Feedback efficiency for diode laser wavelength stabilization system

Reflective volume Bragg grating (VBG) is the first choice to improve the output characteristics of the diode laser (DL). The non-sphere equation of fast axis collimation (FAC) lens is simulated. In this paper, based on the ray-trace method, calculation principles and approaches of feedback efficiency for diode laser wavelength stabilization system are investigated, and the tolerance of FAC lens and reflection VBG are presented. The results show the feedback efficiency is not sensitive to VBG spatial location error, but the FAC spatial location error and tilt angle error and the VBG tilt angle error will cause an acute decline of the feedback efficiency.