Shockwave observation of femtosecond laser ablation on Si3N4 ceramic

Feng Tian; Mengmeng Wang

doi:10.1117/12.2602423

24 June 2021 Shockwave observation of femtosecond laser ablation on Si₃N₄ ceramic

Feng Tian, Mengmeng Wang

Proceedings Volume 11885, International Conference on Laser, Optics and Optoelectronic Technology (LOPET 2021); 118850H (2021) https://doi.org/10.1117/12.2602423
Event: 2021 International Conference on Laser, Optics and Optoelectronic Technology (LOPET 2021), 2021, Xi'an, China

Abstract

Processing the Si₃N₄ ceramic is a big challenge because of its high hardness and brittleness. Femtosecond (fs) laser is an excellent method to process the Si₃N₄ ceramic. However, the temporal evolution of the fs laser induced plasma from the initialization to the disappearance is still lacking for deeply understanding the laser-matter mechanisms. In this study, we employ the pump-probe shadowgraphy and the ultrafast plasma imaging to observe the whole shockwave evolution on Si₃N₄ ceramic. We find that the shockwave propagates in a spherical law and the velocity of shockwave decreases rapidly in the first 50 ns, and finally approaches to the speed of sound at the delay of 430 ns. The relationship between plasma melting, expansion and shockwave propagation was revealed to provide further insight into the fs laser ablation of Si₃N₄ ceramic.

Citation Download Citation

Feng Tian and Mengmeng Wang "Shockwave observation of femtosecond laser ablation on Si₃N₄ ceramic", Proc. SPIE 11885, International Conference on Laser, Optics and Optoelectronic Technology (LOPET 2021), 118850H (24 June 2021); https://doi.org/10.1117/12.2602423

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