The laser interferometry based on self-mixing effect is well-established technique,and widely used to measure displacement,velocity,vibration and distance due to its ompactness,robustness,as well as low cost.We experimentally investigated the self-mixing interference produced by the feedback of light from a vibrated target into vertical-cavity surface-emitting lasers(VCSELs) for sensing applications,and a theoretical analysis by rate equation was proposed.In this paper,the self-mixing vibrometer...