Tunable X-ray frequency comb generation at the Shanghai soft X-ray Free-Electron Laser facility  

作　　者：Lanpeng Ni Yaozong Xiao Zheng Qi Chao Feng Zhentang Zhao 

机构地区：[1]Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai,China [2]Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai,China [3]University of Chinese Academy of Sciences,Beijing,China [4]Zhangjiang Laboratory,Shanghai,China

出　　处：《High Power Laser Science and Engineering》2024年第5期60-69,共10页高功率激光科学与工程(英文版)

基　　金：supported by the National Natural Science Foundation of China(No.12122514);Zhangjiang Laboratory,Project for Young Scientists in Basic Research of the Chinese Academy of Sciences(No.YSBR-091);the Strategy Priority Research Program of the Chinese Academy of Sciences(No.XDB0530300)。

摘　　要：X-ray frequency combs(XFCs)are of great interest in many scientific research areas.In this study,we investigate the generation of high-power tunable XFCs at the Shanghai soft X-ray Free-Electron Laser facility(SXFEL).To achieve this,a chirped frequency-beating laser is employed as the seed laser for echo-enabled harmonic generation of free-electron lasers.This approach enables the formation of an initial bunching of combs and ultimately facilitates the generation of XFCs under optimized conditions.We provide an optical design for the chirped frequency-beating seed laser system and outline a method to optimize and set the key parameters that meets the critical requirements for generating continuously tunable XFCs.Three-dimensional simulations using realistic parameters of the SXFEL demonstrate that it is possible to produce XFCs with peak power reaching 1.5 GW,central photon energy at the carbon K edge(~284 eV)and tunable repetition frequencies ranging from 7 to 12 THz.Our proposal opens up new possibilities for resonant inelastic X-ray scattering experiments at X-ray free-electron laser facilities.

关 键 词：chirped frequency beating echo-enabled harmonic generation free-electron laser optical frequency combs 

分 类 号：TN2[电子电信—物理电子学]