Hua Tan, a lecturer of Hunan Institute of Science and Technology, Yueyang 414000, China. Also a PHD student of Central South University, Changsha 410083, China. Her research area is ultrafast laser micro-machining, especially femtosecond laser micro-welding. She has once been to College of Mechanical Engineering, Purdue University as a visiting scholar, engaging in the project of femtosecond laser glass welding from March 2014 to March 2015, which was supported by China Scholarship Council.