近轴光场演化的计算——惠更斯变换
Evolution of paraxial field——Heggens transform
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摘要: 对于远红外自由电子激光使用的大尺度(10m量级)准同心光腔,由于短脉冲效应严重影响功率演化,光束团的数值模拟必须同时考察时域-空域中的演化,因此计算量是巨大的。为了缩小计算量但又不失精确度,发展了一种称为“惠更斯变换”的公式,它以简单的类似基尔霍夫-费涅尔公式的积分运算精确地重现了波荡器之外的光束团演化。
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关键词:
- 惠更斯变换 /
- 短脉冲数值模拟 /
- 大尺度准同心腔 /
- 高平均功率自由电子激光
Abstract: The large scale (ten/tens meters) quasiconcentric cavity used in high average output power farinfrared FEL and the shortpulse effects require that the numerical simulation must involve evolution in both space and time, which means huge quantity of calculating. To decrease quantity of calculating and keep accuracy, an new calculating method named "Heggens transform" was developed which is an integral expression similar to the KirchhoffFresnel expression and can be applied out of undulator.
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