K.-E. Peiponen: Professor of optical material research from 1993 in the Department of Physics and Mathematics in University of Joensuu Professor of optical materials research from 1.1.2010 in Department of Physics and Mathematics in University of Eastern Finland A. Zeitler: -University Lecturer, Department of Chemical Engineering and Biotechnology, University of Cambridge, UK, Research Fellow, Gonville and Caius College, Cambridge, UK, Group leader of the Terahertz Applications Group, Department of Chemical Engineering and Biotechnology, Cambridge, UK M. Kuwata-Gonokami: 1998-present: Prof., Graduate school of Engineering, The Univ. of Tokyo 2010-present: Prof., Department of Physics, The Univ. of Tokyo 2001-2008: Director, Quantum-Phase Electronics Center, School of Engineering, The Univ. of Tokyo 2005-2007: Executive Advisor for the University President, The Univ. of Tokyo 2008-present: Director, Photon Science Center, The Univ. of Tokyo 1997-2002: Director, Cooperative Excitation Project, ERATO (JST) 1993, 1994: Consultant, AT&T Bell Laboratories, Murray Hill 1997-present: Adjunct Professor, College of Optical Sciences, The University of Arizona