Dr. Wenda Cui Profile

Dr. Wenda Cui

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Proceedings Article | 22 December 2022 Paper

Near-infrared/mid-infrared laser irradiation effects on polyethylene film

Minsun Chen, Hao Liu, Kai Han, Guomin Zhao, Wenda Cui, Changqing Song, Chuan Guo

Proceedings Volume 12459, 124591A (2022) https://doi.org/10.1117/12.2656321

KEYWORDS: Mid-IR, Laser irradiation, Composites, Laser damage threshold, Infrared lasers, Fiber lasers, Failure analysis, Transmittance, Absorption, Laser ablation

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Experimental researches of the near-infrared laser with 1085nm wavelength and the mid-infrared laser with 3.8 microns wavelength irradiate on the transparent polyethylene film with a thickness of about 25 microns are carried out. Results show that the burn through time approximate exponentially decreases from 5.76s to 0.85s, for the average power density of the mid-infrared laser increases from 2.9W/cm2 to 37.2W/cm², and the damage energy density is about 22.2J/cm². The polyethylene film can be burned through by near-infrared laser irradiation with an average power density of 338.8W/cm2 for 18.6s, and the corresponding damage energy density is up to 6301.7J/cm². The failure time exponentially decreases from 18.6s to 0.75s with the incident laser density increases from 338.8W/cm2 to 428.5W/cm², and the corresponding damage energy density approximate exponentially decreases from 6301.7J/cm² to 321.4J/cm². The damage of near-infrared laser has obvious threshold effect. The polyethylene film would not be burned through until the laser power density reaches a certain high value, so the damage threshold of polyethylene film by near-infrared laser is 1 ~ 2 orders of magnitude higher than that by mid-wavelength infrared laser. The results are in good agreement with the absorption ratio of polyethylene film at wavelength of 3800 nm and 1085 nm measured under weak light.

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