We report on two-dimensional near-field imaging experiments of the 11.9-nm Sn x-ray laser that were performed with a set of Mo/Y multilayer mirrors having reflectivities of up to similar to45% at normal and at 45degrees incidence. Second-moment analysis of the x-ray laser emission was used to determine values of the x-ray beam propagation factor M-2 for a range of irradiation parameters. The results reveal a reduction of M-2 with increasing prepulse amplitude. The spatial size of the output is a factor of similar to2 smaller than previously measured for the 14.7-nm 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射线激光的二维近场成像实验，该实验是用一组Mo / Y多层反射镜进行的，该反射镜在正常和45度入射下的反射率最高可达45％。 X射线激光发射的第二矩分析用于确定一系列照射参数的X射线束传播因子M-2的值。结果表明，M-2随预脉冲幅度的增加而减小。输出的空间大小比以前对14.7-nm Pd X射线激光器测得的大小小2倍左右，而X射线发射相对于目标表面的距离大致相同。
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