上海深紫外自由电子激光产生高次谐波EEHG激光的设想
Proposal for High-harmonic EEHG Lasing at Shanghai Deep Ultra-Violet Free-electron Laser
摘要：
回波谐波自由电子激光（EEHG）已在上海深紫外自由电子激光（SDUV-FEL）装置上实现了低次谐波输出，并首次实现了三次谐波输出。而EEHG的高次谐波上转换效率仅在高次谐波处才明显优于其他种子自由电子激光。本文从物理设计和数值模拟两个方面研究了在SDUV-FEL种子激光器中产生10次谐波EEHG激光的可能性。分别研究了两种10次谐波EEHG方案，即种子激光同色和异色两种方案，模拟结果表明，这两种方案都可以作为SDUV-FEL产生10次谐波EEHG激光的候选方案，同时相干同步辐射对EEHG-FEL的性能没有影响，只是使中心辐射频率略有偏移。
英文摘要：
The echo-enabled harmonic generation (EEHG) free-electron laser (FEL) has been already demonstrated at lower harmonics and the first lasing at third harmonic also has been achieved at Shanghai deep ultra-violet FEL (SDUV-FEL). While the great advantage of much higher harmonic up-conversion efficiency of EEHG over other seeded FELs only shows evidently at much higher harmonics. In this paper, we investigate the possibility of EEHG lasing at 10-th harmonic of the seed laser at SDUV-FEL, both physical designs and numerical simulations have been studied carefully. Two proposals of EEHG at 10-th harmonic have been studied respectively, i.e. with the seed lasers of the same color and two difference colors, the simulation results indicate that both approaches could be the candidate for EEHG lasing at 10-th harmonic at SDUV-FEL, meanwhile the coherent synchrotron radiation does not affect the performance of EEHG-FEL but only slightly shifts the central radiation frequency.
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