激光束光强分布对材料激光加热的影响
Influence of laser spacial profile on laser heating material
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摘要: 对激光强度空间均匀分布光束、高斯、超高斯以及平顶高斯光束进行了分析比较，在激光功率与光斑半径相同条件下，计算了各种光束的峰值光强和光束填充因子与光束阶次的关系，给出了光强分布的表达式。并将不同空间分布的光束作为热源，耦合到材料热传导方程中，以数值计算说明了各种光束辐照下，2mm厚30CrMnSiA钢材料靶面不同的热效应。Abstract: Different laser intensity distributions such as the beam with uniform profile, Gaussian, Super-Gaussian and flattened Gaussian beams are analyzed and compared. Under the same power and radius, the expressions of intensity distributions and beam fill factor varing with beam orders for these beams have been derived. In the heat conduction equation, laser beam with different special profiles as a surface heat source is included. Numerical calculations are performed to give the different thermal effects on a thin 30CrMnSiA metal slab induced by these beams.
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Key words:
- laser heating /
- temperature field /
- super-gaussian beam /
- flattened gaussian beam /
- fill factor
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