A design of sunlight fiber coupling system with long focal length and large aperture was introduced.In order to reduce the spherical aberration and chromatic aberration of the large aperture single-lens during converging sunlight, a method of reducing aberrations optical system added at the back of focusing lens was proposed, and the optical system that was applicable for optical fiber coupling system was designed and optimized by using Zemax software.The radius of spot size was 45.043 μm, energy concentration was more than 95% , aperture angle was 9.090 2% and the total length of system was 525.584 mm.The coupling requirements of quartz optical fiber with numerical aperture of 0.22 and core diameter of 1.5 mm were satisfied.%介绍一种长焦距、大口径太阳光光纤耦合系统的光学设计.为达到减小大口径单透镜汇聚太阳光所产生的球差和色差的目的,采用聚光透镜后增加消像差光学系统的方法,并用Ze-max软件设计优化出适用于光纤耦合的光学系统,经过优化设计得到光斑半径为45.043μm,能量集中度达95％以上,像方孔径角为9.090 2°,系统总长525.584 mm,满足数值孔径为0.22,芯径直径为1.5 mm的石英光纤的耦合要求.
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