1. Institute for Optics and Quantumelectronics, Friedrich-Schiller-University Jena, Max-Wien Platz 1, D-07743 Jena, Germany, Institute of Biochemistry and Biophysics, Friedrich-Schiller-University Jena, Philosophenweg 12, D-07743 Jena, Germany, Institute of Molecular Biotechnology, Beutenbergstrasse 11, D-07745 Jena, Germany, and Institute for Laser Technology, Utsubo-Hommachi 1-8-4, Osaka 550-0004, Japan