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Experimental and theoretical studies of thermally induced aberrations in optical systems for laser material processing

激光材料加工光学系统中热致像差的实验和理论研究

基本信息

批准号：
244193730
负责人：
Professor Dr. Peter Loosen
金额：
--
依托单位：
Lehrstuhl für Lasertechnik (LLT)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2014
资助国家：
德国
起止时间：
2013-12-31 至 2016-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/244193730?language=en
关键词：
Experimental theoretical studies thermally induced

项目摘要

The development of laser sources towards higher power and improved beam quality enables constantly new applications due to increased power densities and improved focusability. Material processing can be sped up, interaction zones can be reduced and the distance to the workpiece can be enlarged. However, optical elements used for laser beam guiding and shaping are exposed to high thermal loads, which are even increasingly aggravated by the trend for miniaturization. In the consequence, mechanical and optical properties of the elements change. Resulting wave front aberrations of the optical system reduces the beam quality used for the laser processing and also deteriorates an often required optical coaxial process control. The advantages of high brilliant beam sources are thus currently not exhaustively used.The objective of the project proposal is the generation of fundamentals for a coupled multiphysic simulation of thermo-optical influences onto the imaging quality of optical systems for high power laser systems. Thus, the design of optical systems shall be enabled which are robust against thermal disturbance factors. Therefore, an algorithmic coupling of ray tracing and finite element analysis (FEA) is required, in order to enable the simulation of thermally induced wave front aberrations based on characterized glass materials, coatings, mounts and further components. The most important scientific research questions address the determination of energy input and output, the algorithmic interpolation of discret numerical results for providing FEA results in ray tracing simulation and the computation of thermally induced wave front deformations. If a robust model can be developed, steps towards optimization, computation of transient behavior and compensation of thermal effects can be taken.

激光源朝着更高功率和改善光束质量的方向发展，由于功率密度的增加和聚焦性的改善，使得不断有新的应用。材料加工可以加快，相互作用区域可以减少，与工件的距离可以扩大。然而，用于激光束引导和整形的光学元件暴露在高热负荷下，小型化趋势甚至加剧了热负荷。结果，元素的机械和光学性质发生了变化。由此产生的光学系统波前像差降低了用于激光加工的光束质量，也恶化了通常需要的光学同轴过程控制。因此，高亮度光束源的优点目前还没有被充分利用。该项目提案的目标是为高功率激光系统的热光学影响对光学系统成像质量的耦合多物理场模拟生成基础。因此，应使光学系统的设计对热干扰因素具有鲁棒性。因此，需要一种射线追踪和有限元分析（FEA）的耦合算法，以实现基于特征玻璃材料、涂层、支架和其他组件的热诱导波前像差的模拟。其中最重要的科学研究问题是能量输入和输出的确定、射线追迹模拟中离散数值结果的插值算法以及热致波前变形的计算。如果可以建立一个鲁棒模型，就可以采取优化、瞬态行为计算和热效应补偿的步骤。