NSF/DFG Collaboration Brinksmeier/Riemer/Lucca:"Ultra-Precision Machining and Near Surface Damage Evolution in Single Crystal Fluorides for Advanced Optics"

NSF/DFG 合作 Brinksmeier/Riemer/Lucca：“用于先进光学的单晶氟化物的超精密加工和近表面损伤演化”

• 批准号: 387318746
• 负责人: Dr.-Ing. Oltmann Riemer
• 金额: --
• 依托单位: Abteilung Fertigungstechnik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/387318746?language=en
• 关键词: NSF; DFG; Collaboration; Brinksmeier; Riemer

NSF/DFG Collaboration Brinksmeier/Riemer (Universität Bremen), Lucca (Oklahoma State University); NSF proposal number # 1727244:The research objective of this proposed study is to test the hypothesis that the degradation in optical performance of single crystal calcium fluoride (CaF2), which has been finished by ul-tra-precision machining, is directly related to the nature and extent of the near surface dam-age introduced. Ultra-precision machining experiments based on linear planing with round nose single crystal diamond tools will be used to determine the critical depth of cut to produce a non-fractured surface for a given crystal orientation.Based on these findings, linear planing and face turning experiments will be performed to generate surfaces for which the surface and subsurface state can be evaluated. Channeling Rutherford backscattering spectrometry (channeling RBS), cross-sectional transmission elec-tron microscopy (XTEM) and high resolution transmission electron microscopy (HR-TEM), and x-ray diffraction (XRD) will be used to provide a quantitative characterization of the sub-surface. The optical performance of the surface will then be assessed by measuring trans-missivity using Ultraviolet-Visible (UV-Vis) spectroscopy and birefringence using a polarime-ter. The project is an international collaboration between Oklahoma State University (OSU), the Laboratory for Precision Machining (LFM) at the University of Bremen, Los Alamos Na-tional Laboratory (LANL) and Carl Zeiss Jena GmbH.The mechanisms responsible for the degradation in optical quality caused by the ultra-precision machining of single crystal fluorides, in particular calcium fluoride (CaF2) are not scientifically understood. This lack of understanding is limiting applications where diamond turning, as opposed to polishing, is required, e.g., nanometer precision aspheric or free-form optics. It is expected that this study will contribute to new fundamental understanding of both the nature and extent of subsurface damage introduced into these brittle, optical materials by ultra-precision (single point diamond) machining. It is envisioned that the findings of this work will be applicable to a range of single crystal alkaline earth fluorides which are finding emerg-ing uses in optical applications. The study will establish a quantitative link between spectrally resolved optical performance and subsurface damage. It will determine whether the degrada-tion in optical performance of single crystal calcium fluoride is directly related to the nature and extent of the near surface damage introduced.

NSF/DFG合作Brinksmeier/Riemer（不来梅大学），卢卡（俄克拉荷马州立大学）； NSF提案编号＃1727244：这项提出的研究的研究目标是测试以下假设：由UL-TRA-PRECISION加工完成的单晶氟化钙（CAF2）的光学性能降解与引入了近表面坝的性质和程度直接相关。将使用基于线性计划的超精确加工实验，圆鼻单晶体钻石工具将用于确定切割的临界深度，以产生给定晶体方向的非裂纹表面。在这些发现，线性计划和面部转向实验的基础上，将进行表面和地下表面状态的生成表面。引导拉瑟福德的反向散射光谱法（通道RB），横截面传输ELEC-TRON显微镜（XTEM）和高分辨率透射透射电子显微镜（HR-TEM）和X射线衍射（XRD）将用于提供地下表面的定量表征。然后，将通过使用紫外线（UV-VIS）光谱法和使用Polarime-ter测量跨性别的（UV-VIS）光谱来评估表面的光学性能。该项目是俄克拉荷马州立大学（OSU）的国际合作，这是不来梅大学的精确加工实验室（LFM），洛斯·阿拉莫斯（Los Alamos Na）实验室（LANL）和Carl Zeiss Jena Gmbh。理解。缺乏理解是限制应用，其中钻石转动而不是抛光，例如纳米精度的非球员或自由形式的光学。预计这项研究将有助于对通过超精确（单点钻石）加工引入这些脆性的光学材料的地下损害的性质和程度的新基本了解。可以预见，这项工作的发现将适用于在光学应用中发现紧急用途的一系列单晶地球氟化物。该研究将在频谱解决的光学性能和地下损伤之间建立定量联系。它将确定单晶钙氟化物​​的光学性能是否与引入的近表面损伤的性质和程度直接相关。