Study on Laser Processing Assisted by Photosensitive Coating of Polystyrene Microgrooves

doi:10.3901/JME.260428

Abstract

Abstract: Based on a comprehensive understanding of the mechanisms involved in laser direct processing of polystyrene (PS) microgrooves, the formation principles of PS microgrooves under photosensitive coating-assisted processing are further explored. The quantitative relationship model is established to correlate processing parameters with microgroove quality for both processing methods through mathematical modeling and fitting analysis. The results indicate that near-infrared picosecond laser processing of PS microgrooves primarily occurs via the photothermal effect, wherein the laser energy induces thermal degradation of PS. Laser direct processing is likely to result in uneven energy distribution, which can lead to defects such as energy-sparse areas, pits, filamentous or dot-shaped splashes, and protrusions along the edges of microgrooves. The width of the prepared microgrooves ranges from 128 μmm to 295 μmm. In contrast, the absorption rate of laser energy can be significantly enhanced with photosensitive coating on PS surface. This improvement allows for the processing of microgrooves with minimal defects at very low single pulse energy (3 μmJ), and it eliminates noticeable spray around the microgrooves. The photosensitive coating-assisted processing method is more suitable for creating microgrooves with narrower widths and shallower depths, with microgroove width is around 47 μmm. The established relationship model can effectively predict both the microgroove width and the quality of the microgroove using two methods.

Key words: near-infrared picosecond laser, laser processing, photosensitive coating-assisted processing, polystyrene

CLC Number:

TG156

ZHANG Yue, ZHENG Lijuan, FENG Jie, JIANG Lin, GUO Ziying, GAO Botao, WANG Chengyong. Study on Laser Processing Assisted by Photosensitive Coating of Polystyrene Microgrooves[J]. Journal of Mechanical Engineering, 2026, 62(9): 361-371.

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URL: http://www.cjmenet.com.cn/EN/10.3901/JME.260428

http://www.cjmenet.com.cn/EN/Y2026/V62/I9/361

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