EMERITUS PROFESSOR GEOFF NEW

New GHC, 2017, Computing unstable resonator modes, JOURNAL OF MODERN OPTICS, Vol: 64, Pages: 2185-2194, ISSN: 0950-0340

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Stuart NH, Bigourd D, Hill RW, Robinson TS, Mecseki K, Patankar S, New GHC, Smith RAet al., 2015, Direct fluorescence characterisation of a picosecond seeded optical parametric amplifier, Optics Communications, Vol: 336, Pages: 319-325, ISSN: 0030-4018

The temporal intensity contrast of high-power lasers based on optical parametric amplification (OPA) can be limited by parametric fluorescence from the non-linear gain stages. Here we present a spectroscopic method for direct measurement of unwanted parametric fluorescence widely applicable from unseeded to fully seeded and saturated OPA operation. Our technique employs simultaneous spectroscopy of fluorescence photons slightly outside the seed bandwidth and strongly attenuated light at the seed central wavelength. To demonstrate its applicability we have characterised the performance of a two-stage picosecond OPA pre-amplifier with 2.8×105 gain, delivering pulses at 1054 nm. We show that fluorescence from a strongly seeded OPA is reduced by ~500× from the undepleted to full pump depletion regimes. We also determine the vacuum fluctuation driven noise term seeding this OPA fluorescence to be 0.7±0.4 photons ps−1 nm−1 bandwidth. The resulting shot-to-shot statistics highlights a 1.5% probability of a five-fold and 0.3% probability of a ten-fold increase of fluorescence above the average value. Finally, we show that OPA fluorescence can be limited to a few-ps pedestal with 3×10−9 temporal intensity contrast 1.3 ps ahead of an intense laser pulse, a level highly attractive for large scale chirped-pulse OPA laser systems.

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Bigourd D, Patankar S, Robbie SIO, Doyle HW, Mecseki K, Stuart N, Hadjicosti K, Leblanc N, New GHC, Smith RAet al., 2013, Spectral enhancement in optical parametric amplifiers in the saturated regime, APPLIED PHYSICS B-LASERS AND OPTICS, Vol: 113, Pages: 627-633, ISSN: 0946-2171

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• Citations: 9

New GHC, 2013, Biaxial media revisited, EUROPEAN JOURNAL OF PHYSICS, Vol: 34, Pages: 1263-1276, ISSN: 0143-0807

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• Citations: 5

New GHC, Kaddour ZD, 2012, Unstable resonator modes: a beam expansion approach, JOURNAL OF MODERN OPTICS, Vol: 59, Pages: 1363-1370, ISSN: 0950-0340

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• Citations: 5

New GHC, 2011, Nonlinear optics: the first 50 years, CONTEMPORARY PHYSICS, Vol: 52, Pages: 281-292, ISSN: 0010-7514

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• Citations: 5

New G, 2011, Introduction to Nonlinear Optics, Publisher: Cambridge Univ Pr, ISBN: 9780521877015

After basic ideas have been outlined, the book offers a thorough analysis of second harmonic generation and related second-order processes, before moving on to ...

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Musgrave I, Chekhlov O, Collier J, Clarke R, Dunne A, Hancock S, Heathcote R, Hernandez-Gomez C, Galimberti M, Lyachev A, Matousek P, Neely D, Norreys P, Ross I, Tang Y, Winstone T, New Get al., 2010, Design of the 10 PW OPCPA facility for the vulcan laser

We present the progress made in developing 10PW OPCPA facility for the Vulcan laser to produce pulses with focused intensities >1023 Wcm-2. This power level will be delivered by generating pulses with >300J in 30fs. These pulses will be delivered to two target areas: in one target area they will be combined with the existing Vulcan Petawatt beamline and a new target area will be created for high intensity interactions. © 2010 Optical Society of America.

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Musgrave I, Chekhlov O, Collier J, Clarke R, Dunne A, Hancock S, Heathcote R, Hernandez-Gomez C, Galimberti M, Lyachev A, Matousek P, Neely D, Norreys P, Ross I, Tang Y, Winstone T, New Get al., 2010, Design of the 10 PW OPCPA facility for the Vulcan laser

We present the progress made in developing IOPW OPCPA facility for the Vulcan laser to produce pulses with focused intensities >1023 Wcm-2. This power level will be delivered by generating pulses with >300J in 30fs. These pulses will be delivered to two target areas: in one target area they will be combined with the existing Vulcan Petawatt beamline and a new target area will be created for high intensity interactions. © 2010 Optical Society of America.

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• Citations: 1

Musgrave I, Chekhlov O, Collier J, Clarke R, Dunne A, Hancock S, Heathcote R, Hernandez-Gomez C, Galimberti M, Lyachev A, Matousek P, Neely D, Norreys P, Ross I, Tang Y, Winstone T, New Get al., 2010, Design of the 10 PW OPCPA Facility for the Vulcan Laser., Conference on Lasers and Electro-Optics (CLEO)/Quantum Electronics and Laser Science Conference (QELS), Publisher: IEEE

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• Citations: 1

Tang Y, Ross IN, Hernandez-Gomez C, New GHC, Musgrave I, Chekhlov OV, Matousek P, Collier JLet al., 2008, Optical parametric chirped-pulse amplification source suitable for seeding high-energy systems, Optics Letters, Vol: 33, Pages: 2386-2388

A short-pulse source based on optical parametric chirped-pulse amplification (OPCPA) technology has been developed with properties that make it a suitable seed for a high-energy OPCPA system. This source generated a diffraction-limited pulse at 910 nm with a full bandwidth of >165 nm and a spectrum having a transform-limited pulse duration <10 fs.

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Radnor SBP, Chipperfield LE, Kinsler P, New GHCet al., 2008, Carrier-wave steepened pulses and gradient-gated high-order harmonic generation, PHYSICAL REVIEW A, Vol: 77, ISSN: 1050-2947

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• Citations: 26

Radnor SBP, Chipperfield LE, Kinsler P, New GHCet al., 2008, Carrier-wave steepened pulses and gradient-gated high-order harmonic generaiton, Physical Review A, Vol: 77, Pages: 1-7

We show how to optimize the process of high-order harmonic generation (HHG) by gating the interaction using the field gradient of the driving pulse. Since maximized field gradients are efficiently generated by self-steepening processes, we first present a generalized theory of optical carrier-wave self-steepened (CSS) pulses. This goes beyond existing treatments, which only consider third-order nonlinearity, and has the advantage of describing pulses whose wave forms have a range of symmetry properties. Although a fertile field for theoretical work, CSS pulses are difficult to realize experimentally because of the deleterious effect of dispersion. We therefore consider synthesizing CSS-like profiles using a suitably phased subset of the harmonics present in a true CSS wave form. Using standard models of HHG, we show that the presence of gradient-maximized regions on the wave forms can raise the spectral cutoff and so yield shorter attosecond pulses. We study how the quality of the attosecond bursts created by spectral filtering depends on the number of harmonics included in the driving pulse.

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New GHC, Noy M, Crosse JA, Rumley A, Newson L, Chen Z-Y, Cheung C, Todhunter Aet al., 2008, Simulation of turbulence in mode-locked lasers, Optics Communications, Vol: 282, Pages: 4418-4422

We establish the connection between a paper by Kartner et al. (F.X. Kartner, D.M. Zumbuhl, N. Matuschek, Phys. Rev. Lett. 82 (1999) 4428) entitled "Turbulence in mode-locked lasers", and earlier work on the role of noise in mode-locked laser systems. We present numerical results that broadly support the analytical results of Kartner et al.

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Kinsler P, Radnor SBP, Tyrrell JCA, New GHCet al., 2007, Optical carrier wave shocking: Detection and dispersion, PHYSICAL REVIEW E, Vol: 75, ISSN: 1539-3755

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• Citations: 14

Radnor SBP, Kinsler P, New GHC, 2007, CEP stabilization and measurement in the highly nonlinear regime, Conference on Lasers and Electro-Optics/Quantum Electronics and Laser Science Conference, Publisher: IEEE, Pages: 2199-2200

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Ross IN, New GHC, Bates PK, 2007, Contrast limitation due to pump noise in an optical parametric chirped pulse amplification system, Optics Communications, Vol: 273, Pages: 510-514

The contrast ratio of the recompressed output pulses in an optical parametric chirped pulse amplification system can be limited to temporal noise on the pump pulse. We present a simple analysis which can be used to estimate both the contrast ratio of this background noise and the duration of its pedestal. The estimated values compare well quantitatively with values derived using a more accurate computer simulation code.

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Rogel-Salazar J, Tsangaris CL, Chavez-Cerda S, New GHCet al., 2007, Propagation Invariant Beams: Bessel Beam Resonators, New Research on Lasers and Electro-optics, Editors: Arkin, Publisher: Nova Publishers, Pages: 1-35, ISBN: 9781600211126

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New GHC, 2007, Theory of pulse compression using aperiodic quasi-phase-matched gratings, Journal of the Optical Society of America B, Vol: 24, Pages: 1144-1149

A simple treatment of pulse comrpession in second harmonic generation based on the use of an aperiodically-poled noninear medium is presented. Particular emphasis is placedon the conditions that must be satisfied if the process is to work efficiently. The possible extension to the case of optical parametric amplification and oscillation is considered.

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Grace EJ, Tsangaris CL, New GHC, 2006, Competing processes in optical parametric chirped pulse amplification, OPTICS COMMUNICATIONS, Vol: 261, Pages: 225-230, ISSN: 0030-4018

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• Citations: 18

Yates MA, Tsangaris CL, Kinsler P, New GHCet al., 2006, Modelling of angular effects in nonlinear optical processes, OPTICS COMMUNICATIONS, Vol: 257, Pages: 164-175, ISSN: 0030-4018

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• Citations: 4

Kinsler P, Radnor SBP, New GHC, 2005, Theory of directional pulse propagation, PHYSICAL REVIEW A, Vol: 72, ISSN: 1050-2947

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• Citations: 31

Kinsler P, New GHC, 2005, Wideband pulse propagation: Single-field and multifield approaches to Raman interactions, PHYSICAL REVIEW A, Vol: 72, ISSN: 1050-2947

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• Citations: 7

Sali E, Kinsler P, New GHC, Mendham KJ, Halfmann T, Tisch JWG, Marangos JPet al., 2005, Behavior of high-order stimulated Raman scattering in a highly transient regime, PHYSICAL REVIEW A, Vol: 72, ISSN: 2469-9926

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• Citations: 29

Tyrrell JCA, Kinsler P, New GHC, 2005, Pseudospectral spatial-domain: a new method for nonlinear pulse propagation in the few-cycle regime with arbitrary dispersion, JOURNAL OF MODERN OPTICS, Vol: 52, Pages: 973-986, ISSN: 0950-0340

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• Citations: 36

Gundry S, Anscombe MP, Abdulla AM, Sali E, Tisch JWG, Kinsler P, New GHC, Marangos JPet al., 2005, Ultrashort-pulse modulation in adiabatically prepared Raman media, OPTICS LETTERS, Vol: 30, Pages: 180-182, ISSN: 0146-9592

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• Citations: 12

Rogel-Salazar J, Choi S, New GHC, Burnett Ket al., 2004, Methods of quantum field theory for trapped Bose-Einstein condensates, JOURNAL OF OPTICS B-QUANTUM AND SEMICLASSICAL OPTICS, Vol: 6, Pages: R33-R59, ISSN: 1464-4266

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• Citations: 9

Yates MA, New GHC, Albaho T, 2004, Calculating higher-order modes of one-dimensional unstable laser resonators, JOURNAL OF MODERN OPTICS, Vol: 51, Pages: 657-667, ISSN: 0950-0340

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• Citations: 9

Kinsler P, New GHC, 2004, Few-cycle soliton propagation, PHYSICAL REVIEW A, Vol: 69, ISSN: 1050-2947

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• Citations: 21

Tsangaris CL, New GHC, Rogel-Salazar J, 2003, Unstable Bessel beam resonator

We propose an unstable laser resonator design consisting of a conical and a convex mirror. The intensity profile of its lowest order mode resembles a Bessel function with little inherent modulation imposed by the geometry. © 2003 IEEE.

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