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题名	高功率紫外纳秒激光脉冲时间波形集成测量技术研究
作者	唐清
学位类别	硕士
答辩日期	2013
授予单位	中国科学院上海光学精密机械研究所
导师	杨琳
关键词	高功率激光，紫外纳秒脉冲，时间波形，光纤取样，并束测量
其他题名	Integrated Measurement Technology Study on Temporal Waveform of High Power Ultraviolet Nanosecond Laser Pulse
中文摘要	用于惯性约束聚变的高功率激光装置规模庞大，如美国的国家点火装置，输出脉冲数量达到192 路。在物理实验中要求压缩用的三倍频紫外激光脉冲实现功率平衡，因此需要对装置终端输出紫外激光脉冲的时间波形进行精确测量和实时监测。测量高功率紫外激光脉冲时间波形的传统方法是一个测量点利用一个光电管和一个示波器通道，而高功率激光装置的发展趋势是多路激光，激光装置的规模会不断扩大，需要测量的激光束数量也会不断增加，采用传统方法测量需要大量价格昂贵的光电探测器和示波器，不仅增加了测量系统的成本，而且整个测量系统也难以维护和应用。  为了在高功率紫外纳秒激光脉冲时间波形参数测量中减少示波器、快响应光电探测器等设备的使用，降低测量成本，本文提出了采用紫外光纤对高功率紫外纳秒激光脉冲进行取样传输，同时结合时分复用的方法进行并束测量。本文首先对高功率紫外纳秒激光脉冲在光纤中的传输特性和保真传输条件进行了理论分析和模拟研究，根据理论分析和模拟研究的结果选取了不同芯径的阶跃型紫外多模光纤和单模光纤进行了实验研究。研究结果表明，对于 25um芯径的光纤，传输纳秒量级的紫外激光脉冲后脉冲的畸变小，能作较长距离传输，可以作为紫外激光脉冲的取样传输介质。最后，本文利用 25um 芯径的光纤演示了光纤取样传输并束测量实验方案，验证了光纤并束测量的可行性，并根据演示实验结果设计 了相应的光纤取样并束测量包。研究结果为高功率激光装置的三倍频紫外纳秒激光脉冲时间波形的光纤并束测量提供了理论和实验依据。
英文摘要	High power laser facility such as National Ignition Facility is so large that the output laser pulses could reach 192 beams. In the physical experiment, the third-harmonic, ultraviolet laser pulses which will be used to compress the target require power balance, which need to precisely measure and real time monitor the temporal waveform of ultraviolet laser pulses output from the end of the facility. Traditional method of temporal waveform measurement of the high power ultraviolet laser pulse is one measurement point use one photodiode and one oscilloscope channel, but the developmental trend of the high power laser facility is multi-beam, which will increase the quantity of the laser beam, traditional method will require many expensive photodiodes and oscilloscopes, which will not only increase the costs, but also make the measurement system difficult to maintain. In order to lower the costs, and reduce the use of devices such as oscilloscope, fast response photodiode etc. when measuring the temporal waveform of high power ultraviolet laser pulse, use ultraviolet optical fiber to sample and propagate the high power ultraviolet nanosecond laser pulse, meanwhile, integrated measure the temporal waveform by using time division multiplexing method. Through theoretical analysis and simulation study, the propagate characteristics and the condition of distortionless propagation of the high power ultraviolet nanosecond laser pulse in the optical fiber were discussed, according to the results of the theoretical analysis and simulation study, carried out experimental research by using different core diameter of step index multi-mode fibers and single mode fiber. The research results showed that the distortion is low when the high power ultraviolet nanosecond laser pulse propagating in the 25um core diameter fiber, the 25 um core diameter optical fiber is suitable for long distance propagation and is a preferable medium for fiber sampling and propagating. A demonstrative experiment was conducted to verify the integrated measurement by using the 25 um core diameter optical fiber. According to the demonstrative experiment results, designed a fiber sampling and integrated measurement device. These results provided theoretical and experimental basis for the fiber integrated measurement of high power laser pulse.
语种	中文
内容类型	学位论文
源URL	[http://ir.siom.ac.cn/handle/181231/16778]
专题	上海光学精密机械研究所_学位论文
推荐引用方式 GB/T 7714	唐清. 高功率紫外纳秒激光脉冲时间波形集成测量技术研究[D]. 中国科学院上海光学精密机械研究所. 2013.

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