National Engineering Research Center for DPSSL 1 article published in JoVE Engineering Quantitative Analysis of Vacuum Induction Melting by Laser-induced Breakdown Spectroscopy Tianzhuo Zhao1,2,3, Xin Li1,2, Qixiu Zhong1,2, Hong Xiao1,3, Shuzhen Nie1,3, Fuqiang Lian1,3, Sining Sun4, Zhongwei Fan1,2,3 1The Academy of Opto-electronics, Chinese Academy of Sciences, 2University of Chinese Academy of Sciences, 3National Engineering Research Center for DPSSL, 4Beijing GK Laser Technology Co., Ltd. During vacuum induction melting, laser-induced breakdown spectroscopy is used to perform real-time quantitative analysis of the main-ingredient elements of a molten alloy.