1. Key Laboratory of Low-grade Energy Utilization Technologies and Systems (Chongqing University), Ministry of Education, Chongqing 400030, China
2. Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400030, China
3. Institute of Laser Manufacturing, Henan Academy of Sciences, Zhengzhou 450046, P. R. China