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提出了基于全保偏光纤结构的主振荡脉冲非线性放大系统, 该系统由基于半导体可饱和吸收镜锁模的直线型光纤振荡器、二级放大结构脉冲非线性光纤放大器和具有负色散的单模传导光纤的脉冲压缩器构成. 通过此系统获得了中心波长为1560 nm, 重复频率为200 MHz的超短激光脉冲, 脉冲半高全宽为44 fs, 单脉冲能量可达1 nJ. 随后, 使用厚度为1 mm的掺杂氧化镁的周期性极化铌酸锂晶体进行倍频工作. 实验中使用各类波片、准直及聚焦透镜将放大系统输出的脉冲激光聚焦在极化周期为19.8 μm的晶体位置上. 通过合理调整光路并优化准直聚焦参数获得了平均功率为60 mW, 中心波长为779 nm的倍频脉冲激光输出, 转换效率达到30%. 实验结果表明, 基于全保偏光纤结构的主振荡脉冲非线性放大系统可以产生数十飞秒量级特性良好的脉冲激光.
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关键词:
- 主振荡脉冲非线性放大系统 /
- 非线性放大技术 /
- 全光纤激光放大器 /
- 倍频
The erbium-doped fiber oscillators, especially mode-locked fiber oscillators for generating femtosecond pulses, cannot meet the requirements for most of modern industrial applications because they are resticted by the low power and the limited wavelength range. In order to solve this problem, lots of efforts have been made both theoretically and experimentally, to improve the chirped pulse amplification (CPA) technology. The emergence of CPA technology greatly enhances the energy of laser pulses. The broadening and compressing of the laser pulses are both always dependent on the improving of spatial optical components, such as grating pairs. However, the use of this kind of method can increase the complexity of the amplification system to a certain extent. This may be an essential reason why more and more researchers pay attention to all fiber amplification system. In this paper, the master oscillator pulse nonlinear amplifier system based on all polarization- maintaining fiber is proposed, which is mainly composed of an oscillator based on the semiconductor saturable absorption mirror and linear cavity, a two-stage amplification and a pulse compressor constructed by a single-mode conductive fiber with anomalous dispersion. Using this system, we obtain ultrashort laser pulses in the 1.5 nm band whose pulse width equals 44 fs and single pulse energy reaches about 1 nJ. The system is not only compact and miniaturized but also stable and reliable due to the all polarization-maintaining fiber. Subsequently, an MgO doped periodically poled lithium niobite crystal with a thickness of 1 mm is used to implement frequency doubling. The pulses from the system are accurately focused on a position where the crystal polarization period is 19.8 μm with help of some wave plates and lenses. Adjusting the optical path reasonably and optimizing colliminated focusing parameters, the double-frequency pulse output with certral wavelength of 779 nm and average power of 60 W is obtained, in which the conversion efficiency reaches 30%. The result shows that the master oscillator pulse nonlinear amplifier system based on all polarization maintaining fiber can produce satisfactory ultrashort pulses. It is a new idea for generating the ultrashort femtosecond pulses in the near-infrared band.-
Keywords:
- master oscillator pulse nonlinear amplifier /
- nonlinear amplification technique /
- all-fiber laser amplifier /
- frequency doubling
[1] 付思 2013 硕士学位论文 (北京: 北京交通大学)
Fu S 2013 M. S. Thesis (Beijing: Beijing Jiaotong University) (in Chinese)
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图 1 全保偏光纤MOPNA系统结构示意图 (a)振荡级; (b)放大级; (c)压缩级
Fig. 1. Schematic diagram of MOPNA system based on all polarization maintaining fiber: (a) Oscillator; (b) amplifier; (c) compressor.
图 3 振荡器输出锁模脉冲特性 (a)光谱; (b)自相关曲线; (c)脉冲序列
Fig. 3. The oscillator output: (a) Spectrum curve; (b) autocorrelation curve; (c) pulse sequence.
图 4 预放大级不同抽运功率下的光谱变化
Fig. 4. Variation of the spectrum profiles under different pump powers of the pre-amplifier.
图 5 预放大级输出功率与抽运功率的变化关系
Fig. 5. The relationship between output power and pump power of the pre-amplifier.
图 6 预放大级抽运功率为50 mW时对应的脉冲自相关曲线
Fig. 6. The autocorrelation curve of pre-amplified pulse corresponding to pump power of 50 mW.
图 7 主放大级输出功率与抽运功率的变化关系
Fig. 7. The relationship between output power and pump power of the main amplifier.
图 9 不同输出功率下的最短脉宽及其对应的压缩光纤长度
Fig. 9. The pulse widths versus output powers and the lengths of compression fiber.
图 10 压缩级输出脉冲特性 (a)光谱; (b)自相关曲线
Fig. 10. The optical spectrum: (a) Autocorrelation curve; (b) recompressed pulses.
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[1] 付思 2013 硕士学位论文 (北京: 北京交通大学)
Fu S 2013 M. S. Thesis (Beijing: Beijing Jiaotong University) (in Chinese)
[2] Jazayerifar M, Warm S, Elschner R, Kroushkov D, Sackey I, Meuer C, Schubert C, Petermann K 2013 J. Lightwave Technol. 31 1454
Google Scholar
[3] Sinclair L C, Deschênes J D, Sonderhouse L, Swann W C, Khader I H, Baumann E, Newbury N R, Coddington I 2015 Rev. Sci. Instrum 86 081301
Google Scholar
[4] Meng F, Cao S Y, Zhao G Z, Zhao Y, Fang Z J 2015 Chin. J. Las. 42 0702012
[5] 景磊, 姚建铨, 陆颖, 黄晓慧 2012 天津大学学报 45 95
Jing L, Yao J Q, Lu Y, Huang X H 2012 J. Tianjin Univ. 45 95
[6] Li M, Liu K, Jing W C, Peng G D 2010 J. Opt. Soc. Korea 14 14
Google Scholar
[7] 王强, 许可, 姚晨雨, 王震, 常军, 任伟 2018 中国激光 45 106
Wang Q, Xu K, Yao C Y, Wang Z, Chang J, Ren W 2018 Chin. J. Las. 45 106
[8] 李彦, 黎珂钦, 金靖 2017 中国激光 44 253
Li Y, Li K Q, Jin J 2017 Chin. J. Las. 44 253
[9] Kang J Q, Kong C H, Feng P P, Li C, Luo Z C, Edmund Y L, Kevin K T, Kenneth K Y W 2018 Conference on Lasers and Electro-Optics San Jose, California, United State, May 13−18, 2018 pSW4J.5
[10] Huang L, Zhou X, Tang S 2018 J. Biomed. Opt. 23 1
[11] 刘观辉, 裴丽, 宁提纲, 高篙, 李晶, 张义军 2012 物理学报 61 094205
Google Scholar
Liu G H, Pei L, Ning T G, Gao S, Li J, Zhang Y J 2012 Acta Phys. Sin. 61 094205
Google Scholar
[12] 刘欢, 巩马理, 曹士英, 林百科, 方占军 2015 物理学报 64 114210
Google Scholar
Liu H, Gong M L, Cao S Y, Lin B K, Fang Z J 2015 Acta Phys. Sin. 64 114210
Google Scholar
[13] Eidam T, Hanf S, Seise E, Andersen T V, Gabler T, Wirth C, Schreiber T, Limpert J, Tünnermann A 2010 Opt. Lett. 35 94
Google Scholar
[14] Eidam T, Rothhardt J, Stutzki F, Jansen F, Hädrich S, Carstens H, Jauregui C, Limpert J, Tünnermann A 2011 Opt. Express 19 255
Google Scholar
[15] Sobon G, Kaczmarek P R, Sliwinska D, Sotor J, Abramski K M 2014 IEEE J. Sel. Top. Quantum Electron. 20 492
Google Scholar
[16] 李浪, 刘洋, 王超, 潘海峰 2016 激光技术 40 307
Google Scholar
Li L, Liu Y, Wang C, Pan H F 2016 Laser Technol. 40 307
Google Scholar
[17] Ou S M, Liu G Y, Lei H, Zhang Z G, Zhang Q M 2017 Chin. Phys. Lett. 34 074207
Google Scholar
[18] Sun J, Zhou Y, Dai Y T, Li J Q, Yin F F, Dai J, Xu K 2018 Appl. Opt. 57 1492
Google Scholar
[19] 延凤平, 毛向桥, 王琳, 傅永军, 魏淮, 郑凯, 龚桃荣, 刘鹏, 陶沛琳, 简水生 2009 物理学报 58 6296
Google Scholar
Yan F P, Mao X Q, Wang L, Fu Y J, Wei H, Zheng K, Gong T R, Liu P, Tao P L, Jian S S 2009 Acta Phys. Sin. 58 6296
Google Scholar
[20] Lü Z G, Yang Z, Li F, Yang X J, Tang X J, Yang Y, Li Q L, Wang Y S, Zhao W 2018 Laser Phys. 28 125103
Google Scholar
[21] Fermann M, Kruglov V I, Thomsen B C, Dudley J M, Harvey J D 2000 Phys. Rev. Lett. 84 6010
Google Scholar
[22] BoyD G D, Kleinman D A 1968 J. Appl. Phys. 39 3597
Google Scholar
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