The reflection of femto- and attosecond soft and hard X-ray pulses from multilayer structures (MSs) was investigated. The conditions are formulated under which the pulse shape and duration barely change upon reflection. The MSs are optimized for the reflection of extremely short pulses, and the possibility of compressing chirped pulses is considered. It is shown that the power reflection coefficient can be appreciably larger than unity. The aperiodic MSs capable of effectively reflecting pulses containing no more than three wave periods are calculated. (C) 2001 MAIK "Nauka/ Interperiodica". [References: 13]
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机译：研究了多层结构（MS）对飞秒和阿秒的软X射线和硬X射线脉冲的反射。规定了在反射时脉冲形状和持续时间几乎不变的条件。 MS已针对极短脉冲的反射进行了优化，并考虑了压缩chi脉冲的可能性。结果表明，功率反射系数可以明显大于1。计算出能够有效反射包含不超过三个波周期的脉冲的非周期性MS。 （C）2001 MAIK“ Nauka / Interperiodica”。 [参考：13]
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