We report on 2D near-field imaging experiments of the 11.9-nm Sn x-ray laser that were performed with a set of novel Mo/Y multilayer mirrors having reflectivities of up to 40% at normal and at 45° incidence. Second-moment analysis of the x-ray laser emission was used to determine values of the c-ray beam propagation factor M2 for a range of irradiation parameters. The results reveal a reduction of M2 with increasing prepulse intensity. The spatial size of the output is a factor of ～2 smaller than previously measured for the Pd x-ray laser, while the distance of the x-ray emission with respect to the target surface remains roughly the same.
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机译：我们报告了11.9-nm Sn X射线激光器的2D近场成像实验，该近端成像实验与一组新的Mo / Y多层镜，在正常和45°处的反射率高至40％的反射率。 X射线激光发射的第二刻分析用于确定用于一系列照射参数的C射线束传播系数M2的值。结果揭示了较高的Preules强度的M2减少。输出的空间尺寸比以前测量的PD X射线激光器的空间尺寸小，而相对于目标表面的X射线发射的距离保持大致相同。
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