1. Institute of Laser EngineeringOsaka University 2-6 Yamadaoka Suita Osaka 565-0875 Japan
2. Centre for Theoretical Chemistry and PhysicsSchool of Natural and Computational SciencesMassey University Albany Auckland 0632 New Zealand
3. Department of Electronic Science and EngineeringFaculty of EngineeringKyoto University Kyoto daigaku-katsura, Nishikyo-ku Kyoto 615-8530 Japan
4. Bunkoukeiki Co., Ltd 4-8, Takakura-machi Hachioji-shi Tokyo 192-0033 Japan
5. Kiyohara Optics Inc. 3-28-10 Funado Itabashi Tokyo 174-0041 Japan