采用波长复用技术的激光二极管（LD）光纤耦合方法，将两个不同波长的高功率LD通过准直、波长复合、聚焦经光纤耦合以实现大功率高效率输出。用直径200μm的裸石英光纤对LD输出光束进行准直，根据波长复用的基本原理，设计了波长耦合器件，根据LD和光纤的相关参数设计了聚焦透镜组，将两只波长分别为808nm和980nm、发光面积为100μm×1μm、单管的连续输出功率2W的高功率LD通过上述方法耦合进数值孔径0.22、芯径100μm的多模光纤中，在工作电流为2.5A时，808nmLD和980nmLD总的连续输出功率为4.05W，光纤激光连续输出功率为3.33W，总耦合效率大于82%。%In this paper, the laser diode(LD)fiber coupling method based on the wavelength multiplexing technique is used. Two different wavelengths of beams from two high power laser diodes are coupled into a single multi-mode fiber via collimating,wavelength combining,focusing and coupling to achieve high efficiently high power output. The output light beam from LD is collimated by using a section of the optical fiber with a diameter of 200μm. According to the basic principle of wavelength multiplexing,The wavelength coupling device is designed. The focusing lens set is de-signed with the related technical data of fiber and LD. And,tow diode laser beams at 808nm and 980nm,light-emitting area of 100μm × 1μm,output power of 2W(CW) LDs are coupled into a multi-mode fiber by the above method,with a core diameter of 100μm and a numberical aperture(NA) of 0.22. In the current work for 2.5A, 808nm LD and 980 nm LD total continuous power output is 4.05W, optical fiber laser continuous power output is 3.25W, total coupling efficiency is more than 80%.
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