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用于汤姆孙散射诊断的高重频高光束质量焦耳级Nd:YAG纳秒激光器

邱基斯 唐熊忻 樊仲维 陈艳中 葛文琦 王昊成 刘昊

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用于汤姆孙散射诊断的高重频高光束质量焦耳级Nd:YAG纳秒激光器

邱基斯, 唐熊忻, 樊仲维, 陈艳中, 葛文琦, 王昊成, 刘昊

High repetition rate and high beam quality joule level Nd: YAG nanosecond laser for Thomson scattering diagnosis

Qiu Ji-Si, Tang Xiong-Xin, Fan Zhong-Wei, Chen Yan-Zhong, Ge Wen-Qi, Wang Hao-Cheng, Liu Hao
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  • 基于激光二极管抽运棒状放大器和板条放大器相结合的方式,研制了一台应用于汤姆孙散射诊断的高重复频率、高光束质量焦耳级的Nd:YAG纳秒激光器. 激光器采用主振荡功率放大的结构,主要包括单纵模种子、预放大单元和能量提取单元三部分. 为了获得高光束质量的激光输出,采用相位共轭技术对激光光束畸变进行补偿. 在重复频率200 Hz、单纵模种子注入单脉冲能量8.23 J的条件下,获得了1.85 J的能量输出. 输出激光的脉冲宽度为5.36 ns,远场光斑为1.72倍衍射极限,能量稳定性(RMS)为1.3%.
    A joule-level Nd: YAG nanosecond laser of high repetition frequency and high beam quality is developed for Thomson scattering diagnosis. The laser is designed as a master oscillator power-amplifier system mainly including single longitudinal mode seed, pre-amplifier unit and energy extraction unit. The single-longitudinal-mode Q-switched laser of a high stability is taken as the seed laser of output pulse at J level. The pre-amplifier unit amplifies the J-level pulse laser beam into hundreds of mJ level. In order to obtain the high-quality laser beam output, phase conjugation is adopted to compensate for the laser beam distortion. The ultra-filtered FC-770 is taken as an SBS gain medium of 0.0011 cm-1 absorption coefficient, 197.9 GW/cm2 optical breakdown threshold and 3.5 cm/GW gain coefficient. The double-pass amplification of SBS phase conjugation could realize a real-time repair towards the non-uniformity, deformation and wavefront aberration caused by thermal distortion of the optical components and the laser amplifier to achieve the uniform amplified beam output of high quality close to the diffraction limit. In the energy extraction unit, the amplifier of large-diameter slab is used for energy amplification. The size of the slab is 7 mm 35 mm138.2 mm of 56 cutting angle and 0.6% Nd3+ doping concentration. The slab is plated by a layer of SiO2 against light leak. Horizontal pumping mode is adopted. And the slow axis of the laser diode is almost the same as the length of the slat and the direction of laser transmission. The single-plane array is composed of 8 groups of vertical stacks and each group consists of 12 laser diode bars of power 200 W. At 200 Hz repetition frequency, 250 s pump pulse width and 140 A pump current, the up to 2.3 J stored energy can be achieved The energy extraction unit achieves high gain amplification and finally outputs high-quality laser beam. Under the condition of 200 Hz high repetition frequency and 8.23 J single pulse energy injected by the single longitudinal mode seed, 1.85 J output energy is gained. The energy extract efficiency of the laser system is 52.46%. The output laser possesses a pulse width of 5.36 ns, a far field beam spot 1.72 times the diffraction-limited value, and 1.3% energy stability (RMS).
      通信作者: 唐熊忻, lotus0311@163.com;fanzhongwei@aoe.ac.cn ; 樊仲维, lotus0311@163.com;fanzhongwei@aoe.ac.cn
    • 基金项目: 国家重大科研装备研制项目(批准号:ZDYZ2013-2)、科技部创新人才推进计划重点领域创新团队(批准号:2014RA4051)和中国科学院青年创新促进会资助的课题.
      Corresponding author: Tang Xiong-Xin, lotus0311@163.com;fanzhongwei@aoe.ac.cn ; Fan Zhong-Wei, lotus0311@163.com;fanzhongwei@aoe.ac.cn
    • Funds: Project supported by the National Research and Development Projects for Key Scientific Instruments, China (Grant No. ZDYZ2013-2), the China Innovative Talent Promotion Plans for Innovation Team in Priority Fields (Grant No. 2014RA4051), and the Youth Innovation Promotion Association, CAS.
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    Andrbe Y, Behn R, Duval B P, Etienne P, Pitzschke A 2011 Fusion Eng. Des. 86 1273

    [3]

    Kim Y G, Lee J H, Lee J, An Y H, Dang J J Jo J M, Lee H Y, Chung K J, Hwang Y S, Na Y S 2015 Fusion Eng. Des. 96-97 882

    [4]

    Qi Y F, Zhu X L, Lou Q H, Ji J H, Dong J X, Wei R R {2007 J. Opt. Soc. Am. B 24 1042

    [5]

    Jae S S, Sangwoo P, Hong J K 2010 Opt. Commun. 283 2402

    [6]

    Yang H D, Li X H, Li G Q, Yuan C H, Tang D C, Xu Q, Qiu R, Wang J B 2011 Acta Phys. Sin. 60 027901 (in Chinese) [杨宏道, 李晓红, 李国强, 袁春华, 唐多昌, 徐琴, 邱荣, 王俊波 2011 物理学报 60 027901]

    [7]

    Liang D W, Joana A, Dario G 2014 Appl. Opt. 53 1856

    [8]

    Yashida H, Masahiro N, Takaki H, Shigeru K, Takaki S, Takaki H 2004 Jpn. J. Appl. Phys. 43 1038

    [9]

    Yang X D, Bo Y, Peng Q J, Zhang H L, Geng A C, Cui Q J, Sun Z P, Cui D F, Xu Z Y 2006 Opt. Commun 266 39

    [10]

    Hatae T, Yatsuka E, Hayashi T, Yoshida H, Ono T, and Kusama Y 2012 , Rev. Sci. Instrum. 83 10E344

    [11]

    Qi Yang Q, Zhu X L, Ma J, Lu T T, Ma X H, Chen W B 2015 Chin. Opt. Lett. 13 061401

    [12]

    Ma X, Wang J, Zhou J, Zhu X, Chen W 2011 Appl. Phys. B 103 809

    [13]

    Pierre R J S, Mordaunt D W, Injeyan H, Berg J G, Hilyard R C, Weber M E, Wickham M G, Harpole G M, Senn R 1997 IEEE J. Selected Topics in Quantum Electronics 3 53

    [14]

    Yang H L, Meng J Q, Ma X H, Chen W B 2014 Chin. Opt. Lett. 12 121406

    [15]

    Hasi W L J, Qiao Z, Cheng S X, Wang X Y, Zhong Z M, Zheng Z X, Lin D Y, He W M, Lu Z W 2013 Opt. Commun. 311 375

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出版历程
  • 收稿日期:  2016-03-22
  • 修回日期:  2016-05-18
  • 刊出日期:  2016-08-05

用于汤姆孙散射诊断的高重频高光束质量焦耳级Nd:YAG纳秒激光器

    基金项目: 国家重大科研装备研制项目(批准号:ZDYZ2013-2)、科技部创新人才推进计划重点领域创新团队(批准号:2014RA4051)和中国科学院青年创新促进会资助的课题.

摘要: 基于激光二极管抽运棒状放大器和板条放大器相结合的方式,研制了一台应用于汤姆孙散射诊断的高重复频率、高光束质量焦耳级的Nd:YAG纳秒激光器. 激光器采用主振荡功率放大的结构,主要包括单纵模种子、预放大单元和能量提取单元三部分. 为了获得高光束质量的激光输出,采用相位共轭技术对激光光束畸变进行补偿. 在重复频率200 Hz、单纵模种子注入单脉冲能量8.23 J的条件下,获得了1.85 J的能量输出. 输出激光的脉冲宽度为5.36 ns,远场光斑为1.72倍衍射极限,能量稳定性(RMS)为1.3%.

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