High Power Ring Spot Adjustable Fiber Combiner Based on (6+3) ×1 Structure

Aiming at the problems of high loss and low transmission efficiency between two beam combiners of traditional cascade structure, a new structure of all-fiber (6+3)×1 beam combiner is designed. Each input port can independently carry more than 3kw of power, three input ports form a taper fiber bundle to transmit the laser beam to the inner core of the output fiber, the remaining six ports transmit the beam to the outer core of the output fiber, the inner and outer core of the beam can be transmitted independently of the structure of the inner core of the output power is effectively increased. The (6 + 3) × 1 structure of the fiber combiner transmission efficiency of more than 98%, the center of the M2 is 5.32, can withstand the role of backlight. Due to the lithium battery welding on the spattering amount of high requirements, the structure of the output beam energy is more uniform, similar to the flat top distribution, can effectively prevent spattering, at the same time, also for the center of the combiner M2 increase provides a feasible solution.