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掺镱锁模光纤激光器中干涉梳状滤波器的滤波动力学

Filtering dynamics of an interference comb filter in a ytterbium-doped mode-locked fiber laser.

作者信息

Xu Hailong, Zhang Liqiang, Yao Yicun, Wang Minghong, Liu Yuanzhen, Li Xiangdong, Li Jiaxin, Nie Zhaogang, Li Xiaohui

机构信息

School of Physics Sciences and Information Technology, Liaocheng University, Liaocheng, 252000, China.

School of Physics and Information Technology, Shaanxi Normal University, Xi'an, 710000, China.

出版信息

Sci Rep. 2025 Apr 2;15(1):11286. doi: 10.1038/s41598-025-95102-x.

DOI:10.1038/s41598-025-95102-x
PMID:40175485
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11965344/
Abstract

Filter plays a key role in a positive dispersion Yb-doped mode-locked fiber laser. It works together with saturable absorbers to maintain the self-consistent evolution of the pulses. Fiber interference filter has a compact structure and is easy to implement. However, its comb-shaped transmission spectrum introduces sidebands at the edges of the pulse spectrum. A numerical model of mode-locked fiber laser using an interference filter is established based on the coupled Ginzburg-Landau equations. The reasons for the appearance of sidebands are analyzed, and the impact of the sidebands on the pulse characteristics is discussed. The simulation results show that the spectral sidebands originate from the comb-shaped transmission spectrum of the interference filter. When the transmittance of the neighboring peaks of the comb filter decreases by 20 dB, the spectral sidebands nearly disappear. The simulation results also indicate that a clear pedestal appears on both sides of the pulse, which occupies a portion of the pulse energy and reduces the pulse peak power by 3%. A method to eliminate the sidebands is proposed, which involves cascading filters with different free spectral ranges, to eliminate the influence of the neighboring transmission peaks of the filter. In the experiment, a filter based on cascaded tapered seven-core fiber is prepared and inserted into a Yb-doped fiber laser mode-locked by nonlinear polarization rotation. Stable mode-locked pulses have been obtained, with a pulse duration and energy of 4.37 ps and 1.2 nJ, respectively. The experimental results agree with the simulation results very well.

摘要

滤波器在正色散掺镱锁模光纤激光器中起着关键作用。它与饱和吸收体协同工作，以维持脉冲的自洽演化。光纤干涉滤波器结构紧凑，易于实现。然而，其梳状传输光谱在脉冲光谱边缘引入了边带。基于耦合的金兹堡 - 朗道方程建立了使用干涉滤波器的锁模光纤激光器的数值模型。分析了边带出现的原因，并讨论了边带对脉冲特性的影响。仿真结果表明，光谱边带源于干涉滤波器的梳状传输光谱。当梳状滤波器相邻峰值的透过率降低20 dB时，光谱边带几乎消失。仿真结果还表明，脉冲两侧出现明显的基座，其占据了一部分脉冲能量，使脉冲峰值功率降低了3%。提出了一种消除边带的方法，该方法涉及级联具有不同自由光谱范围的滤波器，以消除滤波器相邻传输峰值的影响。在实验中，制备了基于级联锥形七芯光纤的滤波器，并将其插入通过非线性偏振旋转锁模的掺镱光纤激光器中。获得了稳定的锁模脉冲，脉冲持续时间和能量分别为4.37 ps和1.2 nJ。实验结果与仿真结果非常吻合。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ee8c/11965344/da1ab4bc5e67/41598_2025_95102_Fig11_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ee8c/11965344/9db2ad112b45/41598_2025_95102_Fig1_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ee8c/11965344/0d40b9b2016e/41598_2025_95102_Fig7_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ee8c/11965344/da1ab4bc5e67/41598_2025_95102_Fig11_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ee8c/11965344/9db2ad112b45/41598_2025_95102_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ee8c/11965344/65b48e810b58/41598_2025_95102_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ee8c/11965344/6c3d95b7b2f5/41598_2025_95102_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ee8c/11965344/3fe5059e29b5/41598_2025_95102_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ee8c/11965344/80dd4fe4b1f5/41598_2025_95102_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ee8c/11965344/0eb6eafd08f2/41598_2025_95102_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ee8c/11965344/0d40b9b2016e/41598_2025_95102_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ee8c/11965344/e53ff8361652/41598_2025_95102_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ee8c/11965344/1f71c79906eb/41598_2025_95102_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ee8c/11965344/16f943d37832/41598_2025_95102_Fig10_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ee8c/11965344/da1ab4bc5e67/41598_2025_95102_Fig11_HTML.jpg

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Research Progress in Tunable Fiber Lasers Based on Multimode Interference Filters.基于多模干涉滤波器的可调谐光纤激光器研究进展
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