1. Institute of Light+X Science and Technology, Faculty of Electrical Engineering and Computer Science, Ningbo University, Ningbo, China
2. Prokhorov General Physics Institute of the Russian Academy of Sciences, Dianov Fiber Optics Research Center, Moscow, Russia
3. College of Optical Science and Engineering and State Key Lab of Modern Optical Instrumentation, Zhejiang University, Hangzhou, China
4. School of Materials Science and Engineering, Zhejiang University, Hangzhou, China
5. G.G. Devyatyh Institute of Chemistry of High-Purity Substances of the Russian Academy of Sciences, Nizhny Novgorod, Russia