Publications
577 results found
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
- Author Web Link
- Cite
- 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
- Author Web Link
- Cite
- 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
- Author Web Link
- Cite
- 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
- Author Web Link
- Cite
- 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.
Zhang M, Kelleher EJR, Torrisi F, et 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.
Murray RT, Kelleher EJR, Popov SV, et al., 2012, Synchronously pumped photonic crystal fiber-based optical parametric oscillator, OPTICS LETTERS, Vol: 37, Pages: 3156-3158, ISSN: 0146-9592
- Author Web Link
- Cite
- Citations: 13
Chapman BH, Doronkin AV, Popov SV, et al., 2012, All-fiber integrated 10 GHz repetition rate femtosecond laser source based on Raman compression of pulses generated through spectral masking of a phase-modulated diode, OPTICS LETTERS, Vol: 37, Pages: 3099-3101, ISSN: 0146-9592
- Author Web Link
- Cite
- Citations: 10
Pedersen MEV, Kelleher EJR, Travers JC, et al., 2012, Stable Gain-Guided Soliton Propagation in a Polarized Yb-Doped Mode-Locked Fiber Laser, IEEE PHOTONICS JOURNAL, Vol: 4, Pages: 1058-1064, ISSN: 1943-0655
- Author Web Link
- Cite
- Citations: 4
Kelleher EJR, Travers JC, Popov SV, et al., 2012, Role of pump coherence in the evolution of continuous-wave supercontinuum generation initiated by modulation instability, JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, Vol: 29, Pages: 502-512, ISSN: 0740-3224
- Author Web Link
- Cite
- Citations: 22
Castellani CES, Kelleher EJR, Luo Z, et al., 2012, Harmonic and single pulse operation of a Raman laser using graphene, LASER PHYSICS LETTERS, Vol: 9, Pages: 223-228, ISSN: 1612-2011
- Author Web Link
- Cite
- Citations: 30
Castellani CES, Kelleher EJR, Popa D, et al., 2012, Mode-locking by nanotubes of a Raman laser based on a highly doped GeO<sub>2</sub> fiber, Conference on Lasers and Electro-Optics (CLEO), Publisher: IEEE, ISSN: 2160-9020
- Author Web Link
- Cite
- Citations: 1
Castellani CES, Kelleher EJR, Popa D, et al., 2011, Nanotube-based passively mode-locked ytterbium-pumped Raman laser
Kelleher EJR, Travers JC, Popov SV, et al., 2011, The effect of pump coherence on the efficient generation of CW pumped supercontinuum
We present experimental results on the effect of pump bandwidth on the efficiency of generation of continuous-wave supercontinua. We show that the broadest supercontinuum is obtained for intermediate pump bandwidths in agreement with numerical modeling. © 2010 Optical Society of America.
Sun Z, Lin XC, Popa D, et al., 2011, Wideband tunable, high-power, graphene mode-locked ultrafast lasers, Optics InfoBase Conference Papers, ISSN: 2162-2701
Hasan T, Sun Z, Popa D, et al., 2011, Broadband ultrafast pulse generation with double wall carbon nanotubes, Optics InfoBase Conference Papers, ISSN: 2162-2701
Castellani CES, Kelleher EJR, Travers JC, et al., 2011, Nanotube-based passively mode-locked Raman laser
We demonstrate passive mode-locking of a Raman fiber laser using a nanotube-based saturable absorber. The normal dispersion cavity generates highly-chirped 500 ps pulses that are compressed down to 2 ps, with 1.4 kW peak power. © OSA/ CLEO 2011.
Castellani CES, Kelleher EJR, Travers JC, et al., 2011, Ultrafast Raman laser mode-locked by nanotubes, OPTICS LETTERS, Vol: 36, Pages: 3996-3998, ISSN: 0146-9592
- Author Web Link
- Cite
- Citations: 63
Zhang M, Kelleher EJR, Pozharov AS, et al., 2011, Passive synchronization of all-fiber lasers through a common saturable absorber, OPTICS LETTERS, Vol: 36, Pages: 3984-3986, ISSN: 0146-9592
- Author Web Link
- Cite
- Citations: 63
Chapman BH, Kelleher EJR, Popov SV, et al., 2011, Picosecond bismuth-doped fiber MOPFA for frequency conversion, OPTICS LETTERS, Vol: 36, Pages: 3792-3794, ISSN: 0146-9592
- Author Web Link
- Cite
- Citations: 10
Zhang M, Kelleher EJR, Obraztsova ED, et al., 2011, Nanosecond Pulse Generation in Lumped Normally Dispersive All-Fiber Mode-Locked Laser, IEEE PHOTONICS TECHNOLOGY LETTERS, Vol: 23, Pages: 1379-1381, ISSN: 1041-1135
- Author Web Link
- Cite
- Citations: 7
Castellani CES, Kelleher EJR, Popa D, et al., 2011, Nanotube-based passively mode-locked Ytterbium-pumped Raman laser
Over the past decades mode-locked fibre lasers have been extensively refined and developed, with most research efforts focussing on employing rare-earth doped fibres as the active elements [1]. This presents the problem that operation is limited to regions of the spectrum where such elements exhibit gain [1]. Raman amplification in silica fibre is an attractive way to overcome this spectral limitation, with gain available across the entire transparency window (300 nm - 2300 nm) [2-4]. There have been a number of reports utilising Raman gain in ultrashort pulse sources [2-4], however none using a broadband saturable absorber, such as carbon nanotubes [5-7] and graphene [7-9]. A broadband saturable absorber is an essential pre-requisite in order to fully exploit the wavelength flexibility provided by the Raman gain in short pulse mode-locked fiber lasers. © 2011 IEEE.
Sun Z, Lin XC, Popa D, et 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.
Travers JC, Kelleher EJR, Chapman BH, et al., 2011, High average power supercontinuum sources
Relatively high power supercontinuum sources were available from the mid 1980s based upon picosecond pulse pumping by Nd:YAG lasers of conventional step index fibres and utilizing soliton-Raman generation, however, it wasn't until the introduction of photonic crystal fibres (PCF) and the application of master oscillator power fibre amplifier (MOPFA) configurations that high average power supercontinuum sources became practical and subsequently, a commercial success. With the Yb-doped fibre amplifier being the most extensively developed high power fibre amplifier system the vast majority of all-fibre based supercontinuum source studies utilized pumping around 1060 nm. Consequently, PCF became indispensible as the nonlinear medium since the zero dispersion wavelength of the fibre could be accurately tailored, as well as the nonlinear coefficient, to optimize pumping in this wavelength range. Early schemes provided average powers of 2 μW and spectral power densities in the visible of 2 mW/nm. Over the past six years the average operational powers have gradually increased to 50 W. However, as a result of phase and group velocity matching criteria introduced by the necessary condition of having the zero dispersion wavelength of the nonlinear fibre in the region of the pump wavelength such that modulational instability and subsequent soliton evolution played the major role in determining supercontinuum generation, the short wavelength extent of 1060nm pumped sources only extended to about 600nm. Extension to the blue was achieved by generation in cascaded systems where PCFs with gradually decreasing zero dispersion wavelength were employed, where taken to its most extreme, single fibres with tapered profiles (manufactured at the University of Bath) were utilized. This allowed spectral extension to 320 nm and spectral power densities greater than 5 mW/nm below 400 nm. © 2011 IEEE.
Hasan T, Sun Z, Popa D, et 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.
Chapman BH, Kelleher EJR, Golant KM, et al., 2011, Amplification of picosecond pulses and gigahertz signals in bismuth-doped fiber amplifiers, OPTICS LETTERS, Vol: 36, Pages: 1446-1448, ISSN: 0146-9592
Chapman BH, Travers JC, Popov SV, et al., 2011, Non-Solitonic Extension of Supercontinua, Conference on Lasers and Electro-Optics (CLEO), Publisher: IEEE, ISSN: 2160-9020
Castellani CES, Kelleher EJR, Travers JC, et al., 2011, Nanotube-based passively mode-locked Raman laser, Conference on Lasers and Electro-Optics (CLEO), Publisher: IEEE, ISSN: 2160-9020
- Author Web Link
- Cite
- Citations: 1
This data is extracted from the Web of Science and reproduced under a licence from Thomson Reuters. You may not copy or re-distribute this data in whole or in part without the written consent of the Science business of Thomson Reuters.