激光光场的大行程相位锁定及控制系统  

Phase Locking and Control System of Laser Field Over a Large Range

作　　者：王自鑫[1] 谢向生[1] 郭晶[1] 李鸣[1] 周建英[1] 

机构地区：[1]中山大学光电材料与技术国家重点实验室,广州510275

出　　处：《光学学报》2006年第6期948-952,共5页Acta Optica Sinica

基　　金：广州市科技计划(4205010);广东省自然科学基金重点项目(036597);国家重点基础研究项目(1999075200)资助课题

摘　　要：提出了一种实现大行程飞秒激光脉冲对相位控制的方法。其设计思想是:在迈克耳孙干涉仪中,利用改变激光偏振态的方法改变输出两光束的光程差因子。在对He-Ne激光输出的两束光实现相位锁定的基础上,进而提出了一种可对于超短激光双脉冲相对相位差实现超大行程控制的方法。对He-Ne激光的动态相位锁定、以及飞秒激光脉冲对的相对相位差控制分别作了实验验证。对He-Ne激光的静态相位锁定结果表明干涉仪两臂光程差可以控制在纳米精度;而飞秒激光脉冲测量自相关曲线与理论拟合结果非常接近,经傅里叶变换可得到较好的单峰谱图。该系统能够在实验范围中几乎无行程限制地实现飞秒激光脉冲对的相对相位动态稳定控制。A phase control method of femtosecond laser pulse pair over a large range is presented, which is based on the assumption that change of the laser polarization state affects the optical path difference factor of the two beams in the Michelson interferometer. Based on the phase locking of the two beams from the He-Ne laser, the relative phase difference control for femtosecond laser pulse pair is achieved over a large range. The dynamic phase locking for the beam from the He-Ne laser and the relative phase difference control for femtosecond laser pulse pair are validated experimentally. The former experimental result shows that the optical path difference of the two arms is controlled within nanometer scale. The measured autocorrelation curve of the femtosecond laser pulse fits the theoretical result well, and the Fourier transform shows a single-peak spectrum. The system can steadily achieve the relative phase difference dynamic control of the femtosecond laser pulse pair almost without limitation of range.

关 键 词：超快光学 超快光谱学 相位控制 反馈控制 

分 类 号：O439[机械工程—光学工程]