3D diffractive elements through fs-laser direct writing

飞秒激光直写3D衍射元件

• 批准号: 409765270
• 负责人: Professor Dr.-Ing. Michael Schmidt
• 金额: --
• 依托单位: Lehrstuhl für Photonische Technologien (LPT)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/409765270?language=en
• 关键词: 3D; diffractive; elements; through; fs

Diffractive optical elements (DOEs) are powerful tools for shaping light into almost arbitrary patterns. They find increasing use in advanced laser material processing and imaging applications, for instance to parallelize and thus accelerate fabrication steps.DOEs are commonly made by etching micro-meter structures into the surface of a glass blank. However, it is known that they could be even more powerful and versatile if they were three-dimensional, i.e., if the structures were directly written into the bulk of a small glass slab. Such 3D DOEs could exhibit exquisite sensitivity to color and beam incidence angle, thus enabling a new class of optical elements. For instance, they could be made small enough to fit onto a microscopy glass slide and at the same time sufficiently sensitive to differentiate closely resembling cell types, solely from the light they reflect.Current limitations of realizing 3D DOEs of higher complexity are given by the required large computational costs as well as the lack of fabrication strategies that are sufficiently fast and capable of writing sub-micron sized voxels in millimetre depths. Our research aims to take significant steps towards the realization of 3D DOEs. We plan to develop new algorithms for their design as well as a novel fabrication approach which is apt to fulfil the high demands imposed by the fabrication task. Our approach will be based on parallel femtosecond-laser direct writing (FLDW), where many voxels are simultaneously produced by irradiating the material with short-pulsed laser foci. In the course of our project, we will address the design and production of DOEs with increasing difficulty and complexity. In three subsequent stages we will design and produce 2D, multilayer and finally 3D DOEs.

衍射光学元素（DO）是将光塑造成几乎任意模式的强大工具。他们发现在高级激光材料处理和成像应用中的使用越来越多，例如并行化，从而加速制造步骤。但是，众所周知，如果它们是三维的，即，即使结构直接写入大部分小玻璃板，它们可能会更加强大和通用。这样的3D确实可以表现出对颜色和束入射角的精致敏感性，从而实现了一类新的光学元素。例如，它们可以使它们足够小，以适应显微镜的载玻片，同时完全敏感以区分紧密的细胞类型，仅取决于它们反射的光。我们的研究旨在采取重大步骤，以实现3D。我们计划为其设计开发新算法，以及一种新颖的制造方法，该方法易于满足制造任务施加的高需求。我们的方法将基于平行的飞秒激光直接写作（FLDW），其中许多体素是通过用短脉冲激光焦点照射材料来同时产生的。 在项目过程中，我们将以日益增加的难度和复杂性来解决设计和生产。在随后的三个阶段中，我们将设计和生产2D，多层，最后3D。