衍射型激光透射塑料焊接技术是一种新型的同步焊接技术。介绍了衍射型激光透射塑料焊接基本原理, 提出了一种基于衍射光学元件的激光同步焊接技术; 建立了衍射模型, 并采用加权G-S算法, 使用Matlab软件模拟计算出权因子大小对所设计的衍射光学元件(DOE)的影响。模拟结果表明, 随着权因子变大, 衍射效率提高, 分布在辐射区域的光强就越多; 均方差(SSE)提高, 整形后光斑的均匀性就降低, 辐射区域的光强就不均。最后, 进行了DOE调制整形的实验, 得到了整形前后激光束光斑形状, 达到预期的图形。

Laser transmission welding of plastics based on diffraction is a new technology of simultaneous welding. This paper introduces the principle of laser transmission welding of plastics based, and tells a laser simultaneous welding technology based on diffractive optical element. Diffractive model is established and based on the weighted G-S algorithm, the influence of the size of weighted factor on the design of diffractive optical element (DOE) is numerically simulated, at the same time, the influence of the size of weighted factor on the welding is analyzed by using Matlab. The simulation results indicate that with the weighted factor increasing, the diffractive efficiency is improved that means the light intensity in the emitting region is enhanced, and meanwhile, sun of square error (SSE) is improved that means the uniformity of the spot is decreased after reshaping, and the light intensity in the emitting region may be non-uniform. Finally, the experiment of modulation and reshaping of DOE is carried out, the pre and post spot shapes are acquired, attaining the expected pattern.