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• 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