1. Department of Electrical and Electronic Engineering, Faculty of Engineering and Center for Optical Research and Education (CORE), Utsunomiya University, Yoto 7-1-2, Utsunomiya, Tochigi 321-8585, Japan
2. Department of Electrical Engineering, Nagaoka University of Technology, Nagaoka, Niigata 940-2188, Japan
3. HiLASE Centre, Institute of Physics CAS, Za radnicí 828, 252 41 Dolní Břežany, Czech Republic
4. Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1, Katahira, Aoba-ku, Sendai 980-8577, Japan
5. School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
6. School of Physics, University College Dublin, Belfield, Dublin 4, Ireland
7. Institute for Laser Technology, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan