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题名	大口径钕玻璃片状放大器的增益性能提升研究
作者	谢静
文献子类	硕士
导师	林尊琪
关键词	片状放大器 slab amplifier 小信号增益系数 small signal gain coefficient 数值模拟 numerical simulation 实验验证 experimental test
其他题名	Study on improving gain performance of large aperture Nd:glass slab amplifiers
英文摘要	大口径钕玻璃片状放大器在惯性约束核聚变的高功率激光驱动装置中具有非常重要的地位，其增益性能直接关系到装置的输出能力。目前国内装置的片放增益性能与国外同类装置还存在一定的差距。为了提升片放的增益性能，特别是增益系数，本文从数值模拟和实验验证方面完成了如下工作： 1） 建立数值模型，以钕玻璃的吸收光总量为评价函数优化了氙灯充电LC网络的电流密度。以SGII装置的350mm组合口径放大器为物理模型，依据蒙特卡洛光线追迹法进行追迹计算，得到该装置中氙灯最佳电流密度为1.20kA/cm2。 2） 针对放大器的小信号增益系数的测试,研制了用于激光放大器增益分布及平均增益测量的基于光纤的增益测量仪，该装置具有结构简单、稳定可靠、体积小、测量精度高的特点。 3） 对SGII装置中的350E-SSA进行参数优化，并利用基于光纤的增益测量仪测量了各因素的影响。采用以下途径进行了片放增益性能的提升：首先将LC充电网络的电容从100μF增加至120μF；其次将钕玻璃厚度从45mm减小至40mm；然后将上下反射板的反射率从60%提升至90%；最后将钕离子浓度从2.2wt%提升至3.5wt%。这些措施使得在23kV的充电电压下，钕玻璃片全口径的平均增益系数从4.60%/cm提升至5.70%/cm，对应的储能效率为1.24%。 4） 根据上述实验结果设计了基于光纤的350R-SSA，并利用基于光纤的增益仪进行了离线增益系数测量：充电电压为23kV时获得了5.30%/cm的平均增益系数。利用卡计进行的全口径在线测量得到了5.19 %/cm (电压为22kV)的测量结果，与相同电压下的离线结果（5.21%/cm）吻合较好。 本文通过数值模拟和实验验证研究了提升大口径片状放大器增益性能的有效途径，为了实验室的高功率激光装置实现高通量输出奠定了增益基础。; Large aperture Nd:glass slab amplifiers play an important role in high power laser drivers for inertial confinement fusion, for their gain performance is closely related to output capacity. As so far, gain performance of Nd:glass slab amplifier in domestic drivers is poorer than that of abroad. To improve the gain performance, especially the gain coefficient, we have finished some numerical simulations and experimental tests as follow: 1） Built an ray-tracing procedure to optimize the current density in Xe lamps by taking the absorbable pump in Nd:glass as the merit function. We took the real MSA developed in SGII facility as the physical model and simulated its best current density as 1.20kA/cm2. 2） Created a fiber-based gain coefficient measuring apparatus, which is simple, small, robust, accurate, and immune to electromagnetic. 3） Improved the gain coefficient of the elliptical aperture SSA in SGII facility by steps: firstly, increased the capacity in LC circuit from 100μF to 120μF; secondly, reduced the thickness of Nd:glass from 45mm to 40mm; thirdly, increased the reflectivity of the reflectors from 60% to 90%; and finally, increased the Neodymium ion doping concentration from 2.2wt% to 3.5wt%. These measures brought a significant improvement in the performance of the SSA amplifier as its gain coefficient tested by the fiber-based gain coefficient measuring apparatus was increased from 4.60%/cm to 5.70%/cm. The corresponding storage efficiency is 1.24%. 4） Designed the rectangular aperture SSA based on the results of the work 3) and achieved gain coefficient of 5.30%/cm tested by the fiber-based gain coefficient measuring apparatus when the charging voltage is 23kV. The gain coefficient tested by calorimeter on-line is 5.19%/cm when the charging voltage is 22kV, which agrees well with that of off-line (5.21%/cm). In this paper we have studied the effect methods to improve the gain performance of large aperture Nd:glass slab amplifiers both numerically and experimentally, which entitled the high energy output to the high power laser facility in lab.
学科主题	光学工程
内容类型	学位论文
源URL	[http://ir.siom.ac.cn/handle/181231/30916]
专题	中国科学院上海光学精密机械研究所
作者单位	中国科学院上海光学精密机械研究所
推荐引用方式 GB/T 7714	谢静. 大口径钕玻璃片状放大器的增益性能提升研究[D].

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