Dynamic modulation frequency stabilization technology in laser strong optical feedback system

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.