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高功率KrF激光性能改进及其应用

Performence Provement of the High Power KrF Laser and Its Application

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摘要

采用无阶梯诱导空间非相干技术,对6束角多路高功率KrF激光中一束激光束进行光束平滑,用前端振荡器双程放大自发辐射(ASE)作为部分相干源,此部分相干光经过4f像传递,经电子束抽运预、主放大器放大,聚焦在靶上,靶上能量30 J/40ns,靶斑300μm,分布不均匀性σ≤1.4%.此外,通常23ns前端单束类高斯型脉冲经主振荡功率放大(MOPA)后脉宽展宽为50ns,采用增益饱和开关技术,压缩脉宽经主放后得到30 J/25ns脉冲.用此单束30 J/25ns平滑光束辐照飞片,焦斑直径~300μm,采用双层飞片(50μm Kapton膜+13μm Al),单晶石英靶片,飞片飞行距离(空腔距)~160 μm,用条纹相机对飞片撞靶速度进行了测量,得到飞片速度~8 km/s,与1-D HYADES流体动力学模拟相符.计算了靶中击波压力可大于1 Mboar(100 GPa).用建立的钛宝石,KrF混合型台面紫外高强度超短脉冲(440fs)激光系统,靶面聚焦强度达到1017W/cm2.用此装置进行束靶作用超热电子研究,研制了180°电子磁谱仪,用其直接测量超热电子谱,得到超热电子温度~81 kev.并用此超短脉冲注入电子束抽运KrF预放大器与主放大器得到8 J,皮秒级超短脉冲.并研究了能量信噪比随主放输入增大而下降的规律.

Abstract

A beam smoothing experiment of one beam of the 6-beams high power KrF laser system at CIAE has been demonstrated using the technigue of echelon-free induced spatial incoherence (EF-ISI). The focal profiles with 1.4% rms deviation from a flat top distribution through the laser system capable of producing 30-40 J per pulse in 50 ns at a target were obtained and the 50 ns pulse has been compressed to 25 ns by keeping the same energy per pulse using an optical gain-saturation switch mediod. The flyer acceleration experiments by a high-power smoothing beam KrF laser with a long pulse duration have been made. The flyer consists of Kapton film and Al foil, it is accelerated to the velocity of over 8 km/s by a powr density of 7×1011 W/cm2 driving flyer with a focal spot diameter of 300 μm using KrF laser irradiation. The 1-D hydrodynamics simulation shows that the peak pressure caused by the impact of flyer is over IMbar in the impacted Cu targer. In addition to above experiments the supershort laser amplification through electron pumped preamplifier and main-amplifier and the measurements of super-hot electron temperature for the supershort laser beam interactron with target by a 1800 electron magneto-spectrometer have been conducted.

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中图分类号:TN248.2

基金项目:国家863高技术惯性约束聚变主题与国家自然科学基金(10299046)资助课题。

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单玉生:中国原子能科学研究院, 北京 102413
向益淮:中国原子能科学研究院, 北京 102413
马景龙:中国原子能科学研究院, 北京 102413
汤秀章:中国原子能科学研究院, 北京 102413
龚堃:中国原子能科学研究院, 北京 102413
李业军:中国原子能科学研究院, 北京 102413
张骥:中国原子能科学研究院, 北京 102413
马维义:中国原子能科学研究院, 北京 102413
王乃彦:中国原子能科学研究院, 北京 102413

联系人作者:单玉生(shanys@iris.ciae.ac.cn)

备注:单玉生(1939-)男, 中国原子能科学研究院研究员, 博士生导师,主要从事高功率准分子激光及其与物质相互作用研究。

【1】Shan Yusneng, Wang Naiyan et al.. A six-beam high-power KrF excimer laser system with energy of 100 J/23 ns[J]. Laser and Particle Beams, 2002, 20: 123-127

【2】S. P. Oberschain, S. E. Bodner et al.. the Nike KrF laser facility: performance and initial target experiments [J]. Phys. Plasmas, 1966, 3(5): 2098-2107

【3】A. N. Mostovych, Y. Chan et al.. Reflected shock experiments on the equation-of-state properties of liquid deuterium at 100-600 GPa (1-6 Mbar)[J]. Phys. Rev. Lett., 2000, 85: 38703873

【4】Y. OWADANO et al.. Performance of the ASHURA KrF laser and its upgrading plan [J]. Laser and Particle Beams, 1993, 11 (2): 347~351

【5】T. KADONO, M. YOSHTOA et al.. Flyer acceleration experiments using a KrF laser system with a long pulse duration and pressure and thickness of isobaric zone inducea ш impacted materials[J]. Laser and particle Beams, 2001, 19:623-630

【6】Shan Yusheng, Wang Naiyan, Ma Jinglong et al.. Researches on high power excimer KrF laser and its interaction with target [J]. Chinese J. Lasers, 2002, A29(Suppl.):193~196
单玉生,王乃彦,马景龙等.高功率KrF准分子激光及其束靶相互作用研究[J].中国激光, 2002, A29(増刊):193~ 196

引用该论文

SHAN Yu-sheng,XIANG Yi-huai,MA Jing-long,TANG Xiu-zhang,GONG Kun,LI Ye-jun,ZHANG Ji,MA Wei-yi,WANG Nai-yan. Performence Provement of the High Power KrF Laser and Its Application[J]. Chinese Journal of Lasers, 2004, 31(s1): 373-376

单玉生,向益淮,马景龙,汤秀章,龚堃,李业军,张骥,马维义,王乃彦. 高功率KrF激光性能改进及其应用[J]. 中国激光, 2004, 31(s1): 373-376

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