高增益自由电子激光光阴极注入器驱动激光系统设计考虑  

Study on the Drive Laser System of the Photocathode-injector Used in High Gain FEL

作　　者：鲁向阳[1] 向蓉[1] 赵夔[1] 王莉芳[1] 全胜文[1] 郝建奎[1] 张保澄[1] 陈佳洱[1] 

机构地区：[1]北京大学重离子物理研究所,北京100871

出　　处：《原子能科学技术》2002年第6期527-530,共4页Atomic Energy Science and Technology

基　　金：国家自然科学基金资助项目 (19735 0 0 4)

摘　　要：高增益自由电子激光对电子束团提出了高品质要求 ,只有光阴极微波电子枪能够达到这一目标。光阴极微波电子枪的驱动激光器是这一系统的关键之一。北京大学重离子物理研究所设计的驱动激光系统的指标是提供 2 6 0nm、6～ 8ps宽、5 0 0 μJ的激光脉冲。系统主要由半导体泵浦的钛蓝宝石振荡器、Nd∶YAG调Q泵浦源、再生式放大器、倍频器等组成。系统中采用了腔长调整锁模技术以及相位稳定反馈装置 ,目的是使激光脉冲的时间抖动小于 1 0 ps。High gain FEL requires high quality electron beam which can be provided only by the RF photocathode gun. The drive laser for electron source plays the key role. In Institute of Heavy Ion Physics of Peking University, the laser system is required to deliver a 500 μJ, 6-8 ps pulse of UV photons (260 nm) to the cathode. This system mainly consists of a CW, frequency-doubled, diode-pumped Nd:YAG laser, which provides energy to pump a CW mode-locked Ti:sapphire oscillator, Q-switched Nd:YAG pump lasers, a regenerative amplifier and harmonics crystals. To meet the low jitters of pulses (1.0 ps), cavity length of the oscillator should be adjustable to lock the pulse frequency with external RF reference, and a phase stability feedback system is also used.

关 键 词：光阴极注入器 设计 光阴极微波电子枪 驱动激光器 高增益自由电子激光 

分 类 号：TN248.6[电子电信—物理电子学]