1. Photonics Research Centre, University of Malaya, Kuala Lumpur, Malaysia
2. Department of Physics, Photonics Research Centre, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
3. Collaborative Innovation Center for Green Intelligent Laser Manufacturing Technology and Equipment of Shandong Province, School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao, China