【摘要】 第四代光源（Ｘ射线激光）是继第三代同步辐射光源以后，人们正在探索之中的新一代光源，它在亮度、相干性和时间结构上都大大优于第三代同步辐射光源。从目前发展的趋势来看，新一代的短脉冲、高亮度、可调的相干Ｘ射线光源将是基于自放大自发辐射原理的高增益自由电子激光（ＳＡＳＥＰＥＬ）。综述了第四代光源的由来、它和ＳＡＳＥ的关系以及它的优异特性、发展现状以及应用前景。更多还原

【Abstract】 Fourth-generation light sources, which would involve potentially higher brilliance, a higher degree of coherence, and ultrashort pulses, possibly at the hard X-ray region, be based on the self-amplified spontaneous emission principle of free electron lasers, would offer a further major advance in scientific capabilities. In this paper, the development history, the relationship with SASE FEL, the unique properties and the future applications of such sources are summarized and reviewed briefly.更多还原