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• Conference paper
  Zhang M, Kelleher EJR, Runcorn TH, Popa D, Torrisi F, Ferrari AC, Popov SV, Taylor JRet al., 2014,

  Synchronously coupled fiber lasers and sum frequency generation using graphene composites

  Graphene mode-locked and self-sychronized fiber lasers are used for sum- frequency mixing in a graphene-polymer composite.

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• Conference paper
  Woodward RI, Kelleher EJR, Runcorn TH, Popov SV, Torrisi F, Howe RCT, Hasan Tet al., 2014,

  Q-switched fiber laser with MoS<inf>2</inf>saturable absorber

  © 2014 Optical Society of America. A MoS2-based saturable absorber is fabricated using wet chemistry techniques. We use it to passively Q-switch a fiber laser at 1068 nm.

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• Conference paper
  Zhang M, Kelleher EJR, Runcorn TH, Popa D, Torrisi F, Ferrari AC, Popov SV, Taylor JRet al., 2014,

  Synchronously coupled fiber lasers and sum frequency generation using graphene composites

  , Optics InfoBase Conference Papers, ISSN: 2162-2701

  Graphene mode-locked and self-sychronized fiber lasers are used for sum-frequency mixing in a graphene-polymer composite. © 2014 Optical Society of America.

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• Conference paper
  Purdie D, Popa D, Wittwer VJ, Ziang Z, Torrisi F, Ferrari ACet al., 2014,

  Sub-50 fs compressed pulses from a graphene-mode locked fiber laser

  We demonstrate a graphene mode-locked fiber laser system generating 42 fs pulses with 53 mW output power, ideal for high temporal resolution applications.

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• Journal article
  Mary R, Brown G, Beecher SJ, Thomson RR, Popa D, Sun Z, Torrisi F, Hasan T, Milana S, Bonaccorso F, Ferrari AC, Kar AKet al., 2013,

  Evanescent-wave coupled right angled buried waveguide: Applications in carbon nanotube mode-locking

  , Applied Physics Letters, Vol: 103, ISSN: 0003-6951

  We present an evanescent-field device based on a right-angled waveguide. This consists of orthogonal waveguides, with their points of intersection lying along an angled facet of the chip. Light guided along one waveguide is incident at the angled dielectric-air facet at an angle exceeding the critical angle, so that the totally internally reflected light is coupled into the second waveguide. By depositing a nanotube film on the angled surface, the chip is then used to mode-lock an Erbium doped fiber ring laser with a repetition rate of 26 MHz, and pulse duration of 800 fs. © 2013 AIP Publishing LLC.

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• Journal article
  Brown G, Thomson RR, Beecher SJ, Mary R, Popa D, Sun Z, Torrisi F, Hasan T, Milana S, Bonaccorso F, Ferrari AC, Kar AKet al., 2013,

  Mode-locking using right-angle waveguide, based nanotube saturable absorber

  , Pacific Rim Conference on Lasers and Electro-Optics, CLEO - Technical Digest

  We report passive mode-locking of an Er-doped fiber laser using carbon nanotubes deposited on the facet of a right-angle optical waveguide. © 2013 IEEE.

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• Journal article
  Mary R, Brown G, Beecher SJ, Torrisi F, Milana S, Popa D, Hasan T, Sun Z, Lidorikis E, Ohara Set al., 2013,

  1.5 GHz picosecond pulse generation from a monolithic waveguide laser with a graphene-film saturable output coupler.

  , Opt Express, Vol: 21, Pages: 7943-7950, ISSN: 1094-4087

  We fabricate a saturable absorber mirror by coating a graphene- film on an output coupler mirror. This is then used to obtain Q-switched mode-locking from a diode-pumped linear cavity channel waveguide laser inscribed in Ytterbium-doped Bismuthate Glass. The laser produces 1.06 ps pulses at ~1039 nm, with a 1.5 GHz repetition rate, 48% slope efficiency and 202 mW average output power. This performance is due to the combination of the graphene saturable absorber and the high quality optical waveguides in the laser glass.

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• Journal article
  Lagatsky AA, Sun Z, Kulmala TS, Sundaram RS, Milana S, Torrisi F, Antipov OL, Lee Y, Ahn JH, Brown CTA, Sibbett W, Ferrari ACet al., 2013,

  2 μm solid-state laser mode-locked by single-layer graphene

  , Applied Physics Letters, Vol: 102, ISSN: 0003-6951

  We report a 2 μm ultrafast solid-state Tm: Lu2O3 laser, mode-locked by single-layer graphene, generating transform-limited ∼ 410 fs pulses, with a spectral width ∼ 11.1 nm at 2067 nm. The maximum average output power is 270 mW, at a pulse repetition frequency of 110 MHz. This is a convenient high-power transform-limited ultrafast laser at 2 μm for various applications, such as laser surgery and material processing. © 2013 American Institute of Physics.

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

  Double-wall carbon nanotube Q-switched and mode-locked two-micron fiber lasers

  , 2012 Conference on Lasers and Electro-Optics, CLEO 2012

  We fabricate double-wall carbon nanotube polymer composite saturable absorbers and demonstrate stable Q-switched and Mode-locked Thulium fiber lasers in a linear cavity and a ring cavity respectively. © 2012 OSA.

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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

  , 2012 Conference on Lasers and Electro-Optics, CLEO 2012

  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. © 2012 OSA.

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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

  , CLEO: Applications and Technology, CLEO_AT 2012

  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
  Wang F, Jiang Z, Hasan T, Sun Z, Popa D, Torrisi F, Cho WB, Flahaut E, Ferrari ACet al., 2012,

  Double-wall carbon nanotube Q-switched and mode-locked two-micron fiber lasers

  , CLEO: Science and Innovations, CLEO_SI 2012

  We fabricate double-wall carbon nanotube polymer composite saturable absorbers and demonstrate stable Q-switched and Mode-locked Thulium fiber lasers in a linear cavity and a ring cavity respectively. © 2011 Optical Society of America.

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

  Dual-wavelength, carbon nanotube mode-locked fiber laser

  , 2012 IEEE Photonics Conference, IPC 2012, Pages: 505-506

  We demonstrate a dual-wavelength, carbon nanotube mode-locked Er fiber laser. The laser outputs two wavelengths at 1549nm and 1562nm, and each wavelength corresponds to pulse duration of ∼1.3ps and repetition rate of ∼11.27MHz. © 2012 IEEE.

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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.

  • Abstract
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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

  , CLEO: Applications and Technology, CLEO_AT 2012

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

  Pulsewidth switchable, wavelength tuneable ultrafast fiber laser mode-locked by carbon nanotubes

  , 2012 IEEE Photonics Conference, IPC 2012, Pages: 288-289

  Employing a nanotube-based saturable absorber, we demonstrate a continuously tunable (1533-1563nm) ultrafast fiber laser, with output pulsewidth switchable between picosecond (1.2 ps) and femtosecond (610 fs) regimes. © 2012 IEEE.

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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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