SPIE LASE最新文献_第10页

Towards photo-induced swimming: actuation of liquid crystalline elastomer in water 光诱导游泳:液晶弹性体在水中的驱动

SPIE LASE Pub Date : 2016-04-06 DOI: 10.1117/12.2219855

G. Cerretti, D. Martella, H. Zeng, C. Parmeggiani, S. Palagi, A. Mark, K. Melde, T. Qiu, P. Fischer, D. Wiersma

引用次数: 1

Towards in-situ process monitoring in selective laser sintering using optical coherence tomography 光学相干层析成像技术在选择性激光烧结现场过程监测中的应用

SPIE LASE Pub Date : 2016-04-06 DOI: 10.1117/12.2210992

Guangying Guan, Zenghai Lu, M. Hirsch, R. Goodridge, D. Childs, S. Matcher, A. Clare, K. Groom

引用次数: 1

The application of digital medical 3D printing technology on tumor operation 数字医疗3D打印技术在肿瘤手术中的应用

SPIE LASE Pub Date : 2016-04-06 DOI: 10.1117/12.2209252

Jimin Chen, Yi-jian Jiang, Yangsheng Li

引用次数: 3

Advanced two-photon photolithography for patterning of transparent, electrically conductive ionic liquid-polymer nanostructures 用于透明、导电离子液体聚合物纳米结构的先进双光子光刻技术

SPIE LASE Pub Date : 2016-04-06 DOI: 10.1117/12.2218272

Natalia Bakhtina, Neil MacKinnon, J. Korvink

{"title":"Advanced two-photon photolithography for patterning of transparent, electrically conductive ionic liquid-polymer nanostructures","authors":"Natalia Bakhtina, Neil MacKinnon, J. Korvink","doi":"10.1117/12.2218272","DOIUrl":"https://doi.org/10.1117/12.2218272","url":null,"abstract":"A key challenge in micro- and nanotechnology is the direct patterning of functional structures. For example, it is highly desirable to possess the ability to create three-dimensional (3D), conductive, and optically transparent structures. Efforts in this direction have, to date, yielded less than optimal results since the polymer composites had low optical transparency over the visible range, were only slightly conductive, or incompatible with high resolution structuring. We have previously presented the novel cross-linkable, conductive, highly transparent composite material based on a photoresist (IP-L 780, OrmoComp, or SU-8) and the ionic liquid 1-butyl-3-methylimidazolium dicyanamide. Material patterning by conventional and two-photon photolithography has been demonstrated as proof-of-concept. Aiming to increase the resolution and to extend the spectrum of exciting applications we continued our research into identifying new ionic liquid - polymer composites. In this paper, we report the precise 3D single-step structuring of optically transparent and electrically conductive ionic liquid - polymer nanostructures with the highest spatial resolution (down to 150 nm) achieved to date. This was achieved via the development of novel cross-linkable composite based on the photoresist IP-G 780 and the ionic liquid 1-butyl-3-methylimidazolium dicyanamide. The successful combination of the developed material with the advanced direct laser writing technique enabled the time- and cost-saving direct manufacturing of transparent, electrically conductive components. We believe that the excellent characteristics of the structured material will open a wider range of exciting applications.","PeriodicalId":314691,"journal":{"name":"SPIE LASE","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132623682","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: 2

Review on laser powder injection additive manufacturing of novel alloys and composites 激光粉末注射增材制造新合金和复合材料的研究进展

SPIE LASE Pub Date : 2016-04-06 DOI: 10.1117/12.2217909

B. Zheng, N. Yang, J. Yee, K. Gaiser, W. Lu, L. Clemon, Yanlin Zhou, E. Lavernia, J. Schoenung

引用次数: 5

Additive manufacturing of glass for optical applications 光学应用玻璃的增材制造

SPIE LASE Pub Date : 2016-04-06 DOI: 10.1117/12.2218137

Junjie Luo, L. Gilbert, D. Bristow, R. Landers, J. Goldstein, A. Urbas, E. Kinzel

{"title":"Additive manufacturing of glass for optical applications","authors":"Junjie Luo, L. Gilbert, D. Bristow, R. Landers, J. Goldstein, A. Urbas, E. Kinzel","doi":"10.1117/12.2218137","DOIUrl":"https://doi.org/10.1117/12.2218137","url":null,"abstract":"Glasses including fused quartz have significant scientific and engineering applications including optics, communications, electronics, and hermetic seals. This paper investigates a filament fed process for Additive Manufacturing (AM) of fused quartz. Additive manufacturing has several potential benefits including increased design freedom, faster prototyping, and lower processing costs for small production volumes. However, current research in AM of glasses is limited and has focused on non-optical applications. Fused quartz is studied here because of its desirability for high-quality optics due to its high transmissivity and thermal stability. Fused quartz also has a higher working temperature than soda lime glass which poses a challenge for AM. In this work, fused quartz filaments are fed into a CO2 laser generated melt pool, smoothly depositing material onto the work piece. Single tracks are printed to explore the effects that different process parameters have on the morphology of printed fused quartz. A spectrometer is used to measure the thermal radiation incandescently emitted from the melt pool. Thin-walls are printed to study the effects of layer-to-layer height. Finally, a 3D fused quartz cube is printed using the newly acquired layer height and polished on each surface. The transmittance and index homogeneity of the polished cube are both measured. These results show that the filament fed process has the potential to print fused quartz with optical transparency and of index of refraction uniformity approaching bulk processed glass.","PeriodicalId":314691,"journal":{"name":"SPIE LASE","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127624463","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: 38

Application of laser ultrasonic non-destructive evaluation technique to additive manufacturing 激光超声无损评价技术在增材制造中的应用

SPIE LASE Pub Date : 2016-04-06 DOI: 10.1117/12.2219866

Anthony J. Manzo, S. Kenderian, H. Helvajian

{"title":"Application of laser ultrasonic non-destructive evaluation technique to additive manufacturing","authors":"Anthony J. Manzo, S. Kenderian, H. Helvajian","doi":"10.1117/12.2219866","DOIUrl":"https://doi.org/10.1117/12.2219866","url":null,"abstract":"The change in properties of a propagating ultrasonic wave has been a mainstay characterization tool of the nondestructive evaluation (NDE) industry for identifying subsurface defects (e.g. damage). A variant of this concept could be applicable to 3D additive manufacturing where the existence of defects (e.g. pores) within a sub-layer could mark a product as non-qualifying. We have been exploring the utility of pulsed laser ultrasonic excitation coupled with CW laser heterodyne detection as an all optical scheme for characterizing sub surface layer properties. The all-optical approach permits a straight forward integration into a laser additive processing tool. To test the concept, we have developed an experimental system that generates pulsed ultrasonic waves (the probe) with high bandwidth (<<10MHz) and a surface displacement sensor that can capture the ultrasonic \"return\" signal with bandwidth close to 300 MHz. The use of high frequencies enables the detection of smaller defect sites. The technique is time resolved with the sensor and probe as point (>>30-200 microns) beams. Current tests include characterizing properties of spot weld joints between two thin stainless steel plates. The long term objective is to transition the technique into a laser additive manufacturing tool.","PeriodicalId":314691,"journal":{"name":"SPIE LASE","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124448399","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: 7

Laser-assisted inkjet printing of highly viscous fluids with sub-nozzle resolution 激光辅助喷墨打印高粘性流体的分喷嘴分辨率

SPIE LASE Pub Date : 2016-04-06 DOI: 10.1117/12.2210833

P. Delrot, M. Modestino, D. Psaltis, C. Moser

{"title":"Laser-assisted inkjet printing of highly viscous fluids with sub-nozzle resolution","authors":"P. Delrot, M. Modestino, D. Psaltis, C. Moser","doi":"10.1117/12.2210833","DOIUrl":"https://doi.org/10.1117/12.2210833","url":null,"abstract":"Drop-on-demand inkjet printing is mostly based on thermal and piezo-actuation, allowing for densely packed nozzles in inkjet printers. However, the droplet diameter is typically defined by the nozzle diameter, thus limiting the range of viscosity that can be jetted to 10-100 mPa.s to prevent nozzle clogging. Here, we present a laser-assisted system for the delivery of micro-droplets of highly viscous fluids with sub-nozzle resolution. Highly focused supersonic jets have recently been demonstrated by focusing a nanosecond pulse of light into a micro-capillary filled with dyed water, hence generating a cavitation bubble. The consequent pressure wave impact on the concave free surface of the liquid generated flow-focused micro-jets. We implemented this technique for the production of low velocity micro-droplets with photopolymer inks of increasing viscosity (0.6-148 mPa.s) into a 300 μm-wide glass capillary using low laser energies (3-70 μJ). Time-resolved imaging provided details on the droplet generation. Single micro-droplets of diameter 70-80 μm were produced on demand with inks of viscosity 0.6-9 mPa.s with good controllability and reproducibility, thus enabling to print two-dimensional patterns with a precision of 13 μm. Furthermore, the primary droplet produced with the most viscous fluid was about 66% of the capillary diameter. Preliminary results also showed that the process is linearly scalable to narrower capillaries (100-200 μm), thus paving the way for a compact laser-assisted inkjet printer. A possible application of the device would be additive manufacturing as the printed patterns could be consequently cured.","PeriodicalId":314691,"journal":{"name":"SPIE LASE","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122649329","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: 3

Potential for GPC-based laser direct writing 基于gpc的激光直写的潜力

SPIE LASE Pub Date : 2016-04-06 DOI: 10.1117/12.2217573

A. Bañas, J. Glückstad

引用次数: 0

Improving accuracy of overhanging structures for selective laser melting through reliability characterization of single track formation on thick powder beds 通过对厚粉层单轨成形的可靠性表征，提高选择性激光熔化悬垂结构的精度

SPIE LASE Pub Date : 2016-04-06 DOI: 10.1117/12.2212621

S. Mohanty, J. Hattel

{"title":"Improving accuracy of overhanging structures for selective laser melting through reliability characterization of single track formation on thick powder beds","authors":"S. Mohanty, J. Hattel","doi":"10.1117/12.2212621","DOIUrl":"https://doi.org/10.1117/12.2212621","url":null,"abstract":"Repeatability and reproducibility of parts produced by selective laser melting is a standing issue, and coupled with a lack of standardized quality control presents a major hindrance towards maturing of selective laser melting as an industrial scale process. Consequently, numerical process modelling has been adopted towards improving the predictability of the outputs from the selective laser melting process. Establishing the reliability of the process, however, is still a challenge, especially in components having overhanging structures. In this paper, a systematic approach towards establishing reliability of overhanging structure production by selective laser melting has been adopted. A calibrated, fast, multiscale thermal model is used to simulate the single track formation on a thick powder bed. Single tracks are manufactured on a thick powder bed using same processing parameters, but at different locations in a powder bed and in different laser scanning directions. The difference in melt track widths and depths captures the effect of changes in incident beam power distribution due to location and processing direction. The experimental results are used in combination with numerical model, and subjected to uncertainty and reliability analysis. Cumulative probability distribution functions obtained for melt track widths and depths are found to be coherent with observed experimental values. The technique is subsequently extended for reliability characterization of single layers produced on a thick powder bed without support structures, by determining cumulative probability distribution functions for average layer thickness, sample density and thermal homogeneity.","PeriodicalId":314691,"journal":{"name":"SPIE LASE","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117298294","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: 7