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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。
Strong laser feedback system compared with the weak feedback system, without any electronic subdivision conditions can be obtained nanoscale resolution. However, because of its high level of feedback, mode transitions or polarization jumps easily occur and frequency stabilization is difficult. A dynamic modulation frequency stabilization method for laser strong feedback system is proposed. The key technologies and algorithms of zero-point positioning and zero-clearing compensation in dynamic modulation frequency stabilization are studied. The experimental results show that by using the dynamic modulation frequency stabilization technique, the mode transition and the polarization jump phenomenon in the laser strong feedback system are eliminated, and the uniform and equal amplitude feedback stripes are obtained, which effectively solves the problem that the laser strong feedback system is stable Frequency problem, which greatly improves the anti-interference ability of the system and is of great significance for further research on the high-precision and strong feedback measurement system.