Higher-Order Soliton Generation in Hybrid Mode-Locked Thulium-Doped Fiber Ring Laser

Abstract-A thulium-doped all-fiber laser passively modelocked by the co-action of nonlinear polarization evolution and single-walled carbon nanotubes operating at 1860-1980 nm wavelength band is demonstrated. Pumped with the single-mode laser diode at 1.55 μm laser generates near 500-fs soliton pulses at repetition rate ranging from 6.3 to 72.5 MHz in single-pulse operation regime. Having 3-m long cavity average output power reached 300 mW, giving the peak power of 4.88 kW and the pulse energy of 2.93 nJ with slope efficiency higher than 30%. At a 21.6-m long ring cavity average output power of 117 mW is obtained, corresponding to the pulse energy up to 10.87 nJ and a pulse peak power of 21.7 kW, leading to the higher-order soliton generation. Index Terms-Carbon nanotubes, fiber lasers, laser mode locking, optical pulse shaping

The art of goalkeeping: memorializing Lev Yashin

Lev Yashin remains, in the eyes of many, the greatest goalkeeper, ever to have played the game of football. Since his death in 1990, coinciding with the dying days of the Soviet Union, his legacy has played an important role in post-Soviet history, a factor that is gaining more importance as Russia prepares to host the 2018 World Cup tournament. Yashin’s memory is notably being maintained in the public perception not least through the material form of two key sculptures erected in Moscow in the late 1990s. Yet these works, part of a wider international trend to memorialize footballers in the form of public monuments, offer more than a unique insight into Yashin’s career, status and reputation. They also address concerns about the relationship between art and sport as it emerged historically in the Soviet Union and how that cultural legacy is being re-explored in a post-Soviet context. Accordingly this essay examines these two key examples of football statuary as significant case studies through which issues relating to Soviet sport, history and art can be more widely analysed

Science and technology roadmap for graphene, related two-dimensional crystals, and hybrid systems

We present the science and technology roadmap for graphene, related two-dimensional crystals, and hybrid systems, targeting an evolution in technology, that might lead to impacts and benefits reaching into most areas of society. This roadmap was developed within the framework of the European Graphene Flagship and outlines the main targets and research areas as best understood at the start of this ambitious project. We provide an overview of the key aspects of graphene and related materials (GRMs), ranging from fundamental research challenges to a variety of applications in a large number of sectors, highlighting the steps necessary to take GRMs from a state of raw potential to a point where they might revolutionize multiple industries. We also define an extensive list of acronyms in an effort to standardize the nomenclature in this emerging field