二维摆动磁场自由电子激光自发辐射的频谱特性
ANGULAR SPECTRUM PROPERTY OF SPONTANEOUS EMISSION IN A TWO-DIMENSIONAL UNDULATOR FREE-ELECTRON LASER
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摘要: 本文对二维摆动磁场自由电子激光的自发辐射频谱进行了理论分析,并对分析结果进行了数值计算.计算结果表明,采用l(lkx=ky)值不同的二维摆动磁场,可以增强第l次谐波的自发辐射强度,从而能够有选择地实现自由电子激光的高次谐波运转.Abstract: The angular spectrum of spontaneous emission in a wo-dimensional undulator free-electron laser is analyzed theoretically. Numerical calcularion shows that the s-th harmonic spontaneous emission power density can be greatly enhanced by using a two-dimensional undulator, for which l=s. so the harmonic number can be selected by selecting l. Therefore, the higher harmonic operation of a free-electon laser can be realized selectively.
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