Mr. Liang Liang Profile

Liang Liang

at Nanjing Univ of Science and Technology

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Publications (2)

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Proceedings Article | 8 December 2020 Paper

Analysis of bur formation during laser-matter interaction

Tinghzhong Zhang, Liang Zhang, Chengguang Zhang, Xi Chen, Jin Li

Proceedings Volume 11606, 1160606 (2020) https://doi.org/10.1117/12.2586381

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The laser-matter interaction and bur phenomena associated with lase processing remain unclear, slowing its process development and optimization. Here, through in situ CCD imaging and mathematical model, we revealed the underlying physical mechanism of bur formation during millisecond pulsed laser processing metallic material. The result shows that the laser-induced gas/vapour jet promotes the flow of melt, and the dynamic behavior of up flow melt along the hole wall is responsible for bur formation; another more, the oxidation phenomena of metallic material have positively influence in bur diminution.

Proceedings Article | 4 May 2015 Paper

Interferometry and shadow method observation millisecond laser interaction with silicon plate

Zhang Liang, Xiaowu Ni, Jian Lu

Proceedings Volume 9543, 95430Q (2015) https://doi.org/10.1117/12.2182141

KEYWORDS: Silicon, Semiconductor lasers, Liquids, Pulsed laser operation, Laser irradiation, Charge-coupled devices, Interferometry, Laser interferometry, Laser energy, Black bodies

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Studied steam velocity and observed liquid molten splash phenomenon during the millisecond laser interaction with silicon plate. First, the interference pictures are obtained about the millisecond laser interaction with silicon plate. The energy of the laser is 7.38 J, and the pulse width is 1 ms. The thickness of silicon plate is 0.3 mm. The results show, When the laser irradiated 233 μs, the front surface of the silicon plate has been generated gasification; and When the laser irradiated 466 μs, the back surface of the silicon plate also has been generated gasification. By two pictures of fringe locations and time intervals, during the laser irradiation 233-466 μs, the steam velocity is 27.52 m/s in the front surface of the silicon plate, and during the laser irradiation 466-699 μs, the steam velocity is 20.47 m/s in the back surface of the silicon plate which are calculated. Then, the shadow pictures are obtained about the millisecond laser interaction with the same silicon plate. The results show, When the laser irradiated 466 μs, the front surface of the silicon plate has been generated molten liquid splash phenomenon; and When laser irradiated 699 μs, the back surface of the silicon plate also has been generated. Meanwhile, Laser interaction with silicon plate at later, the front and back surface of the silicon plate appears molten liquid splashing at the same time, and splashing in the direction and other issues were discussed. Finally, use blackbody radiation theory, explained the reasons for melt splashing brightness higher than the illumination lightness.

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