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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 method to realize the phase control of large-travel femtosecond laser pulse is proposed. The design idea is: In Michelson interferometer, the method of changing the polarization state of the laser is used to change the optical path difference factor of the two output beams. Based on the phase locking of the two beams output by He-Ne laser, a new method of controlling the large stroke by the relative phase difference of the ultrashort laser double pulse is proposed. The dynamic phase locking of He-Ne laser and the relative phase difference control of femtosecond laser pulse pair were experimentally verified respectively. The static phase-locked results of He-Ne laser show that the optical path difference between the two arms of the interferometer can be controlled at nanometer accuracy. The auto-correlation curve of femtosecond laser pulse measurement is very close to the theoretical fitting result, and the Fourier transform can be better Unimodal spectrum. The system can realize the dynamic stability control of the relative phase of femtosecond laser pulse pair with almost no travel limit in the experimental range.