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Proceedings Paper

The influence of beam energy profile on the flight behavior of a laser-driven flyer
Author(s): Liang Wang; Wenzhi Qin; Yuan Gao; Zhihao Wang; Hongchuan Jiang; Wanli Zhang
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Paper Abstract

Various target samples were prepared by adhering 20μm thick Al foils to sapphire substrates. 0.2mm thick steel barrels with Φ0.6mm and Φ0.8mm diameter were attached to the surface of Al foils. A diffractive beam homogenizer was used to modify the laser pulse emitted from a Q-switched Nd:YAG laser. The unmodified beams presented a multi-ringed nonuniform energy profile, while numerous small energy spikes randomly distributed over the homogenized laser beam. The unmodified and homogenized beams at 80mJ were used to ablate the target samples, and the flight trajectories of Al flyers were visualized by a time-resolved shadowgraph technique. The images showed that more debris and fragments were formed at the radiation of the homogenized laser pulse, while a reverse results were obtained when barrels were employed. Moreover, the laser induced crater silhouettes presented differently in sizes and morphologies resulting from the change in the energy profiles pre- and post-homogenization. The flyer velocities were ~1300m/s regardless of the barrel parameters for unmodified laser ablation. While for homogenized lasers, the flyer velocity was up to ~1500m/s for free surface foils, and much lower velocities (~700m/s and ~1000m/s) were observed for Al foils covered with Φ0.6mm and Φ0.8mm barrel.

Paper Details

Date Published: 29 March 2019
PDF: 9 pages
Proc. SPIE 11046, Fifth International Symposium on Laser Interaction with Matter, 110462P (29 March 2019); doi: 10.1117/12.2522665
Show Author Affiliations
Liang Wang, Univ. of Electronic Science and Technology of China (China)
Institute of Chemical Materials (China)
Wenzhi Qin, Institute of Chemical Materials (China)
Yuan Gao, Institute of Chemical Materials (China)
Zhihao Wang, Institute of Chemical Materials (China)
Hongchuan Jiang, Univ. of Electronic Science and Technology of China (China)
Wanli Zhang, Univ. of Electronic Science and Technology of China (China)

Published in SPIE Proceedings Vol. 11046:
Fifth International Symposium on Laser Interaction with Matter
YiJun Zhao, Editor(s)

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