1. Key Laboratory of Trans-scale Laser Manufacturing Technology (Beijing University of Technology), Ministry of Education, Beijing 100124, China
2. Beijing Engineering Research Center of Laser Technology, Beijing University of Technology, Beijing 100124, China
3. Beijing Colleges and Universities Engineering Research Center of Advanced Laser Manufacturing, Beijing 100124, China
4. Institute of Laser Engineering, Faculty of Materials and Manufacturing, Beijing University of Technology, Pingleyuan 100, Chaoyang District, Beijing 100124, P. R. China