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Product Code: PIC2008_902

The Design Method of High-efficiency Coupling of Fiber for the High-power Solid Laser
Authors:
Baohua Wang, Institute of Laser Engineering of Beijing University of Technology; Beijing Peoples Republic of China
Menghua Jiang, Institute of Laser Engineering of Beijing University of Technology; Beijing USA
Kai Pang, Institute of Laser Engineering of Beijing University of Technology; Beijing Peoples Republic of China
Li Qiang, Institute of Laser Engineering of Beijing University of Technology; Beijing Peoples Republic of China
Yongling Hui, Institute of Laser Engineering of Beijing University of Technology; Beijing Peoples Republic of China
Presented at PICALO 2008

The high-power solid laser outputs multimode beam. When we used the classical method defining beam radius, which is used to define 86.5% of the beam spot energy as the radius of basic mode, to design the coupling system, the coupling efficiency was less than 80%. Even when we used 2/3 of the core diameter to design coupling system, the coupling efficiency was still less than 85%. By analyzing the structure of multimode beam, we embedded an equivalent basic mode into the multimode beam, defined 98% of the beam spot energy as the radius of the equivalent basic mode, and designed the coupling system whose coupling efficiency is more than 95%. In order to prove this method, we designed fiber coupling system, and optimized numerical value for the lens aperture and focus. We got the coupling efficiency more than 94% when the input power is 2000W.

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