Do-Chang Ahn

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About

Do-Chang Ahn is a leading figure in laser materials processing, with a primary focus on the real-time monitoring and control of laser welding dynamics. His most influential work, "Coaxial monitoring of keyhole during Yb:YAG laser welding" (2012), which has garnered 80 citations, established a foundational method for observing the keyhole—a critical vapor cavity that governs weld quality and stability. By developing a coaxial imaging system, Ahn enabled direct, in-process visualization of keyhole behavior, providing unprecedented insight into melt pool dynamics and defect formation. This contribution has been instrumental in advancing closed-loop control systems for high-precision industrial laser welding, directly impacting manufacturing sectors such as automotive and aerospace. Beyond this seminal paper, Ahn’s research portfolio spans laser-material interactions, process optimization, and sensor integration, consistently bridging fundamental physics with practical engineering solutions. His work is widely cited by both academic researchers and industrial engineers, reflecting its dual impact on scientific understanding and technological application. Ahn remains an active contributor to the field, with his monitoring techniques serving as a benchmark for subsequent studies in intelligent laser manufacturing.