Publications
203 results found
Woodward RI, Kelleher EJR, Runcorn TH, et al., 2019, Nanosecond to picosecond fiber bragg grating compression of giant-chirped pulses from an ultra-long mode-locked fiber laser
Runcorn TH, Murray RT, Kelleher EJR, et al., 2019, Watt-level, Duration-tunable Picosecond Source at 560 nm by Second-harmonic Generation of a Raman Fiber Laser
Zolotovskii IO, Lapin VA, Sementsov D, et al., 2018, Generation of high frequency trains of chirped soliton-like pulses in inhomogeneous and cascaded active fiber configurations, OPTICS COMMUNICATIONS, Vol: 426, Pages: 333-340, ISSN: 0030-4018
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- Citations: 2
Runcorn TH, Murray RT, Kelleher EJR, et al., 2015, Duration-tunable picosecond source at 560 nm with watt-level average power, Optics Letters, Vol: 40, Pages: 3085-3088, ISSN: 0146-9592
A pulse source at 560 nm that is tunable in duration between 50 ps and 2.7 ns with >1 W of average power and near diffraction-limited beam quality is demonstrated. The source is based on efficient (up to 50%) second-harmonic generation in a periodically poled lithium tantalate crystal of a linearly polarized fiber-integrated Raman amplifier operating at 1120 nm. A duration-tunable ytterbium master-oscillator power-fiber amplifier is used to pulse-pump the Raman amplifier, which is seeded by a continuous-wave distributed-feedback laser diode at 1120 nm. The performance of the system using two different master oscillator schemes is compared. A pulse energy of up to 765 nJ is achieved with a conversion efficiency of 25% from the ytterbium fiber pump, demonstrating a compact and turn-key architecture for obtaining high peak-power radiation at 560 nm.
Runcorn T, Legg T, murray RT, et al., 2015, Fiber-integrated frequency-doubling of a picosecond Raman laser to 560 nm, Optics Express, Vol: 23, Pages: 15728-15733, ISSN: 1094-4087
We report the development of a fiber-integrated picosecond source at 560 nm by second harmonic generation of a Raman fiber laser. A picosecond ytterbium master oscillator power fiber amplifier is used to pulse-pump a Raman amplifier, which is seeded by a continuous wave distributed feedback laser diode operating at 1120 nm. The pulse train generated at 1120 nm is frequency-doubled in a fiber-coupled periodically-poled lithium niobate crystal module, producing 450 mW of average power at 560 nm with a pulse duration of 150 ps at a repetition rate of 47.5 MHz. The near diffraction-limited (M2 = 1.02) collimated output beam is ideal for super-resolution microscopy applications.
Zhang M, Howe RCT, Woodward RI, et al., 2015, Solution processed MoS2-PVA composite for sub-bandgap mode-locking of a wideband tunable ultrafast Er:fiber laser, Nano Research, Vol: 8, Pages: 1522-1534, ISSN: 1998-0000
We fabricate a free-standing few-layer molybdenum disulfide (MoS2)-polymer composite by liquid phase exfoliation of chemically pristine MoS2 crystals and use this to demonstrate a wideband tunable, ultrafast mode-locked fiber laser. Stable, picosecond pulses, tunable from 1,535 nm to 1,565 nm, are generated, corresponding to photon energies below the MoS2 material bandgap. These results contribute to the growing body of work studying the nonlinear optical properties of transition metal dichalcogenides that present new opportunities for ultrafast photonic applications.
Woodward, Kelleher EJR, Runcorn TH, et al., 2015, Fiber grating compression of giant-chirped nanosecond pulses from an ultra-long nanotube mode-locked fiber laser, Optics Letters, Vol: 40, Pages: 387-390, ISSN: 1539-4794
We demonstrate that the giant chirp of coherent, nanosecond pulses generated in an 846 m long, all-normal dispersion, nanotube mode-locked fiber laser can be compensated using a chirped fiber Bragg grating compressor. Linear compression to 11 ps is reported, corresponding to an extreme compression factor of ∼100. Experimental results are supported by numerical modeling, which is also used to probe the limits of this technique. Our results unequivocally conclude that ultra-long cavity fiber lasers can support stable dissipative soliton attractors and highlight the design simplicity for pulse-energy scaling through cavity elongation.
Legg T, Robertson A, Eckardt R, et al., 2015, Fiber-Integrated Second Harmonic Generation Modules for Visible and Near-Visible Picosecond Pulse Generation, Conference on Nonlinear Frequency Generation and Conversion - Materials, Devices, and Applications XIV, Publisher: SPIE-INT SOC OPTICAL ENGINEERING, ISSN: 0277-786X
Woodward RI, Kelleher EJR, Howe RCT, et al., 2014, Tunable Q-switched fiber laser based on saturable edge-state absorption in few-layer molybdenum disulfide (MoS₂), Opt Express, Vol: 22, Pages: 31113-31122, ISSN: 1094-4087
We fabricate a few-layer molybdenum disulfide (MoS₂) polymer composite saturable absorber by liquid-phase exfoliation, and use this to passively Q-switch an ytterbium-doped fiber laser, tunable from 1030 to 1070 nm. Self-starting Q-switching generates 2.88 μs pulses at 74 kHz repetition rate, with over 100 nJ pulse energy. We propose a mechanism, based on edge states within the bandgap, responsible for the wideband nonlinear optical absorption exhibited by our few-layer MoS₂ sample, despite operating at photon energies lower than the material bandgap.
Hu DJJ, Murray RT, Legg T, et al., 2014, Fiber-integrated 780 nm source for visible parametric generation, OPTICS EXPRESS, Vol: 22, Pages: 29726-+, ISSN: 1094-4087
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- Citations: 7
Zhang M, Kelleher EJR, Popov SV, et al., 2014, Ultrafast fibre laser sources: Examples of recent developments, OPTICAL FIBER TECHNOLOGY, Vol: 20, Pages: 666-677, ISSN: 1068-5200
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- Citations: 17
Woodward RI, Kelleher EJR, Popa D, et al., 2014, Scalar Nanosecond Pulse Generation in a Nanotube Mode-Locked Environmentally Stable Fiber Laser, IEEE PHOTONICS TECHNOLOGY LETTERS, Vol: 26, Pages: 1672-1675, ISSN: 1041-1135
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- Citations: 24
Woodward RI, Kelleher EJR, Runcorn TH, et al., 2014, Nanosecond to picosecond fiber bragg grating compression of giant-chirped pulses from an ultra-long mode-locked fiber laser
Runcorn TH, Murray RT, Kelleher EJR, et al., 2014, Watt-level, duration-tunable picosecond source at 560 nm by second-harmonic generation of a raman fiber laser
Woodward RI, Kelleher EJR, Popov SV, et al., 2014, Stimulated Brillouin scattering of visible light in small-core photonic crystal fibers, OPTICS LETTERS, Vol: 39, Pages: 2330-2333, ISSN: 0146-9592
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- Citations: 18
Woodward RI, Kelleher EJR, Popov SV, et al., 2014, Visible light stimulated brillouin scattering in small-core photonic crystal fibers
A reduced stimulated Brillouin scattering threshold power in small-core PCFs is achieved using visible wavelength excitation. We explain this in the context of acousto-optic interactions at length-scales relative to the fiber geometry.
Zhang M, Kelleher EJR, Runcorn TH, et 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.
Woodward RI, Kelleher EJR, Runcorn TH, et 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.
Woodward RI, Kelleher EJR, Runcorn TH, et al., 2014, Nanotube mode-locked, low repetition rate pulse source for fiber-based supercontinuum generation at low average pump power, Conference on Lasers and Electro-Optics (CLEO), Publisher: IEEE, ISSN: 2160-9020
Woodward RI, Kelleher EJR, Popov SV, et al., 2014, Visible Light Stimulated Brillouin Scattering in Small-Core Photonic Crystal Fibers, Conference on Lasers and Electro-Optics (CLEO), Publisher: IEEE, ISSN: 2160-9020
Murray RT, Kelleher EJR, Popov SV, et al., 2013, Compact and broadly tunable near-visible parametric wavelength converter based on polarization-maintaining photonic-crystal fiber
We report a PM-PCF based near-visible parametric wavelength converter, pumped by a diode-seeded master-oscillator power amplifier. The system is broadly tunable in wavelength (740-810 nm), pulse duration (0.3-2 ns) and repetition rate (1-30 MHz). © 2013 Optical Society of America.
Zhang M, Kelleher EJR, Runcorn TH, et al., 2013, 2 to 3 μm Raman-soliton continuum enabled by a nanotube mode-locked Tm-doped MOPFA
We demonstrate a Raman-soliton continuum extending from 2 to 3 μm, in a highly germanium-doped silica-clad fiber, pumped by a nanotube mode-locked thulium-doped fiber system delivering 12 kW sub-picosecond pulses at 1.95 μm. © OSA 2013.
Zhang M, Kelleher EJR, Runcorn TH, et al., 2013, Mid-infrared Raman-soliton continuum pumped by a nanotube-mode-locked sub-picosecond Tm-doped MOPFA, OPTICS EXPRESS, Vol: 21, Pages: 23261-23271, ISSN: 1094-4087
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- Citations: 70
Murray RT, Kelleher EJR, Popov SV, et al., 2013, Widely tunable polarization maintaining photonic crystal fiber based parametric wavelength conversion, OPTICS EXPRESS, Vol: 21, Pages: 15826-15833, ISSN: 1094-4087
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- Citations: 18
Zhang M, Kelleher EJR, Popov SV, et al., 2013, Characterization of nonlinear saturation and mode-locking potential of ionically-doped colored glass filter for short-pulse fiber lasers, OPTICS EXPRESS, Vol: 21, Pages: 12562-12569, ISSN: 1094-4087
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- Citations: 4
Chapman BH, Doronkin AV, Stone JM, et al., 2013, Femtosecond pulses at 20 GHz repetition rate through spectral masking of a phase modulated signal and nonlinear pulse compression, OPTICS EXPRESS, Vol: 21, Pages: 5671-5676, ISSN: 1094-4087
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- Citations: 10
Castellani CES, Kelleher EJR, Popa D, et al., 2013, CW-pumped short pulsed 1.12 μm Raman laser using carbon nanotubes, LASER PHYSICS LETTERS, Vol: 10, ISSN: 1612-2011
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- Citations: 25
Zhang M, Kelleher EJR, Runcorn TH, et al., 2013, 2 to 3 μm Raman-soliton continuum enabled by a nanotube mode-locked Tm-doped MOPFA, Conference on Lasers and Electro-Optics (CLEO), Publisher: IEEE, ISSN: 2160-9020
Murray RT, Kelleher EJR, Popov SV, et al., 2013, Compact and broadly tunable near-visible parametric wavelength converter based on polarization-maintaining photonic-crystal fiber, Conference on Lasers and Electro-Optics (CLEO), Publisher: IEEE, ISSN: 2160-9020
Castellani CES, Kelleher EJR, Popa D, et al., 2012, Mode-locking by nanotubes of a Raman laser based on a highly doped GeO <inf>2</inf> fiber
A mode-locked Raman laser, using 25 m of a GeO2 doped fiber as the gain medium, is reported employing carbon nanotubes. The oscillator generates 850 ps chirped pulses, which are externally compressed to 185 ps. © 2012 OSA.
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