Laser surface texturing using a single diffractive optical element as an alternative for direct laser interference patterning
Laser surface texturing using a single diffractive optical element as an alternative for direct laser interference patterning
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DOI：
10.2351/7.0000030
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发表时间：
2020-08-01
影响因子：
2.1
通讯作者：
Kaplan, Natan
中科院分区：
文献类型：
--
作者：
Brodsky, Alexander;Kaplan, Natan
在这项工作中，我们介绍了一种简单而通用的激光表面纹理（LST）光学设置设计，它提供了比直接激光干涉图案（DLIP）更优越的功能。该方法只需要一个周期衍射光学元件和一个聚焦透镜，同时可以实现无限的空间形状和振幅变化的自由。这个概念是基于衍射光栅的特殊行为，当照亮光栅上的一个区域时，该区域的大小接近于一个周期，而不是像基础光栅研究中通常讨论的那样，有效地无限周期。通过将一维强度曲线拟合为周期平方余弦函数，在二维强度分布上对光栅周期与入射激光束尺寸的特定比值值进行了经验优化。研究了该工作模式的设计特点和公差灵敏度，并讨论了该方法的应用思路，包括光学设计的实例建议，以及该方法所允许的一些定制图形功能。对DLIP设置和LST替代方法进行了详细的比较。
In this work, we introduce a simple and universal optical setup design for laser surface texturing (LST) that provides functionality superior than direct laser interference patterning (DLIP). The method requires only a single periodic diffractive optical element and a focusing lens while enabling unlimited freedom for spatial shaping and amplitude variations. The concept is based on the special behavior of diffraction gratings when illuminating an area on the grating that is close in size to a single period rather than effectively infinite periods as is usually discussed in fundamental grating studies. Empirical optimization for a specific ratio value of grating period and incident laser beam size was done on a two-dimensional intensity distribution by fitting the one-dimensional intensity profile to a periodical squared cosine function. We investigate the design characteristics and tolerance sensitivity for this work regime and discuss some application ideas including practical example suggestion of optical design, and some tailored patterning capabilities allowed by the method. A detailed comparison was made between DLIP setup and the proposed alternative method for LST.