All-fiber high-brightness single-mode fiber beam combiner and making method

The invention discloses an all-fiber high-brightness single-mode fiber beam combiner and a making method. The fiber beam combiner comprises a glass casing beam combination structure, a multi-core structure and a multi-mode fiber formed sequentially, wherein the glass casing beam combination structure comprises an original single-mode fiber, a glass casing with the same refractive index as a cladding and a glass casing with a low refractive index; the glass casing with the same refractive index as the cladding is located at the outer side of the original single-mode fiber, and the glass casing with the low refractive index is located at the outer side of the glass casing with the same refractive index as the cladding; the multi-core structure comprises a multi-core fiber and an outer cladding structure located at the outer side of the multi-core fiber; and the multi-mode fiber comprises a fiber core and a cladding located at the outer side of the fiber core. The method of the invention is used for making the above fiber beam combiner. Thus, the duty cycle of the fiber beam combiner can be effectively improved, and a high output laser beam quality can be obtained.