We have demonstrated single-shot measurement of electron diffraction patterns for a single-crystal gold foil using 340 keV electron pulses accelerated by intense femtosecond laser pulses with an intensity of 2×1018 W/cm2. The measured electron beam profile is faithfully reproduced by the numerical simulation of the electron trajectory, providing evidence that the electron pulse spontaneously expands in time owing to the velocity spread produced in the acceleration process, but is not distorted in an irreversible nonlinear manner. This study shows that the laser acceleration is promising for the development of pulse compression methods for single-shot femtosecond electron diffraction.
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机译：我们已经证明了使用340 keV电子脉冲对单晶金箔的电子衍射图样进行单次测量，该电子脉冲由强度为2×1018 W / cm2的飞秒激光脉冲加速。通过电子轨迹的数值模拟忠实地再现了测得的电子束轮廓，从而提供了证据，证明了由于加速过程中产生的速度扩展，电子脉冲随时间自发扩展，但并未以不可逆的非线性方式失真。这项研究表明，激光加速技术有望用于单飞秒飞秒电子衍射的脉冲压缩方法的发展。
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