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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 >X-ray short pulse generation from femtosecond laser-produced plasmas and its application in pump-probe spectroscopy
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X-ray short pulse generation from femtosecond laser-produced plasmas and its application in pump-probe spectroscopy

机译：飞秒激光等离子体产生的X射线短脉冲及其在泵浦探针光谱学中的应用

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摘要

High-density plasmas created near a solid surface by a femtosecond laser pulse emit ultrashort x-ray pulses that are synchronized to the laser pulse. In the first part of this paper, the spectral and temporal properties of the x-ray emitted from plasma created on aluminum film by a femtosecond laser pulse are shown. The minimum pulse duration was <3 ps as measured by an x-ray streak camera. The energy conversion efficiency, from laser pulse into soft x-ray at 14 +- 0.05 run, was 10~(-6)-10~(-5). More than a 30-fold enhancement in soft x-ray emission was achieved by fabricating an array of nanoholes on an alumina surface. In the latter half, we demonstrate time-resolved absorption measurement in the soft x-ray region by means of pump-probe spectroscopy. Using a 10-ps x-ray pulse, we measured time-resolved absorption of optically-pumped silicon near its L(Ⅱ, Ⅲ) edge. We found that laser-pulse irradiation caused a more than 10% increase in soft x-ray absorption near the edge, which means that the transition of electrons in inner shells was rapidly modulated by excitation of valence electrons. The absorption change recovered within 20 ps.
机译：飞秒激光脉冲在固体表面附近产生的高密度等离子体发射超短X射线脉冲，该脉冲与激光脉冲同步。在本文的第一部分中，显示了飞秒激光脉冲在铝膜上产生的等离子体发射的X射线的光谱和时间特性。通过X射线条纹相机测得的最小脉冲持续时间<3 ps。在14±0.05nm时，从激光脉冲到软X射线的能量转换效率为10〜（-6）-10〜（-5）。通过在氧化铝表面上制造纳米孔阵列，可以使软X射线发射增强30倍以上。在后半部分中，我们将通过泵浦探针光谱法演示在软X射线区域中的时间分辨吸收测量。使用10 ps的X射线脉冲，我们测量了光泵浦硅的L（Ⅱ，Ⅲ）边缘附近的时间分辨吸收。我们发现，激光脉冲辐射使边缘附近的软X射线吸收增加了10％以上，这意味着内壳中电子的跃迁通过价电子的激发而迅速得到调节。吸收变化在20 ps内恢复。

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