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Description
First lasing and stable operation of a direct-amplification enabled harmonic generation free-electron laser were achieved, with the harmonic number up to 12th from a single-stage modulation and 30th from two-stage modulations employing the beam-echo effect. This work demonstrates for the very first time that high harmonic FEL generation can be facilitate using only one single seed laser with significantly reduced power. Using only one single seed laser makes the operation both simplified and more stable. The substantially reduced seed laser power means high-repetition-rate external seeded XFEL may be feasible now. Moreover, the most promising prospect is that, this scheme relights the path towards the high repetition-rate short-wavelength external seeded XFELs using directly the short wavelength high-order harmonic generation pulses from noble gases.
Footnotes
Z. Qi, J. Liu, C. Feng, Z. Zhao*, et al, PRL 135, 035001 (2025)
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