钛宝石激光器中飞秒和皮秒脉冲被动同步的研究  

Study on passive synchronization of femtosecond and picosecond pulses in a Ti:sapphire laser

作　　者：刘汉臣[1] 朱长军[1] 贺俊芳[2] 

机构地区：[1]西安工程大学理学院,陕西西安710048 [2]中国科学院西安光学精密机械研究所,陕西西安710119

出　　处：《纺织高校基础科学学报》2009年第1期107-112,共6页Basic Sciences Journal of Textile Universities

基　　金：陕西省自然科学基金资助项目(2007A23);西安工程大学基础研究基金资助项目(XGJ07007)

摘　　要：在双波长钛宝石激光器中通过交叉相位调制实现了飞秒和皮秒脉冲的交叉锁模,得到了被动同步的飞秒和皮秒脉冲.自相关和交叉相关曲线表明飞秒和皮秒脉冲具有很高的同步性,脉冲之间的抖动为51fs.在飞秒和皮秒激光腔分别独立自锁模的情况下,群速弥散和自相位调制决定了自锁模激光脉冲的频谱和时间宽度.在飞秒和皮秒激光腔交叉锁模的情况下,交叉相位调制和增益竞争是决定脉冲频谱和时间宽度变化的主要因素.此外,讨论了被动同步的机制、激光的调谐范围以及锁模的稳定性.Passively synchronized femtosecond and picosecond laser pulses are obtained by achieving cross modelocking induced by cross-phase modulation in a dual-wavelength femtosecond Ti：sapphire laser. The autocorrelations and cross correlation show the femtosecond and picosecond pulses are well synchronized, with a timing jitter of 51 fs. Pulse spectrum and duration in independently self mode-locked laser cavities are primarily governed by group velocity dispersion and self phase modulation, while the variations of pulse spectrum and duration in cross mode-locked laser cavities are mainly dominated by cross-phase modulation and gain competition. In addition, the mechanism for passive synchronization, the tuning range and the mode-locking stability of the laser are discussed.

关 键 词：交叉相位调制 交叉锁模 飞秒脉冲 皮秒脉冲 被动同步 

分 类 号：TN248.1[电子电信—物理电子学]