摘要
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。
A novel method of controlling polarization based on adjusting residual stress of laser mirror in laser strong feedback system is presented. The residual stress of laser mirror can be changed with a force applying device and the position of polarization flipping be changed simultaneously. The position of polarization flipping moves from the middle to the edge of the feedback fringe when the frequency difference results from residual stress of laser mirror is reduced from 7. 8MHz to 3. 2MHz. In addition,two feedback fringes with obvious difference of intensity are obtained in this process. A displacement measurement system is designed based on the two feedback fringes. Experimental results show that this measurement system has nano-scale resolution in the range of one hundred micrometers,and the linearity is better than 4 ×10-5.
出处
《激光杂志》
北大核心
2015年第7期5-7,共3页
Laser Journal
基金
国家自然科学基金(61405247)
关键词
激光回馈
偏振态控制
纳米测量
Laser feedback
polarization controlling
nanometer measurement
