Imaging of the ejection process of nanosecond laser-induced forward transfer of gold

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Abstract

Laser-induced forward transfer is a direct-write process suitable for high precision 3D printing of several materials. However, the driving forces related to the ejection mechanism of the donor ma-terial are still under debate. So far, most of the experimental studies of nanosecond LIFT, are based on post process analysis of either the donor layer and/or the deposits, which were transferred to the receiving substrate. To gain further insights into the ejection dynamics, this article presents results of a series of imaging experiments of the release process of nanosecond LIFT of a 200 nm thick gold donor layer. Images were obtained using a setup which consists of two dual-shutter cameras. Both cameras were combined with a 50× long-distance microscope and used to capture coaxial and side-view images of the ejection process. Bright field illumination of the scene was accomplished by a 6 ns dual-cavity laser source. For laser fluence just above the transfer threshold, the formation of a jet and the subsequent release of a single droplet was observed. The droplet diameter was esti-mated to be about 2 μm. Analysis of the coaxial images indicates the emission of a spectral broad range light which was identified as thermal radiation.
Original languageEnglish
Title of host publicationProceedings of LPM 2014
Subtitle of host publicationthe 15th International Symposium on Laser Precision Microfabrication
Place of PublicationVilnius, Lithuania
Pages129-134
Publication statusPublished - 17 Jun 2014
Event15th International Symposium on Laser Precision Microfabrication, LPM 2014 - Vilnius, Lithuania
Duration: 17 Jun 201420 Jun 2014
Conference number: 15

Conference

Conference15th International Symposium on Laser Precision Microfabrication, LPM 2014
Abbreviated titleLPM
CountryLithuania
CityVilnius
Period17/06/1420/06/14

Keywords

  • METIS-304772
  • IR-91605

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    Pohl, R., Visser, C. W., Römer, G. R. B. E., Sun, C., Huis in 't Veld, B., & Lohse, D. (2014). Imaging of the ejection process of nanosecond laser-induced forward transfer of gold. In Proceedings of LPM 2014: the 15th International Symposium on Laser Precision Microfabrication (pp. 129-134). Vilnius, Lithuania.