-
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:
- high energy pulsed laser /
- single-frequency fiber laser /
- pulse pre-shaping /
- stimulated Brillouin scattering
-
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.
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.
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.
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.
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.
-
[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, Zhang L, Yang Z M, Xu S H, Norwood R A Peyghambarian N 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] Qin G S, Guo X H, Jia Z X 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
下载:
计量
- 文章访问数: 104
- PDF下载量: 4
- 被引次数: 0
