Speaker：Dr Fengqiu Wang(Nanomaterials and Spectroscopy Group Department of Engineering, University of Cambridge 9 JJ Thomson Avenue, CB3 0FA, UK)
Time： 14:00 pm, June 23 (Thursday), 2011
Venue：Transient Building, third floor conference room

　 In 2002, the research of optical switching characteristic of carbon nano tube revealed the ultra (subpicosecond) excition decay time. Since then, the research of non-linear optical characteristics of carbon nano materials and application of mode locking is developing rapidly all over the world. Compared to the traditional saturable absorber (such as SESAMs), these new materials have advantages of short recovery time, great modulation depth, low saturation power, wide range of working wave-length, and stable chemistry and environment. In recent two years, non-saturated characteristic of graphene has been demonstrated through experiment, and has showed the characteristics of broadband absorption similar to carbon nano tube device. This report will focus on preparation and characterization of the carbon nano materials (including nano tube and graphene) and high moculer compound materials, and its application in the mode locked fiber laser. Meanwhile, it will summarize the latest development in the field of carbon nano material mode locked fiber laser. And the last will be the discussion of major technical difficulties at present, and the future development tendency of this technology.
　  Dr. Fengqiu Wang is currently a Research Associate in the Nanomaterials and Spectroscopy Group, Department of Engineering, University of Cambridge. He obtained his B.S. degree in Electronic Engineering from Peking University（北京大学）, China in 2003, before being admitted to Cambridge University. At Cambridge, Dr Fengqiu Wang worked on ultrafast fibre lasers mode-locked by novel nano carbon-based saturable absorber devices. He obtained his MPhil and PhD degree in 2005 and 2009 respectively. He also has rich experiences in nonlinear fibre optics and high-speed Optical Time-Division-Multiplexing (OTDM) communication systems. Dr Wang has published more than 20 peer-reviewed journal papers and contributed to 40 presentations at international conferences. He is also actively involved in the commercialisation of nano carbon saturable absorbers for ultrafast laser industry.