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  • Conference paper
    Sun Z, Lin XC, Popa D, Yu HJ, Hasan T, Torrisi F, Kelleher EJR, Zhang L, Sun L, Guo L, Hou W, Li JM, Taylor JR, Ferrari ACet al., 2011,

    Wideband tunable, high-power, graphene mode-locked ultrafast lasers

    , Optics InfoBase Conference Papers, ISSN: 2162-2701
  • Conference paper
    Hasan T, Sun Z, Popa D, Kelleher EJR, Bonaccorso F, Flahaut E, Torrisi F, Trushkevych O, Privitera G, Nicolosi V, Taylor JR, Ferrari ACet al., 2011,

    Broadband ultrafast pulse generation with double wall carbon nanotubes

    , Optics InfoBase Conference Papers, ISSN: 2162-2701
  • Journal article
    Popa D, Sun Z, Torrisi F, Hasan T, Wang F, Ferrari ACet al., 2011,

    Ultrafast and high-energy pulsed lasers with graphene mode-lockers

    , Optics InfoBase Conference Papers, ISSN: 2162-2701
  • Journal article
    Popa D, Sun Z, Hasan T, Torrisi F, Wang F, Ferrari ACet al., 2011,

    Sub-100fs pulse generation from a fiber oscillator mode-locked by nanotubes

    , Optics InfoBase Conference Papers, ISSN: 2162-2701

    We report an ultrafast fiber laser based on carbon nanotube saturable absorber. 84 fs pulses are generated directly from the fiber oscillator with 61.2 nm spectral width. © 2011 Optical Society of America.

  • Journal article
    Sun Z, Lin XC, Yu HJ, Hasan T, Torrisi F, Zhang L, Sun L, Guo L, Hou W, Li JM, Ferrari ACet al., 2011,

    High-power ultrafast solid-state laser using graphene based saturable absorber

    , Optics InfoBase Conference Papers, ISSN: 2162-2701

    We demonstrate a graphene based saturable absorber mode-locked Nd:YVO4 solid-state laser, generating ~14nJ pulses with ~1W average output power. This shows the potential for high-power pulse generation. © 2011 Optical Society of America.

  • Journal article
    Sun Z, Lin XC, Yu HJ, Hasan T, Torrisi F, Zhang L, Sun L, Guo L, Hou W, Li JM, Ferrari ACet al., 2011,

    High-power ultrafast solid-state laser using graphene based saturable absorber

    , Optics InfoBase Conference Papers, ISSN: 2162-2701

    We demonstrate a graphene based saturable absorber mode-locked Nd:YVO4 solid-state laser, generating ~14nJ pulses with ~1W average output power. This shows the potential for high-power pulse generation. © 2011 Optical Society of America.

  • Journal article
    Sun Z, Lin XC, Yu HJ, Hasan T, Torrisi F, Zhang L, Sun L, Guo L, Hou W, Li JM, Ferrari ACet al., 2011,

    High-power ultrafast solid-state laser using graphene based saturable absorber

    , Optics InfoBase Conference Papers, ISSN: 2162-2701

    We demonstrate a graphene based saturable absorber mode-locked Nd:YVO4solid-state laser, generating ~14nJ pulses with ~1W average output power. This shows the potential for high-power pulse generation. © 2011 Optical Society of America.

  • Conference paper
    Sun Z, Lin XC, Popa D, Yu HJ, Hasan T, Torrisi F, Kelleher EJR, Zhang L, Sun L, Guo L, Hou W, Li JM, Taylor JR, Ferrari ACet al., 2011,

    Wideband tunable, high-power, graphene mode-locked ultrafast lasers

    , 2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference, CLEO EUROPE/EQEC 2011

    Ultrafast passively mode-locked lasers with spectral tuning capability and high output power have widespread applications in biomedical research, spectroscopy and telecommunications [1,2]. Currently, the dominant technology is based on semiconductor saturable absorber mirrors (SESAMs) [2,3]. However, these typically have a narrow tuning range, and require complex fabrication and packaging [2,3]. A simple, cost-effective alternative is to use Single Wall Carbon Nanotubes (SWNTs) [4,10] and Graphene [10,14]. Wide-band operation is possible using SWNTs with a wide diameter distribution [5,10]. However, SWNTs not in resonance are not used and may contribute to unwanted insertion losses [10]. The linear dispersion of the Dirac electrons in graphene offers an ideal solution for wideband ultrafast pulse generation [10,15]. © 2011 IEEE.

  • Conference paper
    Hasan T, Sun Z, Popa D, Kelleher EJR, Bonaccorso F, Flahaut E, Torrisi F, Trushkevych O, Privitera G, Nicolosi V, Taylor JR, Ferrari ACet al., 2011,

    Broadband ultrafast pulse generation with double wall carbon nanotubes

    , 2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference, CLEO EUROPE/EQEC 2011

    Materials with nonlinear optical properties are much sought after for ultrafast photonic applications. Mode-locked lasers can generate ultrafast pulses using saturable absorbers[1]. Currently, the dominant technology is based on semiconductor saturable absorber mirrors (SESAMs). However, narrow tuning range (tens of nm), complex fabrication and packaging limit their applications[2]. Single wall nanotubes (SWNTs) and graphene offer simpler and cost-effective solutions[1]. Broadband operation can be achieved in SWNTs using a distribution of tube diameters[1,3], or by using graphene[4-8], due to the gapless linear dispersion of Dirac electrons[8,9]. © 2011 IEEE.

  • Journal article
    Popa D, Sun Z, Hasan T, Torrisi F, Wang F, Ferrari ACet al., 2011,

    Graphene Q-switched, tunable fiber laser

    , APPL PHYS LETT, Vol: 98, ISSN: 0003-6951
  • Journal article
    Sun Z, Lin XC, Yu HJ, Hasan T, Torrisi F, Zhang L, Sun L, Guo L, Hou W, Li JMet al., 2011,

    High-power Ultrafast Solid-state Laser Using Graphene Based Saturable Absorber

    , 2011 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
  • Journal article
    Popa D, Sun Z, Hasan T, Torrisi F, Wang F, Ferrari ACet al., 2011,

    Sub-100fs pulse generation from a fiber oscillator mode-locked by nanotubes

    , 2011 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
  • Book
    Wang F, Popa D, Sun Z, Hasan T, Torrisi F, Ferrari ACet al., 2010,

    Characterization of dynamic nonlinear absorption of carbon nanotube saturable absorber

    , ISBN: 9781557528896

    Dynamic nonlinear absorption of composite-type single-wall carbon nanotube saturable absorbers is characterized using both femtosecond and picosecond pump pulses. Results are compared with numerical simulations based on two commonly used saturable absorber models. © 2010 Optical Society of America.

  • Book
    Sun Z, Hasan T, Popa D, Torrisi F, Wang F, Bonaccorso F, Ferrari ACet al., 2010,

    Ultrafast fiber laser mode-locked by graphene based saturable absorber

    , ISBN: 9781557528896

    A Graphene-based saturable absorber is fabricated using wet chemistry techniques. We use it to passively mode-lock an Erbium doped fiber laser. ~500fs pulses are produced at 1560nm with a 5.2nm spectrum bandwidth. © 2010 Optical Society of America.

  • Conference paper
    Popa D, Sun Z, Torrisi F, Hasan T, Wang F, Ferrari ACet al., 2010,

    Generation of 63-nJ pulses from a fiber oscillator modelocked by nanotubes

    , ISSN: 2162-2701

    We mode-lock a fiber oscillator with cavity length of ~1500m using nanotubes, achieving 1.55ps pulses with pulse energy up to 63nJ at 134 KHz repetition rate. © 2010 Optical Society of America.

  • Conference paper
    Hasan T, Torrisi F, Sun Z, Popa D, Nicolosi V, Privitera G, Bonaccorso F, Ferrari ACet al., 2010,

    Solution-phase exfoliation of graphite for ultrafast photonics

    , Pages: 2953-2957, ISSN: 0370-1972
  • Journal article
    Popa D, Sun Z, Torrisi F, Hasan T, Wang F, Ferrari ACet al., 2010,

    Sub 200 fs pulse generation from a graphene mode-locked fiber laser

    , APPL PHYS LETT, Vol: 97, ISSN: 0003-6951
  • Journal article
    Sun ZP, Popa D, Hasan T, Torrisi F, Wang FQ, Kelleher EJR, Travers JC, Nicolosi V, Ferrari ACet al., 2010,

    A stable, wideband tunable, near transform-limited, graphene-mode-locked, ultrafast laser

    , NANO RES, Vol: 3, Pages: 653-660, ISSN: 1998-0124
  • Journal article
    Sun Z, Hasan T, Torrisi F, Popa D, Privitera G, Wang F, Bonaccorso F, Basko DM, Ferrari ACet al., 2010,

    Graphene mode-locked ultrafast laser.

    , ACS Nano, Vol: 4, Pages: 803-810, ISSN: 1936-086X

    Graphene is at the center of a significant research effort. Near-ballistic transport at room temperature and high mobility make it a potential material for nanoelectronics. Its electronic and mechanical properties are also ideal for micro- and nanomechanical systems, thin-film transistors, and transparent and conductive composites and electrodes. Here we exploit the optoelectronic properties of graphene to realize an ultrafast laser. A graphene-polymer composite is fabricated using wet-chemistry techniques. Pauli blocking following intense illumination results in saturable absorption, independent of wavelength. This is used to passively mode-lock an erbium-doped fiber laser working at 1559 nm, with a 5.24 nm spectral bandwidth and approximately 460 fs pulse duration, paving the way to graphene-based photonics.

  • Conference paper
    Popa D, Sun Z, Torrisi F, Hasan T, Wang F, Ferrari ACet al., 2010,

    Generation of 63-nJ pulses from a fiber oscillator mode-locked by nanotubes

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