Vibration reconstruction and optical feedback parameter evaluation based on the direction discrimination in self-mixing interferometry

摘要

Laser diode-based self-mixing interferometry (SMI) is a promising technique for noncontact sensing and its industry. In this paper, a phase unwrapping method in the several optical feedback levels is proposed based on displacement direction. A novel, to the best of our knowledge, method for evaluating the optical feedback factor C simultaneously with the linewidth enhancement is proposed by taking into account the effect of the accuracy of the linewidth enhancement alpha on the evaluated method for C based on the differential feature of vibration reconstruction signal. Simulations and experiments are conducted to verify the proposed method. (C) 2021 Optical Society of America