The generation and transport of fast electrons play an important role in intense laser interaction with dense plasma. Here, we experimentally study fast electron generation using a planar aluminum target obliquely irradiated at a large incident angle by an ultrashort high-temporal-contrast relativistic laser pulse. Simulations show that for near-relativistic laser intensities, s-polarized lasers above a certain energy threshold can generate energetic electrons () with a high yield, which is different from the case of low laser contrast. It is also shown that the most energetic electrons are emitted along the target’s surface and accelerated to high energies. The key features of the acceleration regimes of lasers with different polarizations are also given.

快速电子的产生和传输在与致密等离子体的强烈激光相互作用中起着重要作用。在这里，我们实验性地研究了使用超短高温对比度相对论激光脉冲以大入射角倾斜照射的平面铝靶材的快速电子生成。仿真表明，对于接近相对论的激光强度，高于某个能量阈值的s偏振激光可以产生高能量的高能电子（），这与低激光对比度的情况不同。还显示出，高能电子沿目标表面发射并加速为高能。还给出了具有不同偏振的激光器的加速机制的关键特征。