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在激光强回馈系统中,提出了一种基于改变激光腔镜应力控制激光偏振的新方法。通过外部加力装置调节激光腔镜的应力大小,可以改变回馈条纹内偏振跳变发生的位置,当激光腔镜应力对应的双折射频差从7.8MHz减少为3.2MHz时,回馈条纹内的偏振跳变的位置从条纹的中部移动到了条纹的边缘,同时获得了两路光强差值十分显著的回馈条纹。基于该回馈条纹设计了一套微位移测量系统。实验结果表明,该系统在100μm范围内具有纳米级的分辨率,线性度优于4×10-5。
In laser strong feedback system, a new method of controlling laser polarization based on changing laser cavity mirror stress is proposed. By adjusting the stress of the laser cavity mirror by the external force device, the position of the polarization jump in the feedback stripe can be changed. When the birefringence frequency difference corresponding to the laser cavity mirror stress is reduced from 7.8MHz to 3.2MHz, the polarization in the feedback fringe The position of the transition moved from the middle of the stripe to the fringe of the stripe, and at the same time, the two feedback stripes with significant difference of light intensity were obtained. A set of micro-displacement measurement system is designed based on the feedback stripe. The experimental results show that the system has nanometer resolution in the range of 100μm, and the linearity is better than 4 × 10-5.