Thermal and mechanical damage in polyimide irradiated by pulsed CO2 laser

Jiacheng Wu; Yue Hu; Xi Wang

doi:10.1117/12.2561314

17 April 2020 Thermal and mechanical damage in polyimide irradiated by pulsed CO₂ laser

Jiacheng Wu, Yue Hu, Xi Wang

Proceedings Volume 11455, Sixth Symposium on Novel Optoelectronic Detection Technology and Applications; 114551R (2020) https://doi.org/10.1117/12.2561314
Event: Sixth Symposium on Novel Photoelectronic Detection Technology and Application, 2019, Beijing, China

Abstract

Polyimide (PI) irradiated by pulsed CO₂ laser was simulated by finite element method. The finite element model of PI damaged by pulsed CO₂ laser was established. We analyzed the temperature and stress characteristics of PI sample under laser irradiation. The effects of laser pulse width and laser spot radius on the damage effect were discussed. The simulation results show that when the stress does not reach the tensile limit,PI will have melt damage,and the body damage is prior to the surface damage. Under the same laser energy irradiation,the thermal stress produced by short pulsed laser is larger than that produced by long pulsed laser,and the effect of thermal stress damage is better. The peak value of stress decreases with the increase of laser spot radius. The larger spot radius is,the worse damage effect is. The occurrence time of peak stress is independent of spot radius.

Citation Download Citation

Jiacheng Wu, Yue Hu, and Xi Wang "Thermal and mechanical damage in polyimide irradiated by pulsed CO₂ laser", Proc. SPIE 11455, Sixth Symposium on Novel Optoelectronic Detection Technology and Applications, 114551R (17 April 2020); https://doi.org/10.1117/12.2561314

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