M. Feinaeugle (Author), Peter Gregorčič (Author), D. J. Heath (Author), B. Mills (Author), Robert Eason (Author)

Abstract

We have studied the transfer regimes and dynamics of polymer flyers from laser-induced backward transfer (LIBT) via time-resolved shadowgraphy. Imaging of the flyer ejection phase of LIBT of 3.8 [micro]m and 6.4 [micro]m thick SU-8 polymer films on germanium and silicon carrier substrates was performed over a time delay range of 1.4- 16.4 [micro]s after arrival of the laser pulse. The experiments were carried out with 150 fs, 800 nm pulses spatially shaped using a digital micromirror device, and laser fluences of up to 3.5 J/cm2 while images were recorded via a CCD camera and a spark discharge lamp. Velocities of flyers found in the range of 6-20 m/s, and the intact and fragmented ejection regimes, were a function of donor thickness, carrier and laser fluence. The crater profile of the donor after transfer and the resulting flyer profile indicated different flyer ejection modes for Si carriers and high fluences. The results contribute to better understanding of the LIBT process, and help to determine experimental parameters for successful LIBT of intact deposits.

Keywords

laser-induced backward transfer;time-resolved shadowgraphy;femtosecond laser-induced micro-processing;polymer thin films;additive manufacturing;SU-8;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FS - Faculty of Mechanical Engineering
UDC: 535(045)
COBISS: 15103003 Link will open in a new window
ISSN: 0169-4332
Views: 2015
Downloads: 639
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Other data

Secondary language: Slovenian
Secondary keywords: lasersko povzročen prenos snovi;senčna fotografija;femtosekundni laserji;mikroprocesiranje;
Pages: str. 1231-1238
Issue: ǂVol. ǂ396
Chronology: Feb. 2017
DOI: 10.1016/j.apsusc.2016.11.120
ID: 10915005