Precision Optics Manufacturing最新文献_第2页

Minimizing polishing times in asphere production by ultra-precision grinding 通过超精密磨削，最大限度地减少非球面加工的抛光时间

Precision Optics Manufacturing Pub Date : 2022-07-15 DOI: 10.1117/12.2631761

A. Rumpel, F. Enderli

引用次数: 0

Precision measurement of large optics up to 850 mm in diameter by use of a scanning point multi-wavelength interferometer 利用扫描点多波长干涉仪对直径达850毫米的大型光学器件进行精密测量

Precision Optics Manufacturing Pub Date : 2022-07-15 DOI: 10.1117/12.2631758

M. Wendel

{"title":"Precision measurement of large optics up to 850 mm in diameter by use of a scanning point multi-wavelength interferometer","authors":"M. Wendel","doi":"10.1117/12.2631758","DOIUrl":"https://doi.org/10.1117/12.2631758","url":null,"abstract":"An established measurement system in asphere production, which is a promising approach in high precision freeform manufacturing as-well, is given by a scanning point interferometer based on a multi-wavelength approach. The scanning principle enables for a great flexibility, reduces setup time and costs, and has almost no limitations in spherical departure. Due to the absolute measurement capability, the utilized multi-wavelength approach is beneficial for segmented and interrupted surfaces, which are common apertures of modern application’s optical elements. This approach has been adapted to allow for large surface measurements of up to 850 mm in diameter with highest accuracy of down to 150 nm peak-to-valley on the maximum aperture. The combination of an optimized metrology frame setup with a unique antivibration system improves long-term stability e.g., enabling a 3σ RMSi repeatability on a hemispheric surface (with 90 kg of additional load) over 10 hours without recalibration of down to 1.7 nm only. This contribution gives a general overview of challenges when measuring complex surfaces, with a special focus on large objects and their requirements. Starting from the based scanning multi-wavelength approach, the newly developed and optimized system hardware will be highlighted, as-well as first measurement results presented. These also include consistency data for different workload e.g., simulating different tooling for the sensitive objects under test.","PeriodicalId":422212,"journal":{"name":"Precision Optics Manufacturing","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117236939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

3D printed flexible workpiece mount for conventional polishing 用于常规抛光的3D打印柔性工件支架

Precision Optics Manufacturing Pub Date : 2022-07-15 DOI: 10.1117/12.2632029

S. Killinger, Michael F. Benisch

{"title":"3D printed flexible workpiece mount for conventional polishing","authors":"S. Killinger, Michael F. Benisch","doi":"10.1117/12.2632029","DOIUrl":"https://doi.org/10.1117/12.2632029","url":null,"abstract":"The full aperture polishing process is a very important step in manufacturing precision optics. For this the brittle glass workpiece needs to be mounted to a specific holder in order to install the lens in the polishing machine. One very common way is to use a precision holder which is machined to the exact diameter of the lens. This precision holder is mostly made from aluminium which leads to inherent difficulties in the combination with the workpiece. The brittle glass on the hard holder surface tends to chip at the corners when not handled carefully. Also, the friction between aluminium and glass is relatively small which may lead to a relative motion in the holder and therefore scratching of the surface. Another aspect is that for each lens diameter a holder must be manufactured. Therefore, more time is needed for the preparation for the process and the efficiency of the optician’s shop decreases. At the TC-Teisnach Optik, we use a commercially available, low-priced 3D Printer in order to manufacture an additional flexible part between lens and holder. This solves the problems which stem from the encounter between two hard surfaces. The friction between holder and lens is increased and the handling is simplified, since the flexible part reduces the risk of edge chipping. Additionally, this brings the possibility to use one aluminium holder for a variety of lens diameters by exchanging the 3D printed part. With this technology a 3D printer with flexible filament acts as a useful extension of an opticians’ shop and can improve the efficiency.","PeriodicalId":422212,"journal":{"name":"Precision Optics Manufacturing","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114334838","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mesoscale surface patterning by ring-shaped lithography for single and array optical elements 单个和阵列光学元件环形光刻的中尺度表面图像化

Precision Optics Manufacturing Pub Date : 2022-07-15 DOI: 10.1117/12.2632159

M. Knoblich, M. Kraus, D. Stumpf, E. Förster, L. Werner, H. Hillmer, R. Brunner

引用次数: 1

Investigation on process stability of laser beam figuring for single nanometer ablation on fused silica 熔融二氧化硅单纳米烧蚀激光束成形过程稳定性研究

Precision Optics Manufacturing Pub Date : 2022-07-15 DOI: 10.1117/12.2632797

Emrah Uluz

引用次数: 0

Centering measurement on aspheres: also double-sided 球面定心测量:也是双面测量

Precision Optics Manufacturing Pub Date : 2022-07-15 DOI: 10.1117/12.2632970

E. Hofbauer, R. Kometer

{"title":"Centering measurement on aspheres: also double-sided","authors":"E. Hofbauer, R. Kometer","doi":"10.1117/12.2632970","DOIUrl":"https://doi.org/10.1117/12.2632970","url":null,"abstract":"In industry, the use of high-performance, high-precision and, at the same time, lightweight optomechanical imaging systems is becoming increasingly important. The use of aspherical surfaces is playing an increasing role as the number of lenses can be reduced and dimensions and weight can be minimized significantly. In the case of an asphere, on the other hand, decentering is possible as both a displacement and a tilting and this is completely independent of one another. Therefore, the aspherical semi-finished products must be subjected to certain centering rules during the grinding and polishing process and used on the production spindles in an optimized and adjusted manner in order to avoid rejects during production. A subsequent centering process, as is usual with spheres, is then no longer possible. The internal centering error in an asphere-sphere is an immanent offset of the center of curvature of spherical surface to the aspherical axis of the second surface. The new approach of the vignetting Field Stop Technology (V-SPOT) makes it possible to precisely record the local, meridional pitch error in the zone or at the edge of the aspherical surface and, together with the centering deviation of the vertex, to determine the aspherical axis and thus the inner centering error. A short insight into the latest application of centering measurement of double-sided aspheres from only one side using the high depth of field and the large measuring range of the V-SPOT principle is given.","PeriodicalId":422212,"journal":{"name":"Precision Optics Manufacturing","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125647648","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparison of robot arm orientations in measuring precision optics 机械臂方向在精密光学测量中的比较

Precision Optics Manufacturing Pub Date : 2022-07-15 DOI: 10.1117/12.2632030

S. Killinger

引用次数: 0

Investigations on the influence of process vibrations in CNC grinding processes on the surface quality of fused silica components 数控磨削过程振动对熔融石英零件表面质量影响的研究

Precision Optics Manufacturing Pub Date : 2022-07-15 DOI: 10.1117/12.2632080

Sebastian Henkel, M. Binder, J. Bliedtner, M. Fritzsche

{"title":"Investigations on the influence of process vibrations in CNC grinding processes on the surface quality of fused silica components","authors":"Sebastian Henkel, M. Binder, J. Bliedtner, M. Fritzsche","doi":"10.1117/12.2632080","DOIUrl":"https://doi.org/10.1117/12.2632080","url":null,"abstract":"The investigations carried out deal with real-time evaluation and recording of vibrations during a CNC grinding process, as well as the analysis and control of process influences on the surface quality of optical components. The experiments were carried out on a 5-axis CNC machine. At the beginning, in planar grinding experiments the present vibration is detected with state-of-the-art vibrometric and optical measurement technology from Polytec. It enables in-process recording of the process vibrations and rapid subsequent topography analysis with the aid of white light interferometry. The measurements aim is to reduce the surface deviations (roughness, mid spatials, waviness) influenced by process vibrations. By carrying out a detailed modal analysis of the CNC machine used, it is possible to detect vibrations and vibration transmissions on the machine and to derive the necessary sensor concept a nd setup. Initial in-process measurements with the aid of a fiber vibrometer showed that the vibrations detected during the grinding process correlate to a high degree with the recorded topography data. It is thus possible to find the characteristic vibrations dependent on the grinding parameters as surface structures on the components, which makes it possible to predict the surface quality produced in the process.","PeriodicalId":422212,"journal":{"name":"Precision Optics Manufacturing","volume":"179 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122139641","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Direct manufacturing of micro lens arrays via laser-ablation and -polishing 通过激光烧蚀和抛光直接制造微透镜阵列

Precision Optics Manufacturing Pub Date : 2022-07-15 DOI: 10.1117/12.2631713

M. Kahle, D. Conrad, Stefan Fricke, Larissa Wilkens

引用次数: 0

Environmentally stable iridium mirror coatings for the infrared spectral range 环境稳定的铱反射涂层用于红外光谱范围

Precision Optics Manufacturing Pub Date : 2022-07-15 DOI: 10.1117/12.2632057

T. Döhring, M. Stollenwerk, Paul Schmitt, A. Szeghalmi

{"title":"Environmentally stable iridium mirror coatings for the infrared spectral range","authors":"T. Döhring, M. Stollenwerk, Paul Schmitt, A. Szeghalmi","doi":"10.1117/12.2632057","DOIUrl":"https://doi.org/10.1117/12.2632057","url":null,"abstract":"Highly reflective metal coatings are essential for numerous optical elements. Established mirror coatings made of silver (Ag) and gold (Au) offer high and broadband self-reflection in the infrared (IR) spectral range but are susceptible to environmental influences and mechanical stress without suitable protective layers. In the long-wavelength spectral range, in particular, the absorption bands of these protective layers partially reduce the high mirror reflectivity again. However, the noble metal iridium (Ir) is hard, extremely dense, and thermally, mechanically, and chemically stable. Iridium provides a similarly high reflectivity in the mid (MIR) and far-infrared (FIR) spectral range, as silver and gold, and high resistance to environmental influences - even without protective layers. In this paper, the different deposition processes, as well as the optical and structural properties of iridium mirror coatings fabricated by atomic layer deposition (ALD) and by magnetron sputtering (MS), are presented and compared with each other. The complex refractive indices for ALD and MS deposited iridium mirror coatings were determined for wavelengths from 200 nm to 20 μm, complementing the existing literature values. We demonstrate that iridium mirror coatings offer a high and broadband reflectivity from the mid to far-infrared spectral range. In contrast to established – protected – silver and gold mirror coatings, the iridium coatings are environmentally durable and thermally stable up to 600°C, even without protective layers. Therefore, as an interesting mirror coating material, iridium has the potential for special applications in infrared astronomy and probably also for industrial instruments.","PeriodicalId":422212,"journal":{"name":"Precision Optics Manufacturing","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128873002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0