高分辨率玻璃印刷中衍射极限以上的孵育诱导光聚集
Incubation Induced Light Concentration Beyond the Diffraction Limit for High-Resolution Glass Printing
摘要：
在过去的二十年里，人们付出了巨大的努力来理解和控制超短激光脉冲进入各种类型的透明材料，从玻璃和晶体到聚合物甚至生物材料。这种方法开辟了在透明材料内进行确定性和高度局部化修饰的途径，使材料的三维（3D）微加工成为具有极端几何灵活性的复杂结构和器件。由于线性衍射和非线性自聚焦效应，焦体积通常表现出沿纵向拉伸的非对称轮廓。当深入聚焦到用于打印大高度物体的透明基板中时，这种效应变得更加严重。在这项工作中，一个新的激光-材料相互作用制度被确定与特殊的孵化效应源于自我调节的多脉冲相互作用与积累的材料变化。我们的发现揭示了一个焦点体积不变的修改深入内部的熔融石英玻璃，在惊人的传统认为，激光诱导修改的几何形状如下的强度分布的铭文激光相反。一个宏观尺度的几何复杂的玻璃雕塑成功地制造与孵化辅助超短激光雕刻在所有三个维度上的均匀微米分辨率。
英文摘要：
In the past two decades, tremendous efforts have been exerted to understand and control the delivery of ultrashort laser pulses into various types of transparent materials ranging from glass and crystal to polymer and even bio-materials. This approach opens up the route toward determinative and highly localized modification within the transparent materials, enabling three-dimensional (3D) micromachining of the materials into sophisticated structures and devices with the extreme geometrical flexibility. Owing to the linear diffraction and nonlinear self-focusing effects, the focal volume typically exhibits an asymmetric profile stretching along the longitudinal direction. This effect becomes more severe when focusing deeply into the transparent substrates for printing objects of large heights. In this work a new laser-material interaction regime is identified with the exceptional incubation effect originating from self-regulated multiple-pulse interactions with accumulated material changes. Our finding reveals a focal-volume-invariant modification deeply inside the fused silica glass, in striking contrary to the traditional believes that the geometrical shape of the laser induced modification follows the intensity distribution of the inscription laser. A macro-scale geometrically complex glass sculpture is successfully manufactured with the incubation assisted ultrashort laser inscription at uniform micrometer resolutions in all three dimensions.
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