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Simulations of the propagation of multiple-FM smoothing by spectral dispersion on OMEGA EP

机译：在OMEGA EP上通过频谱分散对多次FM平滑传播的仿真

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摘要

A one-dimensional (1-D) smoothing by spectral dispersion (SSD) system for smoothing focal-spot nonuniformities using multiple modulation frequencies has been commissioned on one long-pulse beamline of OMEGA EP, the first use of such a system in a high-energy laser. Frequency modulation (FM) to amplitude modulation (AM) conversion in the infrared (IR) output, frequency conversion, and final optics affected the accumulation of B-integral in that beamline. Modeling of this FM-to-AM conversion using the code Miro [Morice, O., "Miro: Complete modeling and software for pulse amplification and propagation in high-power laser systems," Opt. Eng. 42(6), 1530-1541 (2003).] was used as input to set the beamline performance limits for picket (short) pulses with multi-FM SSD applied. This article first describes that modeling. The 1-D SSD analytical model of Chuang [Chuang, Y.-H., "Amplification of broad-bandwidth phase-modulated laser counterpropagating light waves in homogeneous plasma," Ph.D. thesis, University of Rochester (September 1991).] is first extended to the case of multiple modulators and then used to benchmark Miro simulations. Comparison is also made to an alternative analytic model developed by Hocquet et al. [Hocquet, S., Penninckx, D., Bordenave, E., Gouedard, C. and Jaoueen, Y., "FM-to-AM conversion in high-power lasers," Appl. Opt. 47(18), 3338-3349 (2008).] With the confidence engendered by this benchmarking, Miro results for multi-FM SSD applied on OMEGA EP are then presented. The relevant output section(s) of the OMEGA EP Laser System are described. The additional B-integral in OMEGA EP IR components upstream of the frequency converters due to AM is modeled. The importance of locating the image of the SSD dispersion grating at the frequency converters is demonstrated. Finally, since frequency conversion is not performed in OMEGA EP's target chamber, the additional AM due to propagation to the target chamber's vacuum window is modeled.
机译：已在OMEGA EP的一条长脉冲光束线上启用了通过频谱色散（SSD）系统进行一维（1-D）平滑处理，以使用多个调制频率来平滑焦点不均匀性，这是该系统首次在高能量激光。红外（IR）输出中的调频（FM）到幅度调制（AM）转换，频率转换以及最终的光学器件影响了该光束线中B积分的累积。使用代码Miro [Morice，O。，“ Miro：用于高功率激光系统中脉冲放大和传播的完整建模和软件”，使用代码Miro对这种FM到AM转换进行建模。 。 42（6），1530-1541（2003）。]用作输入，以设置应用多FM SSD的纠察（短）脉冲的束线性能极限。本文首先介绍该建模。 Chuang的1-D SSD分析模型[Chuang，Y.-H.，“在均质等离子体中对宽带相调制的激光反向传播光波进行放大”。论文，罗切斯特大学（1991年9月）。首先扩展到多个调制器的情况，然后用于对Miro模拟进行基准测试。还与Hocquet等人开发的替代分析模型进行了比较。 [Hocquet，S.，Penninckx，D.，Bordenave，E.，Gouedard，C。和Jaoueen，Y。，“大功率激光器中的FM-AM转换”，应用选择。 47（18），3338-3349（2008）。]通过此基准测试产生了信心，然后给出了在OMEGA EP上应用的多FM SSD的Miro结果。描述了OMEGA EP激光系统的相关输出部分。对由于AM导致的变频器上游OMEGA EP IR组件中的附加B积分进行了建模。说明了在变频器上放置SSD色散光栅图像的重要性。最后，由于未在OMEGA EP的目标腔室中执行频率转换，因此将模拟由于传播到目标腔室的真空窗口而导致的额外AM。

著录项

  • 来源
    《High power lasers for fusion research II》|2013年|86020D.1-86020D.17|共17页
  • 会议地点 San Francisco CA(US)
  • 作者

    J. H. Kelly; A. Shvydky; J. A. Marozas; M. J. Guardalben; B. E. Kruschwitz; L. J. Waxer; C. Dorrer; E. Hill; A. V. Okishev; J.-M. Di Nicola;

  • 作者单位

    Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, NY 14623-1299;

    Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, NY 14623-1299;

    Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, NY 14623-1299;

    Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, NY 14623-1299;

    Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, NY 14623-1299;

    Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, NY 14623-1299;

    Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, NY 14623-1299;

    Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, NY 14623-1299;

    Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, NY 14623-1299;

    Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA 94551-0808;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Fusion lasers; beam smoothing; SSD; polar-drive; dispersion; Miro; simulations; B-integral; beam conditioning;

    机译：融合激光器；光束平滑SSD;极驱动分散;米罗模拟； B积分光束调节;

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