Publications
49 results found
Woodward RI, Howe RCT, Runcorn TH, et al., 2015, Wideband saturable absorption in few-layer molybdenum diselenide (MoSe₂) for Q-switching Yb-, Er- and Tm-doped fiber lasers., Opt Express, Vol: 23, Pages: 20051-20061, ISSN: 1094-4087
We fabricate a free-standing molybdenum diselenide (MoSe2) saturable absorber by embedding liquid-phase exfoliated few-layer MoSe2 flakes into a polymer film. The MoSe2-polymer composite is used to Q-switch fiber lasers based on ytterbium (Yb), erbium (Er) and thulium (Tm) gain fiber, producing trains of microsecond-duration pulses with kilohertz repetition rates at 1060 nm, 1566 nm and 1924 nm, respectively. Such operating wavelengths correspond to sub-bandgap saturable absorption in MoSe2, which is explained in the context of edge-states, building upon studies of other semiconducting transition metal dichalcogenide (TMD)-based saturable absorbers. Our work adds few-layer MoSe2 to the growing catalog of TMDs with remarkable optical properties, which offer new opportunities for photonic devices.
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.
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.
Runcorn TH, Murray RT, Kelleher EJR, et al., 2015, Watt-level, Duration-tunable Picosecond Source at 560 nm by Second-harmonic Generation of a Raman Fiber Laser
Woodward RI, Kelleher EJR, Runcorn TH, et al., 2015, Nanosecond to picosecond fiber bragg grating compression of giant-chirped pulses from an ultra-long mode-locked fiber laser
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
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
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, Runcorn TH, et al., 2014, Nanosecond to picosecond fiber bragg grating compression of giant-chirped pulses from an ultra-long mode-locked fiber laser
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, Q-switched fiber laser with MoS<inf>2</inf> saturable absorber
A MoS2-based saturable absorber is fabricated using wet chemistry techniques. We use it to passively Q-switch a fiber laser at 1068 nm. © 2014 Optical Society of America.
Zhang M, Kelleher EJR, Runcorn TH, et 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.
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
We demonstrate a nanotube mode-locked fiber laser with low repetition rate (244 kHz), enabling supercontinuum generation in photonic crystal fiber spanning 600 to 2000 nm, at a low average pump power of 87 mW. © 2014 Optical Society of America.
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
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
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
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