The influence of beam energy profile on the flight behavior of a laser-driven flyer

Liang Wang; Wenzhi Qin; Yuan Gao; Zhihao Wang; Hongchuan Jiang; Wanli Zhang

doi:10.1117/12.2522665

29 March 2019 The influence of beam energy profile on the flight behavior of a laser-driven flyer

Liang Wang, Wenzhi Qin, Yuan Gao, Zhihao Wang, Hongchuan Jiang, Wanli Zhang

Proceedings Volume 11046, Fifth International Symposium on Laser Interaction with Matter; 110462P (2019) https://doi.org/10.1117/12.2522665
Event: Fifth International Symposium on Laser Interaction with Matter, 2018, Changsha, China

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.

Citation Download Citation

Liang Wang, Wenzhi Qin, Yuan Gao, Zhihao Wang, Hongchuan Jiang, and Wanli Zhang "The influence of beam energy profile on the flight behavior of a laser-driven flyer", Proc. SPIE 11046, Fifth International Symposium on Laser Interaction with Matter, 110462P (29 March 2019); https://doi.org/10.1117/12.2522665

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KEYWORDS

Aluminum

Laser ablation

Pulsed laser operation

Laser energy

Beam homogenizers

Plasma

Sapphire

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