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首页> 外文会议>Conference on Laser Optics 2000: Ultrafast Optics and Superstrong Laser Fields Jun 26-30, 2000, St. Petersburg, Russia >Back Scattering of Ultra Short High Intensity Laser Pulses from Solid Targets at Oblique Incidence
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Back Scattering of Ultra Short High Intensity Laser Pulses from Solid Targets at Oblique Incidence

机译：斜入射时来自固体靶的超短高强度激光脉冲的反向散射

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摘要

Back reflection of short, intense laser pulses at oblique incidence on solid targets is explained with a model where a periodic electron density modulation acts as a diffraction grating. The pump and reflected electromagnetic waves drive through the ponderomotive force the grating and the overall system becomes parametrically unstable. The basic equations governing this system are given. A linearized stability analysis yields the instability growth rate for a homogeneous plasma and the convective gain coefficients for the inhomogeneous case. The results support the feasibility of the suggested mechanism. An absolute instability is predicted to set on at a typical threshold intensity 10~(16) W/cm~2, laser pulse length 100 fs, and spot size 30μm. The instability is shown to saturate at a level of a few percent, because the higher harmonics in the electron density modulation turn the diffraction more diffuse thus reducing both the sustaining ponderomotive force and the back reflection coefficient.
机译：用一个模型解释了短而强的激光脉冲在斜入射到固体靶上的背反射，该模型中周期性的电子密度调制充当衍射光栅。泵浦的电磁波和反射的电磁波通过磁势驱动光栅，整个系统在参数上变得不稳定。给出了控制该系统的基本公式。线性化的稳定性分析可得出均匀等离子体的不稳定性增长率和非均匀情况的对流增益系数。结果支持了该机制的可行性。预计绝对不稳定性将在典型阈值强度10〜（16）W / cm〜2，激光脉冲长度100fs和光斑尺寸30μm时出现。由于电子密度调制中的高次谐波使衍射更加扩散，不稳定被显示为百分之几的饱和，从而降低了维持质动力和背反射系数。

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