In this paper, the light source is fiber coupled semiconductor laser. The lens system is used to image the image of the fiber end face on the heated object, and the focusing range is 6.5-70mm. Then the trajectory is optimized in the non-sequential mode of ZEMAX. The system uses five lenses and uses a cam structure to achieve zoom. A laser homogenizing zoom system with adjustable spot size in the continuous range of 12mm-151mm at a distance of 1.5m was designed, and the mechanical structure was designed. The system structure is simple, and the uniformity can reach more than 86% in all spot size ranges
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