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• Journal article
  Wang F, Torrisi F, Jiang Z, Popa D, Hasan T, Sun Z, Cho WB, Ferrari ACet al., 2012,

  Graphene passively Q-switched two-micron fiber lasers

  , Optics InfoBase Conference Papers, ISSN: 2162-2701

  We demonstrate a passively Q-switched thulium fiber laser, using a graphene-based saturable absorber. The laser is based on an all-fiber ring cavity and produces ~2.3 μs pulses at 1884nm, with a maximum pulse energy of 70 nJ. ©2011 Optical Society of America.

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• Journal article
  Zhang M, Kelleher EJR, Torrisi F, Sun Z, Hasan T, Popa D, Wang F, Ferrari AC, Popov SV, Taylor JRet al., 2012,

  Tm-doped fiber laser mode-locked by graphene-polymer composite.

  , Opt Express, Vol: 20, Pages: 25077-25084, ISSN: 1094-4087

  We demonstrate mode-locking of a thulium-doped fiber laser operating at 1.94 μm, using a graphene-polymer based saturable absorber. The laser outputs 3.6 ps pulses, with ~0.4 nJ energy and an amplitude fluctuation ~0.5%, at 6.46 MHz. This is a simple, low-cost, stable and convenient laser oscillator for applications where eye-safe and low-photon-energy light sources are required, such as sensing and biomedical diagnostics.

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• Journal article
  Popa D, Sun Z, Hasan T, Cho WB, Wang F, Torrisi F, Ferrari ACet al., 2012,

  74-fs nanotube-mode-locked fiber laser

  , Applied Physics Letters, Vol: 101, ISSN: 0003-6951

  We report an erbium-doped, nanotube mode-locked fiber oscillator generating 74 fs pulses with 63 nm spectral width. This all-fiber-based laser is a simple, low-cost source for time-resolved optical spectroscopy, as well as for many applications where high resolution driven by short pulse durations is required. © 2012 American Institute of Physics.

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• Journal article
  Shi Y, Hasan T, Babu NH, Torrisi F, Milana S, Ferrari AC, Cardwell DAet al., 2012,

  Synthesis of YBa2Cu3O(7-δ) and Y2BaCuO5 nanocrystalline powders for YBCO superconductors using carbon nanotube templates.

  , ACS Nano, Vol: 6, Pages: 5395-5403, ISSN: 1936-086X

  We fabricate nanosized superconducting YBa(2)Cu(3)O(7-δ) (Y-123) and nonsuperconducting Y(2)BaCuO(5) (Y-211) powders using carbon nanotubes as template. The mean particle size of Y-123 and Y-211 is 12 and 30 nm, respectively. The superconducting transition temperature of the Y-123 nanopowder is 90.9 K, similar to that of commercial, micrometer-scale powders fabricated by conventional processing. The elimination of carbon and the formation of a high purity superconducting phase both on the micro- and macroscale is confirmed by Raman spectroscopy and X-ray diffraction. We also demonstrate improvement in the superconducting properties of YBCO single grain bulk samples fabricated using the nanosize Y-211 powder, both in terms of trapped field and critical current density. The former reaches 553 mT at 77 K, with a ∼20% improvement compared to samples fabricated from commercial powders. Thus, our processing method is an effective source of pinning centers in single grain superconductors.

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• Journal article
  Torrisi F, Hasan T, Wu W, Sun Z, Lombardo A, Kulmala TS, Hsieh G-W, Jung S, Bonaccorso F, Paul PJ, Chu D, Ferrari ACet al., 2012,

  Inkjet-printed graphene electronics.

  , ACS Nano, Vol: 6, Pages: 2992-3006, ISSN: 1936-086X

  We demonstrate inkjet printing as a viable method for large-area fabrication of graphene devices. We produce a graphene-based ink by liquid phase exfoliation of graphite in N-methylpyrrolidone. We use it to print thin-film transistors, with mobilities up to ∼95 cm(2) V(-1) s(-1), as well as transparent and conductive patterns, with ∼80% transmittance and ∼30 kΩ/□ sheet resistance. This paves the way to all-printed, flexible, and transparent graphene devices on arbitrary substrates.

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• Journal article
  Going R, Popa D, Torrisi F, Sun Z, Hasan T, Wang F, Ferrari ACet al., 2012,

  500 fs wideband tunable fiber laser mode-locked by nanotubes

  , Physica E: Low-Dimensional Systems and Nanostructures, Vol: 44, Pages: 1078-1081, ISSN: 1386-9477

  Sub-picosecond tunable ultrafast lasers are important tools for many applications. Here we present an ultrafast tunable fiber laser mode-locked by a nanotube based saturable absorber. The laser outputs ∼500fs pulses over a 33 nm range at 1.5μm. This outperforms the current achievable pulse duration from tunable nanotube mode-locked lasers. © 2012 Elsevier B.V. All rights reserved.

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• Journal article
  Going R, Popa D, Torrisi F, Sun Z, Hasan T, Wang F, Ferrari ACet al., 2012,

  500 fs wideband tunable fiber laser mode-locked by nanotubes

  , Physica E: Low-Dimensional Systems and Nanostructures, Vol: 44, Pages: 1078-1081, ISSN: 1386-9477
  • Cite
• 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
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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
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• 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.

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• 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.

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• 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.

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• 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.

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• 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
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• 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.

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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

  , 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.

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• 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
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• 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)
  • Cite
• 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)
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• 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.

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