中文摘要：

激光强回馈系统与弱回馈系统相比,在无任何电子细分条件下就可获得纳米级的分辨率。但是,由于其回馈水平高,容易发生模式转换或偏振跳变,稳频十分困难。提出了一种激光强回馈系统的动态调制稳频方法,研究了动态调制稳频中的零点定位、清零补偿等关键技术及算法。实验结果表明,通过采用动态调制稳频技术,消除了激光强回馈系统中的模式转移及偏振跳变现象,获得了调制均匀、幅值相等的回馈条纹,有效地解决了激光强回馈系统的稳频问题,大大提高了系统的抗干扰能力,对进一步研究高精度强回馈测量系统具有重要意义。

英文摘要：

Compared with laser weak optical feedback, laser strong optical feedback can obtain nano-scale resolution without any electric subdivision. However, it is hard to stabilize the laser frequency owing to the strong feedback level high, which may insults in mode transformation or polarization flipping. A novel technology of dynamic modulation frequency stabilization method was presented. The key technologies and algorithms of zero point and reset compensation were studied systematically. Experimental results show that the uniform modulation and equal amplitude fringes are obtained. The frequency stabilization problem of strong optical feedback system is resolved successfully by using the dynamic modulation frequency stabilization technology. The result plays an important role in developing high accuracy displacement measurement system with strong optical feedback.