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Dynamics of molten pool evolution and highspeed real-time optical measurement in laser polishing

Light(Advanced Manufacturing) 2024年第4期5卷 110-120页

作者： Du Wang Mingjie Yu Yifan Yao Shaoyi Wang Yueyun Weng Shuang Zhao Fei Fan Keisuke Goda Sheng Liu Zongqing Zhao Cheng Lei The Institute of Technological Sciences Wuhan UniversityWuhan430072China Shenzhen Institute of Wuhan University Shenzhen518057China Laser Fusion Research Center China Academy of Engineering PhysicsMianyang621900China Department of Chemistry University of TokyoTokyo 113-0033Japan Department of Bioengineering University of CaliforniaLos AngelesCalifornia 90095United States

Laser polishing(LP)is considered an effective method for generating ultrasmooth surfaces owing to its precision,flexibility,and material ***,a lack of understanding of the evolution of surface topography during LP significantly limits the achievable surface roughness in *** this work,for the first time,by employing optical time-stretch quantitative interferometry(OTS-QI),we recorded the entire evolution of surface topography during LP with nanosecond-level temporal resolution,providing insight into the mechanisms involved in the surface roughness evolution,such as the Marangoni effect and the formation mechanism of mid-frequency waviness(MFW).Assisted by numerical calculations,we reveal that a‘perfect polishing point’exists,i.e.,the optimal interaction time for LP at a specific laser power density,at which the surface roughness can be minimised without the formation of an MFW owing to the Marangoni effect and non-uniform *** OTS-QI system harnesses the rapid repetition rate of femtosecond lasers,achieving a remarkable measurement speed exceeding 100,000,000 times per second while preserving a measurement accuracy comparable to that of existing white light interferometers(WLIs),setting a new benchmark as the fastest recorded roughness *** addition to LP,the proposed method can be applied for real-time and in situ monitoring of many machining scenarios involving highly dynamic phenomena.

关键词： Laser polishing Molten pool dynamics Ultrafast measurement Surface roughness optical timestretch quantitative interferometry

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