1. University of Debrecen,Institute of Physics, Faculty of Science and Technology,Department of Experimental Physics,Debrecen,Hungary
2. Institute for Solid State Physics and Optics, Wigner Research Centre for Physics,Budapest,Hungary
3. Budapest University of Technology and Economics,Department of Electronics Technology,Budapest,Hungary
4. Laboratory for Molecular Physics and Synthesis of New Materials, Division of Materials Physics, Ruđer Bošković Institute,Zagreb,Croatia
5. University of Szeged,Department of Optics and Quantum Electronics,Szeged,Hungary
6. University of Debrecen,Institute of Physics, Faculty of Science and Technology,Department of Solid State Physics,Debrecen,Hungary