Mr. Zhipeng Liu Profile

Zhipeng Liu

at Beijing Institute of Technology

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Proceedings Article | 14 October 2022 Paper

Effect of wavelength on HAZ and processing efficiency in CFRP ablated by femtosecond laser at different wavelengths

Zhipeng Liu, Baoshan Guo

Proceedings Volume 12343, 123431V (2022) https://doi.org/10.1117/12.2648394

KEYWORDS: Femtosecond phenomena, Carbon, Laser energy, Laser optics, Fiber reinforced polymers

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As a new lightweight material, Carbon Fiber-reinforced polymer (CFRP) has been widely used in various fields, but its difficult-to-machine characteristic also severely restricts its application. In this paper, femtosecond laser with center wavelength of 400nm and 800nm was used for multi-pass scanning processing of CFRP to study the relationship between laser wavelength and processing quality and processing efficiency, and try to obtain smaller heat affected zone (HAZ). The experimental results show that when the experimental conditions are the same, the HAZ obtained by femtosecond laser processing of CFRP with the wavelength of 400 nm is about half that of the wavelength of 800 nm, and the minimum can reach 1.5μm, but the width of slit is smaller than that obtained by femtosecond laser processing with the wavelength of 800 nm. Therefore, reducing the wavelength of femtosecond laser can effectively reduce the HAZ, but at the same time, it will also reduce the processing efficiency.

Proceedings Article | 24 June 2021 Paper

High-efficient ablation of nickel through multiple scanning of femtosecond laser single pulse

Kunpeng Chu, Zhipeng Liu, Baoshan Guo

Proceedings Volume 11885, 1188506 (2021) https://doi.org/10.1117/12.2602346

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Recently, the application of femtosecond laser ablation of nickel to prepare super-hydrophobic structures in marine anticorrosion has become more and more mature, but the processing efficiency is slow, which limits its large-scale application. In this study, a method for improving the efficiency of ablating nickel through multiple scanning of femtosecond lasers single pulse is proposed. The experimental results show that when the total processing time is the same, the higher scanning speed and more scanning times will promote the increase of the groove depth formed by the ablated nickel compared with the low scanning speed. This phenomenon has been verified under three different laser fluences. Compared with 25 um/s, the ablation efficiency is increased by 42.6%, 48.2% and 55.4% when scanning speed is 200 um/s, respectively. The difference in ablation efficiency in the experiment is related to the fact that femtosecond laser ablation of nickel will change the physical and chemical properties of the bottom of the material.

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