A 40kW fiber-coupled diode laser for material processing and pumping applications

Abstract

In this paper we present the next step on the roadmap "system scalability towards an output power above 100 kW", first time presented in 2014 [1]. To take a step forward the optical power of the fiber-coupled diode laser has been increased beyond the power level 40kW. The power conversion efficiency exceeds 40%. The laser contains modules with 4 different wavelengths (960nm, 1020nm, 1040nm, 1060nm) there are two modules for each wavelength polarization multiplexed. After the slow-axis collimation these wavelengths are combined using dense wavelength coupling before focusing onto the fiber endface. The delivery-fiber is an uncoated fiber with a diameter of 2 mm and NA 0.22 corresponding a BPP of 220 mm mrad. In a stability test the laser delivered a constant maximum output power with less than +/- 0.5 % variation over 100h. Further results of the optical properties of the laser will be presented in this paper. This new laser is based on a turn-key industrial platform, allowing straight-forward integration into almost any industrial application, like welding or large area heat treatment. As application examples laser welding of thick sheet metal and pumping of an active fiber will be presented. The footprint of the complete system is 2.8 m(2) with a height below 1.8 m

Advances in high power high beam quality diode lasers

“…[57] , 并通过偏振合束 和5个波长合束, 400 μm/0.12光纤输出4600 W [58] . [59] , 并 报 道 了 连 续 输 出 25~40 kW (2000 μm/0.2)的多波长合束光源 [60,61] . 目前叠阵 德国ILT研究所在迷你bar芯片上刻蚀不同周期 光栅, 5个激光单元输出如图4所示的激光波长 [62] , 中 心波长间隔2.5 nm, 采用4个二向分色镜将5个单元激…”

Simulations of multiwavelength cladding pumping of high-power fiber Raman amplifiers

“…Such diode laser sources are pursued vigorously for direct-diode materials processing. [7][8][9] This makes spectrally combined diode lasers attractive candidates for cladding-pumping of fiber Raman sources, which retains the attractions of pumping directly with diode lasers.…”

Wide-Span Multi-Wavelength High-Power Diode-Laser Pumping of Fiber Raman Laser

“…In addition, according to our recent numerical simulations, a total pump bandwidth of ∼1000 cm −1 still allows for > 60% conversion efficiency [6]. This suggests it is possible to pump fiber Raman lasers with spectrally combined multi-kW diode lasers currently being developed for materials processing with rapidly improving performance and power [7], [8].…”