上海深紫外自由电子激光装置(SDUV-FEL)种子激光传输与注入系统
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摘要
自由电子激光新发展的高增益工作模式(HG;HG,EEHG)具有独特的优势,但需要外种子激光与电子束团相互作用,为满足实验的要求,我们在上海深紫外自由电子激光装置(SDUV-FEL)上建立了新的种子激光传输注入与测量系统,实现了种子激光的有效注入。通过采用光参量放大器(OPA),使得注入激光工作波长大范围可调;通过高精度的光学调节与测量装置,实现种子激光与电子束团的精确同步,精度达到亚皮秒量级,测量结果显示激光对电子束团进行了有效的调制。通过以上技术,在上海深紫外自由电子激光装置(SDUV-FEL)上成功完成了HGHG与EEHG的相关实验。
Background:Free electron laser(FEL) has developed several high gain work modes,including high gain harmonic generation(HGHG),echo-enabled harmonic generation(EEHG),cascade HGHG,etc.Such modes have special advantages but all need external seed laser to modulate the electron beam.Purpose:To carry out such experiments at Shanghai Deep-Ultraviolet Free Electron Laser test facility(SDUV-FEL),a new seed laser system has been established.Methods:The system is consisting of Ti:sapphire laser,optic parameter amplifier(OPA),laser transport line and synchronize measurement system.Results:By such system,wide variation rang of seed laser wavelength(1140-2600 nm) and sub-picosecond level synchronization between seed laser and electron beam have been achieved.Conclusions:We have succeeded carry out HGHG and EEHG experiments at SDUV-FEL and the results show that the seed laser could effectively modulate electron beam.
Background:Free electron laser(FEL) has developed several high gain work modes,including high gain harmonic generation(HGHG),echo-enabled harmonic generation(EEHG),cascade HGHG,etc.Such modes have special advantages but all need external seed laser to modulate the electron beam.Purpose:To carry out such experiments at Shanghai Deep-Ultraviolet Free Electron Laser test facility(SDUV-FEL),a new seed laser system has been established.Methods:The system is consisting of Ti:sapphire laser,optic parameter amplifier(OPA),laser transport line and synchronize measurement system.Results:By such system,wide variation rang of seed laser wavelength(1140-2600 nm) and sub-picosecond level synchronization between seed laser and electron beam have been achieved.Conclusions:We have succeeded carry out HGHG and EEHG experiments at SDUV-FEL and the results show that the seed laser could effectively modulate electron beam.
引文
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7谢家麟,庄杰佳,钟世才,等.北京自由电子激光[J].强激光和粒子束,1989,1(4):289-293 XIE Jialin,ZHUANG Jiejia,ZHONG Shicai,et al.The design and research of Beijing free electron laser facility[J].High Power Laser and Particle Beams,1989, 1(4):289-305
8 ZHAO Zhentang,DAI Zhimin,ZHAO Xiaofeng,et al. The shanghai high-gain harmonic generation DUV free-electron laser[J].Nuclear Instruments and Methods in ??Physics Research Section A,2004,528:591-593
9 ZHAO Zhentang,WANG Dong,CHEN Jianhui,et al. First lasing of an echo-enabled harmonic generation free-electron laser[J].Nature Photonics,2012,6(6): 360-363
2 Bonifacio B,Pellegrini C,Narducci L M.Collective instabilities and high-gain regime in a free electron laser[J].Optics Communications,1984,50(6):373-378
3 YU Lihua.Generation of intense UV radiation by subharmonically seeded single-pass free-electron lasers[J]. Physical Review A,1991,44(8):5178-5193
4 Stupakov G.Using beam echo effect for generation of short-wavelength radiation[J].Physical Review Letters, 2009,102:074801
5 Yu L H,Babzien M,Ben-Zvi I,et al.High-gain harmonic-generation free-electron laser[J].Science,2000, 289:932
6 Xiang D,Colby E,Dunning M,et al.Demonstration of the echo-enabled harmonic generation technique for short-wavelength seeded free electron lasers[J].Physical Review Letters,2010,105:114801
7谢家麟,庄杰佳,钟世才,等.北京自由电子激光[J].强激光和粒子束,1989,1(4):289-293 XIE Jialin,ZHUANG Jiejia,ZHONG Shicai,et al.The design and research of Beijing free electron laser facility[J].High Power Laser and Particle Beams,1989, 1(4):289-305
8 ZHAO Zhentang,DAI Zhimin,ZHAO Xiaofeng,et al. The shanghai high-gain harmonic generation DUV free-electron laser[J].Nuclear Instruments and Methods in ??Physics Research Section A,2004,528:591-593
9 ZHAO Zhentang,WANG Dong,CHEN Jianhui,et al. First lasing of an echo-enabled harmonic generation free-electron laser[J].Nature Photonics,2012,6(6): 360-363