High-power fiber-coupled diode laser module with mini-bar stack

A 976 nm fiber-coupled diode laser module based on stepped prisms and polarization beam combiner is proposed in this paper to solve the mismatch of beam quality in both directions of diode lasers. The beam size was compressed on the fast and slow axis without using a prism stack for beam shaping. Based on that, a laser stack of 8 mini-bars was coupled into a fiber with a core diameter of 200 mu m and a numerical aperture of 0.22. The simulation results show that the output power of the fiber-coupled module is 597 W, the brightness is almost 12.5 MW/(cm(2)center dot sr), and the optical-to-optical conversion efficiency is 93.28%. The fiber-coupled module proposed in this paper can not only achieve high power outputs but is also widely used in the fields of material processing and industrial.