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Spectrally and angularly resolved measurements of three-halves harmonic emission from laser-produced plasmas

机译：激光产生的等离子体的三半谐波排放的光谱和角度分辨测量

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摘要

Spectra of three-halves harmonic emissions (3 omega(0)/2) from laser-produced plasmas were measured at different angles, including both forward and backward sides, from the direction of incident laser beams. The 3 omega(0)/2 emitted from carbon-hydrogen (CH) targets was observed to be larger than that from aluminum (Al) targets with the same incident laser intensity, which supports the argument that the two-plasmon decay (TPD) instability could be inhibited by using medium-Z ablator instead of CH ablator in direct-drive inertial confinement fusion. Besides, the measured 3 omega(0)/2-incident intensity curves for both materials suggest relatively lower threshold of TPD than the calculated values. In experiments with thin Al targets, the angular distribution of the blue-and red-shifted peaks of 3 omega(0)/2 spectra were obtained, which shows that the most intense blue-and red-shifted peaks may not be produced in paired plasmons, but the spectra produced by their 'twin' plasmons were not observed. Because 3 omega(0)/2 may have been influenced by other physical processes during their propagation from their birth places to the detectors, the mismatches on emission angle, wavelength shift, and threshold may be qualitatively explained through the assumption that small-scale light filaments widely existed in the corona of laser-produced plasmas.
机译：从入射激光束的方向，在不同角度，包括向前和向后侧的不同角度测量来自激光产生的等离子体的三半谐波排放的光谱（3Ω/ 2）。从碳 - 氢气（CH）靶发出的3个OMEGA（0）/ 2大于具有相同事件激光强度的铝（Al）靶标的靶标，这支持双体衰减（TPD）的论点通过使用中Z烧蚀器而不是直接驱动惯性限制融合，可以抑制不稳定性。此外，两种材料的测量3 Omega（0）/ 2入射强度曲线表明TPD的阈值比计算值相对较低。在具有薄Al靶标的实验中，获得了3ω（0）/ 2光谱的蓝色和红色偏移峰的角分布，表明最强烈的蓝色和红色偏移峰可能不会以配对产生等离子体，但没有观察到由其“双”等离子体产生的光谱。因为在将其他物理过程的传播期间从其出生地点传播到探测器的其他物理过程可能受到影响，所以通过小规模光的假设可以定性地解释对发射角度，波长偏移和阈值的不匹配在激光产生的等离子体的电晕中广泛存在广泛的丝。

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  • 来源
    《Plasma physics and controlled fusion》 |2017年第10期|共11页
  • 作者

    Kang N.; Liu H.; Lin Z.; Lei A.; Zhou S.; Fang Z.; An H.; Li K.; Fan W.;

  • 作者单位

    Chinese Acad Sci Joint Lab High Power Laser &

    Phys Shanghai Inst Opt &

    Fine Mech Shanghai 201800 Peoples R China;

    Chinese Acad Sci Joint Lab High Power Laser &

    Phys Shanghai Inst Opt &

    Fine Mech Shanghai 201800 Peoples R China;

    Chinese Acad Sci Joint Lab High Power Laser &

    Phys Shanghai Inst Opt &

    Fine Mech Shanghai 201800 Peoples R China;

    China Acad Engn Phys Shanghai Inst Laser Plasma Shanghai 201800 Peoples R China;

    Chinese Acad Sci Joint Lab High Power Laser &

    Phys Shanghai Inst Opt &

    Fine Mech Shanghai 201800 Peoples R China;

    China Acad Engn Phys Shanghai Inst Laser Plasma Shanghai 201800 Peoples R China;

    China Acad Engn Phys Shanghai Inst Laser Plasma Shanghai 201800 Peoples R China;

    Chinese Acad Sci Joint Lab High Power Laser &

    Phys Shanghai Inst Opt &

    Fine Mech Shanghai 201800 Peoples R China;

    Chinese Acad Sci Joint Lab High Power Laser &

    Phys Shanghai Inst Opt &

    Fine Mech Shanghai 201800 Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 等离子体物理学;
  • 关键词

    three-halves harmonic emission; two-plasmon decay instability; small-scale filaments;

    机译：三半谐波发射;双体衰减不稳定;小规模的细丝;

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