摘要
红外光谱有着广泛的应用。合肥红外自由电子激光装置能够为用户提供高亮度的中/远红外辐射,为高水平的红外研究提供基础条件。自由电子激光和实验站之间需要用光束线连接起来,以便在完成红外辐射高效输送的同时进行聚焦、诊断等。本文介绍了合肥红外自由电子激光装置红外光束线的设计与性能,主要包括光束线的总体要求、设计方案和布局、光学设计、光斑演化、光束传输、激光的分束取样、激光宏脉冲的在线同步测量、激光光谱的在线同步测量等。调试结果表明,设计达到了预期指标,整个光束线可以稳定运行。
Objective Infrared(IR)spectroscopy has several applications.Hefei Infrared Free-Electron Laser Facility(FELiChEM)can supply bright mid/far-infrared radiation to users and provide energy chemistry research with a powerful infrastructure.A beamline must connect the free-electron laser to the experimental stations.The beamline not only efficiently transmits infrared radiation from the laser to the experimental stations but also performs focus and diagnosis during the transmittance.This paper describes the design and performance of a beamline for a Hefei Infrared Free-Electron Laser Facility,including the general requirements,design scheme and layout,optical design,beam evolution,beam transmission,laser beam splitter,online synchronized measurement of macro pulse structure,and laser wavelength.Methods The beamline consisted of vacuum/prop,optical/focus,and diagnosis subsystems.As shown in Fig.1,the vacuum/prop subsystem contained 25 pieces ofΦ200 mm stainless steel pipes,12 sylphon bellows,15 mirror boxes,and the corresponding support frames,pumps,and gauge valves.The optical/focus subsystem contained two diamond windows,13 pieces ofΦ150 mm 90°parabolic/planar off-axis mirrors,two beam splitters,and five exit windows(CsI/PTX).The far-and mid-infrared lasers passed through the diamond windows.The 0.5 mm thick diamond plate was placed at the Brewster angle to avoid refractive loss because the refractive index of the diamond was extremely high and the laser was fully polarized.They were then reflected by mirrors M1 and M3 to exit the electron beam.Subsequently,the far-infrared laser was reflected to the right and merged into one beam with the mid-infrared laser reflected by M2 at M4.The beam was further reflected upward by mirror M5,to the right by mirror M6,and penetrated the shielding wall into the experimental hall.In the experimental hall,the beam was reflected upward by mirror M7 and directed forward by mirror M8.The beam splitter reflected approximately 5%for diagnosis.Mirrors M9‒M13 distributed the laser to
作者
高琛
鲍骏
周银贵
杨远俊
孙松
朱晓娣
李和廷
张善才
王琳
Gao Chen;Bao Jun;Zhou Yingui;Yang Yuanjun;Sun Song;Zhu Xiaodi;Li Heting;Zhang Shancai;Wang Lin(National Synchrotron Radiation Laboratory,University of Science and Technology of China,Hefei 230029,Anhui,China;School of Physical Sciences,University of Chinese Academy of Science,Beijing 101408,China;School of Physics,Hefei University of Technology,Hefei 230009,Anhui,China;School of Chemistry and Chemical Engineering,Anhui University,Hefei 230601,Anhui,China)
出处
《中国激光》
EI
CAS
CSCD
北大核心
2024年第8期283-291,共9页
Chinese Journal of Lasers
基金
国家自然科学基金(21327901)。
