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Commissioning of a multiple-frequency modulation smoothing by spectral dispersion demonstration system on OMEGA EP

机译:通过OMEGA EP的频谱分散演示系统调试多频调制平滑

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摘要

A one-dimensional smoothing by spectral dispersion (SSD) demonstration system for smoothing focal-spot nonuniformities using multiple modulation frequencies (multi-FM SSD) was commissioned on one long-pulse beamline of OMEGA EP-the first use of such a system in a high-energy laser. System models of frequency modulation-to-amplitude modulation (FM-to-AM) conversion in the OMEGA EP beamline and final optics were used to develop an AM budget. The AM budget in turn provided a UV power limit of 0.85 TW, based on accumulation of B-integral in the final optics. The front end of the demonstration system utilized a National Ignition Facility preamplifier module (PAM) with a custom SSD grating inserted into the PAM's multipass amplifier section. The dispersion of the SSD grating was selected to cleanly propagate the dispersed SSD bandwidth through various pinholes in the system while maintaining sufficient focal-spot smoothing performance. A commissioning plan was executed that systematically introduced the new features of the demonstration system into OMEGA EP. Ultimately, the OMEGA EP beamline was ramped to the UV power limit with various pulse shapes. The front-end system was designed to provide flexibility in pulse shaping. Various combinations of pickets and nanosecond-scale drive pulses were demonstrated, with multi-FM SSD selectively applied to portions of the pulse. Analysis of the dispersion measured by the far-field diagnostics at the outputs of the infrared beamline and the frequency-conversion crystals indicated that the SSD modulation spectrum was maintained through both the beamline and the frequency-conversion process. At the completion of the plan, a series of equivalent-target-plane measurements with distributed phase plates installed were conducted that confirmed the expected time-integrated smoothing of the focal spot.
机译:在OMEGA EP的一条长脉冲光束线上调试了使用一维平滑频谱分散(SSD)演示系统,用于使用多个调制频率来平滑焦点不均匀性(multi-FM SSD)-这是该系统首次在OMEGA EP中使用。高能激光。使用OMEGA EP光束线和最终光学器件中的调频-调幅(FM-AM)转换系统模型来制定AM预算。根据最终光学器件中B积分的累积,AM预算又提供了0.85 TW的UV功率限制。该演示系统的前端使用了国家点火设施前置放大器模块(PAM),并将定制的SSD光栅插入PAM的多通道放大器部分。选择SSD光栅的色散是为了将色散的SSD带宽干净地传播通过系统中的各个针孔,同时保持足够的焦点平滑性能。执行了一项调试计划,该系统将演示系统的新功能系统地引入了OMEGA EP。最终,OMEGA EP光束线以各种脉冲形状上升到UV功率极限。前端系统旨在提供脉冲整形的灵活性。演示了纠察器和纳秒级驱动脉冲的各种组合,其中有选择地将Multi-FM SSD应用于脉冲的一部分。对通过远场诊断在红外光束线和频率转换晶体的输出处测得的色散进行的分析表明,通过光束线和频率转换过程可以保持SSD调制频谱。在计划完成时,进行了一系列安装了分布式相板的等效目标平面测量,确认了预期的焦点时间积分平滑。

著录项

  • 来源
    《High power lasers for fusion research II》|2013年|86020E.1-86020E.11|共11页
  • 会议地点 San Francisco CA(US)
  • 作者单位

    Laboratory for Laser Energetics, Univ. Rochester, 250 E. River Rd., Rochester, NY, USA 14623;

    Laboratory for Laser Energetics, Univ. Rochester, 250 E. River Rd., Rochester, NY, USA 14623;

    Laboratory for Laser Energetics, Univ. Rochester, 250 E. River Rd., Rochester, NY, USA 14623;

    Laboratory for Laser Energetics, Univ. Rochester, 250 E. River Rd., Rochester, NY, USA 14623;

    Laboratory for Laser Energetics, Univ. Rochester, 250 E. River Rd., Rochester, NY, USA 14623;

    Laboratory for Laser Energetics, Univ. Rochester, 250 E. River Rd., Rochester, NY, USA 14623;

    Laboratory for Laser Energetics, Univ. Rochester, 250 E. River Rd., Rochester, NY, USA 14623;

    Laboratory for Laser Energetics, Univ. Rochester, 250 E. River Rd., Rochester, NY, USA 14623;

    Laboratory for Laser Energetics, Univ. Rochester, 250 E. River Rd., Rochester, NY, USA 14623;

    Laboratory for Laser Energetics, Univ. Rochester, 250 E. River Rd., Rochester, NY, USA 14623;

    Laboratory for Laser Energetics, Univ. Rochester, 250 E. River Rd., Rochester, NY, USA 14623;

    Laboratory for Laser Energetics, Univ. Rochester, 250 E. River Rd., Rochester, NY, USA 14623;

    Laboratory for Laser Energetics, Univ. Rochester, 250 E. River Rd., Rochester, NY, USA 14623;

    Laboratory for Laser Energetics, Univ. Rochester, 250 E. River Rd., Rochester, NY, USA 14623;

    Laboratory for Laser Energetics, Univ. Rochester, 250 E. River Rd., Rochester, NY, USA 14623;

  • 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; beam conditioning; dispersion; SSD; polar drive;

    机译:融合激光器;光束平滑光束调节分散; SSD;极地驱动;

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