500 W fiber-coupled semiconductor laser module

The semiconductor laser is widely used in industrial fields, and fiber coupling enables flexible transmission. Accordingly, a 500 W high-efficiency fiber-coupled module was designed. The technologies of beam shaping, spatial multiplexing, polarization multiplexing and fiber coupling were used to couple ten bars into a laser beam. Ten bars were collimated by fast axis collimation lens. Then the beams were transformed, and collimated by slow axis collimation optics. And then the beam were combined. All the beam were focused into a multimode fiber(400m core diameter, NA=0.22) after expanding. Experimental results show that the laser output from the module can reach to 545 W in the current of 70 A, corresponding the laser output from fiber could reach to 518 W. High coupling efficiency as 95% was obtained, electro-optic conversion efficiency is 43%, which makes a foundation for kilowatt fiber-coupling semiconductor laser.