共查询到18条相似文献,搜索用时 265 毫秒
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(O)ffner展宽器曲面镜误差对输出脉冲对比度的影响 总被引:1,自引:0,他引:1
在(O)ffner展宽器的设计研究中,对曲面镜曲率半径的误差研究非常重要,它直接影响输出脉冲的质量.因此有必要分析(O)ffner展宽器中曲面镜曲率半径的误差对输出脉冲对比度的影响.参考(O)ffner展宽器的光线追迹模型,建立了(O)ffner展宽器中曲面镜曲率半径存在误差时的光线追迹模型;根据建立的模型.详细分析了曲面镜曲率半径的误差对输出脉冲质量的影响;发现在目前曲面镜曲率半径的加上误差在0.2%~0.5%的情况下,完全可以满足神光Ⅱ拍瓦激光装置中对展宽器的要求;同时发现如果曲面镜曲率半径存在误差时,应该尽量使两曲面镜之间的距离保持为凹面反射镜曲率半径的一半,而不是使两曲面镜保持同心. 相似文献
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通过飞秒放大增益饱和理论及飞秒脉冲展宽的理论计算与分析,指出在优化放大腔结构参数及改变抽运光能量情况下,可以在省略展宽器基础上实现中等能量的飞秒脉冲再生放大.以此为依据,采用低抽运能量和放大腔中钛宝石晶体离焦技术,成功地进行了无展宽器的高重复率飞秒钛宝石再生放大及压缩技术的实验研究,并获得了高光束质量的飞秒放大光脉冲,放大光脉冲能量大于100μJ,重复频率为1kHz,光谱带宽7.7nm,压缩后脉宽500fs.
关键词:
飞秒光脉冲
再生放大
光束质量
增益饱和 相似文献
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适用于亚10 fs的共心衍射无像差展宽器 总被引:1,自引:0,他引:1
在升级5TW/40fs钛宝石激光系统的过程中,伴随10fs种子源的使用,提出并研制了一种新型的共心衍射无像差展宽器和全能量压缩器。该展宽器的最大特点是通过平面镜反射使光束入射时所形成的衍射点与展宽后的还原点均在凹面镜的球心(即共心结构),凹面镜不存在其它同类方法中的成像问题,展宽函数中不涉及凹面镜的焦距和离轴量。该展宽器可将亚10fs的种子脉冲展宽到纳秒量级,且具有无像差、高带宽、结构紧凑、调整精度高等优点,适合100TW级超快激光系统中脉冲展宽。 相似文献
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飞秒激光啁啾脉冲放大中脉冲展宽技术研究 总被引:3,自引:2,他引:1
计算了啁啾脉冲放大技术中光栅展宽器对钛宝石飞秒脉冲的时域展宽量,并从实验中进行了观测.计算了放大器腔内元件的群色散量,进而提出了省略腔外展宽器的可能性. 相似文献
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啁啾脉冲放大系统中光栅展宽器的性能与实验研究 总被引:2,自引:2,他引:0
论述了啁啾脉冲放大技术中运用单光栅展宽器结构将少光脉冲在时域进行啁啾展宽的原理及特性,导出了该展宽器所提供色散量的具体表达式及其展宽后激光脉冲宽度的计算,然后通过数值计算分析了其展宽因子及展宽比随各参量的之间的变化关系;本文在此基础上进一步获得了实验的测量结果。 相似文献
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1 Introduction Chirped pulseamplification (CPA )hasbecomeastandardtechniqueforultrashortpulseamplifications.InconventionalCPAsystems ,theseedpulsesareexpandedintimebypassingthroughastretcher.Theamplifiedpulseisthenrecompressedtotheoriginalpulsedurationby… 相似文献
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为了实现对球面镜真空紫外光谱反射率的直接测量,构建了一套真空紫外光谱反射率测试系统。该系统以氟化镁窗口氘灯与Seya-Namioka凹面光栅单色仪产生单色光源,反射式调制器与参考探测器做光学补偿,内径80mm的荧光积分球与精密转台作为接收系统。光学补偿消除单色光源不稳定性,荧光积分球消除了两次测量光斑不同对探测器响应的影响,且减少了系统的能量损失。利用该系统测量了115~180nm球面镜的反射率,测试结果表明测量重复性优于±0.3%;按国际通用不确定度评估规范,对系统进行不确定度分析,相关不确定度小于1.3%。实现了球面镜反射率的高精度测量。 相似文献
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To ensure safe and effective amplification for the chirped pulse amplification laser facility, many factors such as pulse spectral width, pulse duration, grating parameters and incidence angle parameter are considered carefully in the design of the pulse stretcher. A compact four pass Offner stretcher design is given out. Experiment results show that the stretcher has broad spectral width, large stretching ratio and high transmission efficiency. By comparison, the calculated result of the dispersion effect on the pulse duration is completely consistent with the experiment result. 相似文献
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In this paper we discuss the aberration properties and design procedure of in-plane Ebert spectrograph using conventional
as well as holographic diffraction gratings. In both cases the gratings are situated at the well-known √3-position so that
the spectrum can be recorded on a flat surface. It has been found that the holographic grating system has better resolution
than the conventional grating system. The design parameters of a medium sized holographic grating spectrograph in which a
concave spherical mirror is mounted in the off-axis configuration have been specified. The performance of the spectrograph
has been evaluated by plotting spot diagram. 相似文献
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B.C. Li W. Theobald E. Welsch R. Sauerbrey 《Applied physics. B, Lasers and optics》2000,71(6):819-826
We performed calculations for a chirped-pulse-amplification laser system with a sub-100-fs pulse duration including the finite
size of gratings in an aberration-free stretcher/compressor design. Both the higher-order phase dispersion and the spectral
clipping, which is due to the finite size of the optics in the stretcher and the compressor, are taken into account in the
calculation. We discuss the influence of both phase dispersion and spectral clipping on the important parameters of the recompressed
pulse, such as pulse duration, pulse contrast, and peak intensity, employing different phase-dispersion compensation methods.
The calculations show that the use of a small compressor grating reduces the higher-order phase errors and smoothes the sharp
spectral cut-off caused by spectral clipping in the stretcher, which consequently improves the pulse contrast ratio of the
main pulse to the pedestal.
Received: 1 April 2000 / Published online: 8 November 2000 相似文献
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I. P. Christov 《Optical and Quantum Electronics》1985,17(5):353-357
We examine theoretically the transmission of radiation with rapid temporal modulation (short pulse or rapid statistical modulation) through a grating or focused by a concave mirror (lens). It is shown that the far-field diffraction patterns from a grating may be considerably modified because of such rapid modulation and that these patterns may be used for estimation of the coherence time or the pulse duration. In the case of focusing, the focal spot size slightly increases on decreasing the pulse duration. 相似文献
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R. Khare P.K. Shukla G.K. Mishra C. Mukherjee S. Talwar V.K. Dubey P. Saxena J.K. Mittal 《Optics Communications》2009,282(19):3850-3853
We present an analytical and experimental study of a novel confocal optical pulse stretcher (COPS). The simple and passive pulse stretcher consists of two concave mirrors and a scraper beam-splitter and its optical configuration ensures a perfect spatial overlapping of laser pulses at the beam-splitter. The pulse stretcher is compact and suitable for laser pulses of large divergences. The confocal optical pulse stretcher is demonstrated on a pulsed copper vapour laser to convert a 40 ns (1/e2 % points) pulse into a 55 ns with reduction of peak power by a factor of 1.375 without loss of pulse energy. 相似文献