基于种子脉冲预整形的130 μJ线偏振单频12 μm纤芯铒镱共掺光纤激光器

蒋沛恒; 史朝督; 付士杰; 田浩; 盛泉; 史伟; 沈琪皓; 周鼎富; 姚建铨

doi:10.7498/aps.74.20241371

摘要

报道了基于种子脉冲预整形实现的百微焦1550 nm线偏振脉冲单频光纤激光器. 通过设计三角形脉冲种子波形, 优化其前沿上升趋势及低强度持续时间, 缓解脉冲激光在放大过程中因增益饱和效应引起的脉冲宽度压缩、激光峰值功率快速增长问题, 实现高能量脉冲单频激光放大. 实验中基于优化设计的脉冲种子波形, 在纤芯直径为12 μm的铒镱共掺光纤中, 实现了脉冲宽度608 ns、能量130 μJ、光谱线宽542 kHz的1550 nm线偏振脉冲单频激光输出.

关键词:

Abstract

Stimulated Brillouin scattering (SBS) is the major barrier in the process of energy scaling for pulsed single-frequency fiber master oscillator power amplifier (MOPA). Due to gain saturation effect, the laser pulse profile will be gradually distorted with the increase of pump power, which induces steep leading edge and narrower width for the amplified pulses. The resulting laser peak power would increase rapidly and thus the SBS threshold is reached earlier to limit the amplification of pulse energy.A method to obtain high-energy pulsed single-frequency laser by pulse pre-shaping is demonstrated in this work. By designing the leading edge of the triangular pulse, optimizing its rising trend and the duration of the low-intensity rising part, the pulse width compression phenomenon caused by gain saturation is alleviated effectively. Thereafter, the laser peak power increase process can be retarded to reach the SBS threshold so that higher energy can be amplified for the pulsed single-frequency fiber laser. In the experiment, when the seed pulse is optimized to be a triangular pulse with a low-intensity rising edge of 401 ns and a pulse width of 520 ns, a linear-polarized pulse single-frequency fiber laser of 130.9 μJ is obtained in a 12-μm-core Er/Yb co-doped polarization-maintaining fiber. The pulse width is broadened to 608 ns at the maximum energy. When it is compared with the triangular pulse seed with a rapidly rising leading edge, its maximum energy is increased by about 25%. The optical signal-to-noise ratio and polarization extinction ratio are measured to be 42 dB and 16 dB at the maximum pulse energy, respectively. The corresponding spectral linewidth measured by a delayed self-heterodyne system is 542 kHz. Higher pulse energy can be anticipated by further optimizing the pulse profile and using large-mode-are gain fibers.

Keywords:

作者及机构信息

1.
天津大学精密仪器与光电子工程学院, 天津　300072

2.
天津大学, 光电信息技术教育部重点实验室, 天津　300072

3.
西南技术物理研究所, 成都　610041

通信作者: 付士杰, shijie_fu@tju.edu.cn ; 史伟, shiwei@tju.edu.cn ;

基金项目: 国家自然科学基金(批准号: 62375201, 62275190, 62105240)、天津市自然科学基金(批准号: 23JCQNJC01740)、天津大学自主创新基金(批准号: 2023XPD-0020)、中国兵器工业集团有限公司激光器件技术重点实验室开放基金(批准号: QT23120019)、泰山产业领军人才项目(批准号: tscx202312163)和光电信息技术教育重点实验室(天津大学)开放基金(批准号: 2024KFKT007)资助的课题.

Authors and contacts

1.
School of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China

2.
Key Laboratory of Optoelectronic Information Technology (Ministry of Education), Tianjin University, Tianjin 300072, China

3.
Southwest Institute of Technical and Physics, Chengdu 610041, China

Corresponding author: FU Shijie, shijie_fu@tju.edu.cn ; SHI Wei, shiwei@tju.edu.cn ;

Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 62375201, 62275190, 62105240), the National Natural Science Foundation of Tianjin, China (Grant No. 23JCQNJC01740), the Seed Foundation of Tianjin University, China (Grant No. 2023XPD-0020), the Open Foundation of Key Laboratory of Laser Devices and Technology of China North Industries Group Co., LTD (Grant No. QT23120019), the Taishan Industry Leading Talent Project, China (Grant No. tscx202312163), and the Open Foundation of Key laboratory of Opto-electronic Information Technology, Ministry of Education (Tianjin University), China (Grant No. 2024KFKT007).

文章全文

参考文献

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施引文献

图 1 (a)—(c)不同上升趋势三角形种子脉冲(脉宽分别为732, 445, 215 ns)放大后波形特性仿真分析

Fig. 1. (a)–(c) Simulation analysis of the pulse shape characteristics of the three typical triangle seed pulses with different rising edge (pulse width are 732 , 445, 215 ns) during the amplification.

下载: 全尺寸图片幻灯片

图 2 1550 nm线偏振脉冲单频光纤激光MOPA光路示意图

Fig. 2. Schematic of the 1550 nm linear-polarized pulsed single-frequency fiber MOPA.

下载: 全尺寸图片幻灯片

图 3 经AOM调制产生的三种脉冲种子波形

Fig. 3. Three pulse profiles for seed laser generated by AOM

下载: 全尺寸图片幻灯片

图 4 (a)—(c)实验设计的三种种子脉冲波形及脉冲放大至最高能量时的波形对比; (d)—(f)主放大级脉冲激光放大过程中脉冲宽度与泵浦功率的关系

Fig. 4. (a)–(c) Comparison of the designed three typical seed pulses and the pulses amplified to the maximum energy; (d)–(f) the pulse width as a function of pump power in main amplifier stage.

下载: 全尺寸图片幻灯片

图 5 三种波形脉冲的　(a)脉冲能量和(b)峰值功率与主放大级泵浦功率的关系

Fig. 5. (a) Pulse energy and (b) peak power of the three pulses as a function of pump power in main amplifier stage.

下载: 全尺寸图片幻灯片

图 6 三种波形脉冲放大过程中激光线宽与主放大级泵浦功率的关系

Fig. 6. Spectral linewidth evolution of the three pulses as a function of pump power in main amplifier.

下载: 全尺寸图片幻灯片

图 7 脉冲2放大至最高能量130.9 μJ时 (a)光谱和(b)偏振消光比

Fig. 7. (a) Spectrum and (b) PER of pulse 2 at the maximum pulse energy of 130.9 μJ.

下载: 全尺寸图片幻灯片

[1]	Kotov L V, Likhachev M E, Bubnov M M, Paramonov V M, Belovolov M I, Lipatov D S, Guryanov A N 2014 Lasers Phys. Lett. 11 095102 Google Scholar
[2]	Pichugina Y L, Banta R M, Alan Brewer W, Sandberg S P, Michael Hardesty R 2012 J. Appl. Meteorol. Climatol. 51 327 Google Scholar
[3]	Fu S J, Shi W, Feng Y, et al. 2017 J. Opt. Soc. Am. B: Opt. Phys. 34 A49 Google Scholar
[4]	Wan P, Liu J, Yang L M, Amzajerdian F 2011 Opt. Express 19 18067 Google Scholar
[5]	Khudyakov M M, Lipatov D S, Gur’yanov A N, Bubnov M M, Likhachev M E 2020 Opt. Lett. 45 1782 Google Scholar
[6]	Nikles M, Thevenaz L, Robert P A 1997 J. Lightwave Technol. 15 1842 Google Scholar
[7]	Li Y, Wang Y P, Zhang D M, Xiong C, Li P X 2024 Infrared Phys. Technol. 136 105007 Google Scholar
[8]	刘驰, 冷进勇, 漆云凤, 周军, 丁亚茜, 董景星, 魏运荣, 楼祺洪 2011 中国激光 38 0502001 Google Scholar Liu C, Leng J Y, Qi Y F, Zhou J, Ding Y X, Dong J X, Wei Y R, Lou Q H 2011 Chin. J. Lasers 38 0502001 Google Scholar
[9]	田浩, 史朝督, 付士杰, 盛泉, 孙帅, 张帅, 张钧翔, 石争, 蒋沛恒, 史伟, 姚建铨 2021 中国激光 49 1301005 Tian H, Shi C D, Fu S J, Sheng Q, Sun S, Zhang S, Zhang J X, Shi Z, Jiang P H, Shi W, Yao J Q 2021 Chin. J. Lasers 49 1301005
[10]	Nicholson J W, DeSantolo A, Yan M F, Wisk P, Mangan B, Puc G, Yu A W, Stephen M A 2016 Opt. Express 24 19961 Google Scholar
[11]	Wu J F, Jiang S B, Luo T, Geng J H, Peyghambarian N, Barnes N P 2006 IEEE Photonics Technol. Lett. 18 334 Google Scholar
[12]	Fang Q, Shi W, Kieu K, Petersen E, Chavez-Pirson A, Peyghambarian N 2012 Opt. Express 20 16410 Google Scholar
[13]	Lee W, Geng J, Jiang S, Yu A W 2018 Opt. Lett. 43 2264 Google Scholar
[14]	Akbulut M, Kotov L, Wiersma K, Zong J, Li M, Miller A, Chavez-Pirson A, Peyghambarian N 2021 Photonics 8 15 Google Scholar
[15]	秦冠仕, 郭晓慧, 贾志旭, 秦伟平 CN202111465449.1 [2022-01-21]] Qin G S, Guo X H, Jia Z X, Qin W P CN202111465449.1 [2022-01-21]
[16]	Robin C, Dajani I 2011 Opt. Lett. 36 2641 Google Scholar
[17]	Zhang L, Cui S Z, Liu C, Zhou J, Feng Y 2013 Opt. Express 21 5456 Google Scholar
[18]	Zhang X, Diao W F, Liu Y, Zhu X P, Yang Y, Liu J Q, Hou X, Chen W B 2014 Appl. Opt. 53 2465 Google Scholar
[19]	Zhang X, Diao W F, Liu Y, Liu J Q, Hou X, Chen W B 2014 Appl. Phys. B-Lasers Opt. 115 123 Google Scholar
[20]	Michalska M, Swiderski J, Mamajek M 2014 Opt. Laser Technol. 60 8 Google Scholar
[21]	Malinowski A, Vu K T, Chen K K, Nilsson J, Jeong Y, Alam S, Lin D, J. Richardson D 2009 Opt. Express 17 20927 Google Scholar
[22]	Wang Y P, Li Y, Zhang D M, Xiong C, Li P X 2023 Front. Phys. 11 1330573 Google Scholar
[23]	Zhang H, Li G Z, Qiao W C, Xu R, Huan H W, Li T, Zhao X, Wang A M, Liu Y Z 2023 J. Lightwave Technol. 41 4822 Google Scholar

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基于种子脉冲预整形的130 μJ线偏振单频12 μm纤芯铒镱共掺光纤激光器