| 皮秒光纤激光脉冲两个关键问题的研究 |
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| 引用本文： | 路桥,毛庆和.皮秒光纤激光脉冲两个关键问题的研究[J].强激光与粒子束,2020,32(12):121005-1-121005-15. |
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| 作者姓名： | 路桥 毛庆和 |
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| 作者单位： | 中国科学院 合肥物质科学研究院 安徽光学与精密机械研究所,合肥 230026;中国科学院 合肥物质科学研究院 安徽光学与精密机械研究所,合肥 230026;中国科学技术大学,环境科学与光电技术学院,合肥 230026 |
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| 基金项目： | 国家重点研发计划项目（2017YFB0405100，2017 YFB0405200）；中国科学院战略性先导科技专项B类（XDB21010300）；国家自然科学基金项目（61805258，61377044）；先进激光技术安徽省实验室主任基金项目（20191001） |
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| 摘 要： | 窄带耗散孤子锁模光纤激光器可以产生接近变换限制的皮秒脉冲，但受非线性相移的限制，输出脉冲重复频率不能通过增加腔长来降低，脉冲能量仅在0.1 nJ以下，严重制约着这类皮秒脉冲的实际应用。提出一种通过耦合器抽取腔内脉冲能量、抑制腔内非线性相移积累，进而允许增加腔长来降低窄带耗散孤子皮秒光纤激光脉冲重复频率的方法。运用该方法，成功地将激光器重复频率由35.2 MHz降低到了1.77 MHz，且脉冲时频特性保持不变。提出了一种基于级间FBG陷波滤波的抑制皮秒脉冲光纤放大中光谱展宽的方法。通过简单地使用级间陷波滤波器，既可窄化第一级光纤放大器后的输出脉冲谱宽，允许采用第二级光纤放大器进一步提升脉冲能量，而且，还可将脉冲重塑为近高斯形，利用高斯脉冲光谱展宽斜率小的特点，允许第二级光纤放大器将脉冲能量提升得更高。利用该方法，在RMS（均方值）谱宽保持0.4 nm以内的前提下，10 ps脉冲经标准单模光纤放大器后，能量可由0.2 nJ可提升到10 nJ以上。
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| 关 键 词： | 皮秒脉冲 锁模光纤激光器 皮秒光纤放大器 重复频率 脉冲能量 非线性相移 |
| 收稿时间： | 2020-07-20 |
Two key frontier issues on picosecond pulses generated by mode-locked fiber lasers |
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| Affiliation: | 1.Anhui Provincial Key Laboratory of Photonics Devices and Materials, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 2300262.School of Environmental Science and Optoelectronic Technology,University of Science and Technology of China, Hefei 230026 |
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| Abstract: | Narrowband dissipative soliton mode-locked fiber lasers can produce transform-limited picosecond pulses. Unfortunately, due to the limitation of allowable nonlinear phase shift for the intracavity pulse, the repetition rate of the pulses generated by such lasers cannot be reduced by increasing the cavity length; the pulse energy is only below 0.1 nJ. These seriously restrict the practical application of such picosecond pulsed fiber lasers. In this paper, we propose a method that allows the cavity length to be increased to reduce the repetition rate of the narrowband dissipative soliton picosecond fiber laser pulses by extracting the pulse energy out of the cavity with a coupler to suppress the accumulation of nonlinear phase shift of the intracavity pulses. Using this method, the laser repetition rate was successfully reduced from 35.2 MHz to 1.77 MHz, and the pulse time-frequency characteristics remained unchanged. We also propose a method to suppress spectral broadening in picosecond pulse fiber amplification based on inter-stage FBG notch filtering. By simply using the inter-stage notch filter, the output pulse spectrum width after the first-stage fiber amplifier can be narrowed, allowing the second-stage fiber amplifier to further increase the pulse energy, and also, the pulse can be reshaped to be nearly Gaussian-shaped, allowing the second-stage fiber amplifier to increase the pulse energy higher by using the Gaussian pulse characteristics of the smaller spectral broadening slope. Using this method, on the premise of keeping the RMS spectral width within 0.4 nm, after a 10 ps pulse passes through a standard single-mode fiber amplifier, the pulse energy can be increased from 0.2 nJ to more than 10 nJ. |
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