Semnan University Press Progress in Physics of Applied Materials 2783-4794 2 1 2022 01 01 Near the Ablation Threshold of Copper Surface Which Irradiated by 10.6 µm CO2 Laser Beam 11 14 6867 10.22075/ppam.2022.26415.1024 EN Mohammad Sadegh Riahimadvar Department of Photonics, graduate University of Advanced Technology, Kerman, Iran Mehdi Tajaldini Department of Photonics, graduate University of Advanced Technology, Kerman, Iran Journal Article 2022 02 26 In this paper, the ablation threshold of several metals has been considered by analogize the characteristics such as: fluence, specific heat of vaporization, and deposited energy. Analytically, the results showed that the threshold ablation happens when copper surface is radiated by CO₂ laser pulses. Experimental observations showed the evaporation for Al and Zn and ablation threshold on Cu as expectation. Thereby, the analytical results have been confirmed by the experimental observation, completely. Oxidation has been observed on Cu surface in phase of Cu₂O, particle sizes are around 200nm. The scanning electron microscope (SEM) image from the radiated surface clearly showed the starting point of the ablation, while the separation not happened, yet. Thus, observation could be interpreted as the ablation threshold. Notably, it could be concluded as such: first, the ablation threshold happens on the interaction of pulsed CO₂ laser with copper surface. Second, observation on mentioned threshold approves the possibility of Cu₂O nanoparticles synthesis by nanosecond CO₂ laser in free space without a reactor. https://ppam.semnan.ac.ir/article_6867_9b33232a90ee9410758da3618cc31195.pdf