Properties of the third harmonic of the radiation from self-amplified spontaneous emission free electron laser
Properties of the third harmonic of the radiation from self-amplified spontaneous emission free electron laser
复制标题
自放大自发发射自由电子激光辐射三次谐波的特性
DOI：
10.1103/physrevstab.9.030702
复制
发表时间：
2006
影响因子：
--
通讯作者：
M. Yurkov
中科院分区：
文献类型：
--
作者：
E. Saldin;E. Schneidmiller;M. Yurkov
最近的理论和实验研究表明，具有平面波荡器的自放大自发辐射自由电子激光器（SASE FEL）具有在基频的三次谐波处产生相对强的相干辐射的潜力。在这里，我们详细研究了使用随时间变化的自由电子激光模拟代码获得的SASE自由电子激光中的非线性谐波产生。使用相似性技术，我们提出了普遍的依赖性的时间，光谱和统计特性的奇次谐波的辐射从SASE自由电子激光。特别地，我们导出了饱和时奇次谐波辐射功率的普遍公式。实验还发现，饱和时的相干时间福尔斯与谐波数成反比，相对光谱带宽与谐波数保持恒定。
Recent theoretical and experimental studies have shown that the self-amplified spontaneous emission free-electron laser (SASE FEL) with a planar undulator holds a potential for generation of relatively strong coherent radiation at the third harmonic of the fundamental frequency. Here we present a detailed study of the nonlinear harmonic generation in the SASE FEL obtained with a time-dependent FEL simulation code. Using similarity techniques we present universal dependencies for temporal, spectral, and statistical properties of the odd harmonics of the radiation from SASE FEL. In particular, we derived universal formulas for radiation power of the odd harmonics at saturation. It was also found that coherence time at saturation falls inversely proportional to the harmonic number, and relative spectrum bandwidth remains constant with the harmonic number.