Analyses of spectral ripple phenomenon in the optical-feedback cavity ring-down spectroscopy

Based on the vector scattering theory, we analyze and discuss the interference effect of the surface scattering lights on the folded mirror of V-shaped cavity. It is found that the interference effect can introduce the periodic fluctuation of scattering loss, and this phenomenon is similar with the spectral ripple effect existed in optical-feedback Cavity Ring-down Spectroscopy (CRDS). We believe that the interference effect of the scattering lights on folded mirror is an important source of spectral ripple effect, and it can be used to explain the mechanism of spectral ripple phenomenon.