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针对大功率激光加工对光束空间强度分布的实际要求,提出了一种用二元光学元件对光束进行变换的方法,即利用均匀采样的矩形孔径Dammann光栅对激光高斯光束进行光束变换,可满足任意点阵分布的输出要求。以线状、均匀、环状和非均匀分布的光强输出为例,介绍了矩形孔径Dammann光栅光束变换技术的设计原理及实现方法,结果表明输出光强分布具有较高的衍射效率和均匀性。将均匀和非均匀分布的输出光束应用在激光加工技术的表面强化上,结果表明试样表面的硬度和耐磨性等力学性能均有提高并且强化层具有较好的均匀性。
In order to meet the practical requirements of high-power laser processing on spatial distribution of beam intensity, a method of transforming the beam by using binary optical elements is proposed. That is, the uniformly sampled rectangular aperture Dammann grating is used to transform the laser Gaussian beam, The output of the lattice distribution requirements. Taking linear, uniform, annular and non-uniform light intensity output as an example, the design principle and realization method of rectangular aperture Dammann grating beamforming technology are introduced. The results show that the output light intensity distribution has high diffraction efficiency and uniformity . The uniform and non-uniformly distributed output beam is applied to the surface strengthening of laser processing technology. The results show that the mechanical properties such as hardness and wear resistance of the sample surface are improved and the strengthening layer has better uniformity.