Experimental study on reflection of high-intensity nanosecond Nd:YAG laser pulses in ablation of metals |
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| Affiliation: | 1. HiLASE Centre, Institute of Physics, Academy of Science of the Czech Republic, Za Radnicí 828, Dolní Břežany 25241, Czech Republic;2. Czech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering, Department of Physical Electronics, Trojanova 13, Prague 12001, Czech Republic;1. School of Physics and Electronic Electrical Engineering, Huaiyin Normal University, 111 West Chang Jiang Road, Huai''an 223300, China;2. School of Information Science & Engineering and Shandong Provincial Key Laboratory of Laser Technology and Application, Shandong University, Jinan 250100, China;3. School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China |
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| Abstract: | The total reflectivity of tin and magnesium in ablation by nanosecond Nd:YAG laser pulses in air is studied. It was found that the high initial reflectivity of the studied metals undergoes a significant drop to values of 0.11 for Sn and 0.16 for Mg within a laser fluence range between about 0.8 and 11 J/cm2. These reduced reflectivity values remain virtually unchanged with further increasing laser fluence. This study shows that a significant reflectivity decrease of the studied metals is caused by plasma formation in front of the irradiated surface. Below the plasma formation threshold, the reflectivity of the studied metals is observed to be virtually independent of laser fluence, indicating a small role of Drude׳s temperature effect on the reflectivity of the studied samples. |
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| Keywords: | Laser ablation Metals Laser materials processing Optics at surfaces Reflection |
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