xu, He Zhang, Xin Zhao, Xiaohui Ma. Harmonic mode-locked fiber laser based on microfiber-assisted nonlinear multimode interference[J]. Chinese Optics Letters, 2022, 20(1): 010601
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    Category: Fiber Optics and Optical Communications
    Received: Jun. 9, 2021
    Accepted: Aug. 2, 2021
    Posted: Aug. 3, 2021
    Published Online: Oct. 12, 2021
    The Author Email: Liang Jin (jinliang@cust.edu.cn)