钛宝石激光飞秒和皮秒脉冲的三种工作模式  

Three operating modes of femtosecond and picosecond pulses in a Ti:sapphire laser

作　　者：朱长军[1] 贺俊芳[2] 翟学军[1] 薛兵[1] 张英堂[1] 张崇辉[1] 

机构地区：[1]西安工程大学理学院物理系,陕西西安710048 [2]中国科学院西安光学精密机械研究所,瞬态光学与光子技术国家重点实验室,陕西西安710119

出　　处：《光电子．激光》2010年第6期837-840,共4页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金资助项目(60978038)

摘　　要：在双光束泵浦的钛宝石激光器中,实现了飞秒和皮秒脉冲的独立自锁模、交叉锁模和多脉冲3种工作模式,分析了飞秒和皮秒激光腔内的群速弥散(GVD)、自相位调制(SPM)、交叉相位调制(XPM)、增益竞争和自振幅调制(SAM)。结果表明:独立自锁模工作模式下,GVD和SPM决定了自锁模激光脉冲的特性;交叉锁模工作模式下,飞秒和皮秒脉冲具有很高的同步性,脉冲间的抖动为517 fs,飞秒和皮秒激光腔的调谐范围分别为36nm和22 nm;多脉冲工作模式下,飞秒脉冲仍然是单脉冲,而皮秒脉冲分裂为3个次脉冲,间隔为426 fs。Three operating modes of femtosecond and picosecond pulses,which are independent self mode-locking,cross mode-locking and multi-pulse operating,are presented in a two-beam-pumped Ti：sapphire laser.Group velocity dispersion,self-phase modulation,cross-phase modulation,gain competition and self-amplitude modulation in the femtosecond and picosecond cavities are analyzed.The results show that,in the independent self mode-locking mode,group velocity dispersion and selfphase modulation largely determine the properties of the self mode-locked pulses,and in the cross mode-locking mode,the femtosecond and picosecond pulses are highly synchronized with a timing jitter of 517 fs and wavelength tuning ranges of 36 and 22 nm in the femtosecond and picosecond cavities,respectively.In the multi-pulse mode,the femtosecond pulse is still a single pulse,while the picosecond pulse splits into three sub-pulses,which is separated in time by 426 fs.

关 键 词：双光束泵浦 飞秒脉冲 皮秒脉冲 工作模式 

分 类 号：O437[机械工程—光学工程]