Abstract
Due to the substantial contrast in the output beam quality between the two directions
of the semiconductor laser, efficiently coupling the beam directly
into the fiber is difficult. In this study, an efficient shaping
method based on step multiplexing of misaligned step prisms is
proposed and investigated systematically. First, multiple laser stacks
eliminate dark areas to improve the beam quality through the full
utilization of the transmission and reflection surfaces of the
misaligned stepped prisms, which also improves the efficiency of the
stepped prisms. It also simultaneously realizes laser wavelength
combining based on reflective surface multiplexing without affecting
the quality of the beam on the premise of improving the output power.
Finally, the whole beam shaping system is completed without using
cut-transform-rearranging prisms. The method couples four groups of
laser stacks into a single fiber with a fiber diameter of
400 µm and a numerical aperture of 0.22. It can be seen from
the computer-simulated model outputs that the final fiber output power
can reach 2255.4 W and that the system as a whole has a
light-to-light translation rate of 88.1%.
Funder
Key R&D Plan of Jiangsu Province
National Natural Science Foundation of China
Science and Technology Projects of Yangzhou
Yangzhou City and Yangzhou University