目的 通过悬臂梁振动测量连续光纤激光作用铁基材料产生的推力。方法 利用1500 W振镜式光纤激光器，以一定的激光工艺参数沿宽度方向单道扫描靶材，采用动态分析三维显微系统记录薄带的振动情况，通过对连续波激光推力作用下悬臂梁振动过程的理论分析，建立了铁基材料受到的推力物理模型，并通过实验验证理论公式的准确性，最后研究了推力与激光参数、靶材等之间关系。结果 在不同悬臂梁长度系统下，当激光功率为900 W、扫描速度为3 m/s时，测得钢片受到的平均推力为2.43 mN，该物理模型的结果具有较好的重复性。推力由靶材特性和激光工艺参数共同决定，在靶材不被击穿的情况下，激光功率从300 W增大到1500 W时，钢片受到的推力从0.41 mN增加到12.32 mN。扫描速度从4 m/s下降到1 m/s时，钢片受到的推力为8.69~15.67 mN。粒径小的粉末更容易被气化，产生较大的推力。粉末颗粒由于推力获得的加速度高出重力加速度数倍，大直径的粉末颗粒运动受激光推力的影响更小。结论 通过悬臂梁振动测量得到的推力具有较高的准确性，合理规划激光工艺参数和粉末粒径可以减小推力的影响。这为激光熔覆过程中粉末受到激光推力作用的测量和应用方面提供了一定理论依据。

The work aims to measure the thrust induced on the iron-based material by continuous-wave (CW) fiber laser via analyzing cantilever vibration. The target was scanned by 1500 W galvanometer-type fiber laser in a single track along the width direction of the specimen with certain laser process parameters. The vibration of the ribbons was monitored by a three-dimensional dynamic analysis microsystem. Based on theoretical analysis of cantilever vibration under CW fiber laser thrust, a physical model of thrust on iron-based materials was constituted and accuracy of the theoretical formula was verified by experiments. Finally, the relationship between thrust, laser parameters and target material was studied. For the system of different cantilever lengths, when the laser power was 900 W and the scanning speed was 3 m/s, the average thrust of the steel plate was 2.43 mN. Thus, the results of the physical model showed good repeatability. The thrust was determined by the target characteristics and laser process parameters. When the target was not broken down and the laser power was from 300 W to 1500 W, the thrust of the steel plate increased from 0.41 mN to 12.32 mN. When the scanning speed decreased from 4 m/s to 1 m/s, the thrust of the steel plate was 8.69 mN to 15.67 mN, and the powder with small particle size was more likely to be driven by vaporization, generating larger thrust. The acceleration of powder particles due to thrust was several times higher than that of gravity, and the movement of powder particles in larger size was less affected by laser thrust. The thrust measured via cantilever vibration is relatively accurate and reasonable planning of laser process parameters and powder particle size can reduce the impact of thrust, thus providing certain theoretical basis for the measurement and application of laser thrust on powder in the process of laser cladding.