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用一维粒子模拟研究了超短强激光脉冲与两个固体薄膜靶作用产生X射线的一个方案,特别研究了该方案中产生相对论电子层的源靶的厚度和密度分布对产生x射线的能谱、能量转换效率的影响.数值模拟发现当产生高能电子层的源靶的厚度d与产生的x射线的波长λ/4λ_x~2相当或者更小(λ是入射激光波长)时,才能产生准单色的x射线光谱,否则产生的光谱有极大展宽,且最高频率下降很快.另外,当薄膜靶前面存在不均匀预等离子体时,x射线光谱会明显变差.
One-dimensional particle simulation was used to study the effect of ultrashort laser pulses on the X-ray emission of two solid thin film targets. In particular, the effects of the thickness and density distribution of the source targets generating the relativistic electron layer on the x-ray generation Spectrum and energy conversion efficiency.The numerical simulation shows that when the thickness d of the source target generating the high energy electron layer is equal to or smaller than the wavelength λ / 4λ_x ~ 2 of the generated x-ray (λ is the incident laser wavelength) In monochromatic x-ray spectra, the resulting spectrum is greatly broadened and the maximum frequency drops rapidly. In addition, x-ray spectra deteriorate significantly when there is an uneven pre-plasma in front of the film target.