Now showing items 5-24 of 35

  • Electro-optic technique with improved time resolution for real-time, nondestructive, single-shot measurements of femtosecond electron bunch profiles 

    Berden, G.; Jamison, S. P.; MacLeod, Allan M.; Gillespie, W. A.; Redlich, B.; van der Meer, A. F. G. (American Physical Society, 2004-09)
    Electro-optic detection of the Coulomb field of a relativistic electron bunch combined with single-shot cross correlation of optical pulses is used to enable single-shot measurements of the shape and length of femtosecond ...
  • Electro-optic techniques for longitudinal electron bunch diagnostics 

    Berden, G.; van der Meer, A. F. G.; Jamison, S. P.; Steffen, B.; Schmidt, B.; Schmüser, P.; MacLeod, Allan M.; Gillespie, W. A.; Phillips, P. J. (2008)
    Electro-optic techniques are becoming increasingly important in ultrafast electron bunch longitudinal diagnostics and have been successfully implemented at various accelerator laboratories. The longitudinal bunch shape is ...
  • Electro-optic techniques for temporal profile characterisation of relativistic Coulomb fields and coherent synchrotron radiation 

    Jamison, S. P.; Berden, G.; MacLeod, Allan M.; Jaroszynski, D. A.; Redlich, B.; van der Meer, A. F. G.; Gillespie, W. A. (Elsevier, 2006-02)
    Electro-optic (EO) detection of relativistic Coulomb fields offers a method for non-destructive longitudinal profile measurements of ultrashort bunches. Techniques for single-shot EO characterisation of Coulomb fields which ...
  • Electro-optic time profile monitors for femtosecond electron bunches at the soft x-ray free-electron laser FLASH 

    Steffen, B.; Arsov, V.; Berden, G.; Gillespie, W. A.; Jamison, S. P.; MacLeod, Allan M.; van der Meer, A. F. G.; Phillips, P. J.; Schlarb, H.; Schmidt, B.; Schmüser, P. (American Physical Society, 2009-03)
    Precise measurements of the temporal profile of ultrashort electron bunches are of high interest for the optimization and operation of ultraviolet and x-ray free-electron lasers. The electro-optic (EO) technique has been ...
  • Electron beam quality measurements on the ALPHA-X laser-plasma wakefield accelerator 

    Welsh, G. H.; Anania, M. P.; Aniculaesei, C.; Brunetti, E.; Burgess, R. T. L.; Cipiccia, S.; Clark, D.; Ersfeld, B.; Islam, M. R.; Issac, R. C.; Manahan, G. G.; McCanny, T.; Raj, G.; Reitsma, A. J. W.; Shanks, R. P.; Vieux, G.; Wiggins, S. M.; Jaroszynski, D. A.; Gillespie, W. A.; MacLeod, Allan M.; van der Geer, S. B.; de Loos, M. J. (Joint Accelerator Conferences Website, 2010-06)
    The Advanced Laser-Plasma High-Energy Accelerators towards X-rays (ALPHA-X) programme at the University of Strathclyde is developing laser-plasma wakefield accelerators to produce high energy, ultra-short duration electron ...
  • Enhancement of two-wave coupling in a Ce:KNSBN crystal with optimum polarization of the writing beams 

    Liang, Bao-Lai; Wang, Zhaoqi; Cartwright, Colin M.; Gillespie, W. A.; Ding, Mei-Song (Optical Society of America, 2001)
    We have improved the two-wave coupling amplification and the signal-to-noise ratio of an amplified signal with photorefractive cerium-doped potassium sodium strontium barium niobate (Ce:KNSBN) by employing optimum polarization ...
  • High quality electron beams from a laser wakefield accelerator 

    Wiggins, S. M.; Issac, R. C.; Welsh, G. H.; Brunetti, E.; Shanks, R. P.; Anania, M. P.; Cipiccia, S.; Manahan, G. G.; Aniculaesei, C.; Ersfeld, B.; Islam, M. R.; Burgess, R. T. L.; Vieux, G.; Gillespie, W. A.; MacLeod, Allan M.; van der Geer, S. B.; de Loos, M. J.; Jaroszynski, D. A. (Institute of Physics, 2010-12)
    High quality electron beams have been produced in a laser-plasma accelerator driven by femtosecond laser pulses with a peak power of 26 TW. Electrons are produced with an energy up to 150 MeV from the 2 mm gas jet accelerator ...
  • High quality electron beams from a laser wakefield accelerator 

    Wiggins, S. M.; Shanks, R. P.; Issac, R. C.; Welsh, G. H.; Anania, M. P.; Brunetti, E.; Vieux, G.; Cipiccia, S.; Ersfeld, B.; Islam, M. R.; Burgess, R. T. L.; Manahan, G.; Aniculaesei, C.; Gillespie, W. A.; MacLeod, Allan M.; Jaroszynski, D. A. (Optical Society of America, 2010-07-01)
    Very stable, high quality electron beams (current ~ 10 kA, energy spread < 1%, emittance ~ 1π mm mrad) have been generated in a laser-plasma accelerator driven by 25 TW femtosecond laser pulses.
  • Holographic recording with orthogonally polarized beams in a cesium-doped (k(0.5)na(0.5))(0.2)(sr(0.75)ba(0.25))(0.9)nb(2)o(6) crystal 

    Liang, B. L.; Wang, Z. Q.; Cartwright, Colin M.; Zhang, H.; Ding, M. S.; Gillespie, W. A. (Optical Society of America, 2001-09)
    Holographic recording with orthogonally polarized beams in a cesium-doped KNSBN [(K(0.5)Na(0.5))(0.2)(Sr(0.75)Ba(0.25))(0.9)Nb(2)O(6)] crystal has been studied. It was found that this kind of photorefractive crystal possesses ...
  • Holographic-recording improvement in a bismuth silicon oxide crystal by the moving-grating technique 

    Wang, Z. Q.; Gillespie, W. A.; Cartwright, Colin M. (Optical Society of America, 1994)
    We investigate the enhancement of the diffraction efficiency of dynamic gratings recorded in a bismuth silicon oxide crystal at large modulation by the moving-grating technique. The optimum fringe velocity for maximum ...
  • Hybrid diffractive-refractive 40° head-mounted display 

    Wang, Zhao-Qi; Yu, F.; Cartwright, Colin M.; Gillespie, W. A. (Elsevier, 2003)
    The design of a head-mounted display with a field of view of 40 degrees and suitable for use with a micro display of 17.5 mm diagonal is presented. It is a combination of a diffractive-refractive eyepiece with an appropriate ...
  • Hybrid diffractive-refractive ultra-wide-angle eyepieces 

    Wang, Zhao-Qi; Zhang, Hui-Juan; Fu, Ru-Lian; Mu, Guo-Guang; Lu, Zhen-Wu; Cartwright, Colin M.; Gillespie, W. A. (Elsevier, 2002)
    Two kinds of hybrid diffractive-refractive ultra-wide-angle (70°) eyepieces are designed which are with considerably reduced apparent size and weight and with comparable or improved aberrations as compared with the ...
  • Longtitudinal electron beam diagnostics via upconversion of THz to visible radiation 

    Berden, G.; van der Meer, A. F. G.; Jamison, S. P.; MacLeod, Allan M.; Gillespie, W. A.; Phillips, P. J. (2009)
    Longitudinal electro-optic electron bunch diagnostics has been successfully applied at several accelerators. The electro-optic effect can be seen as an upconversion of the Coulomb field of the relativistic electron bunch ...
  • Narrow spread electron beams from a laser-plasma wakefield accelerator 

    Wiggins, S. M.; Anania, M. P.; Brunetti, E.; Cipiccia, S.; Ersfeld, B.; Islam, M. R.; Issac, R. C.; Raj, G.; Shanks, R. P.; Vieux, G.; Welsh, G. H.; Gillespie, W. A.; MacLeod, Allan M.; Jaroszynski, D. A. (SPIE, 2009)
    The Advanced Laser-Plasma High-Energy Accelerators towards X-rays (ALPHA-X) programme is developing laserplasma accelerators for the production of ultra-short electron bunches with subsequent generation of incoherent ...
  • Optical implementation of a photorefractive joint transform correlator with wavelet filters 

    Zhang, H.; Cartwright, Colin M.; Ding, M. S.; Gillespie, W. A. (Elsevier, 2000)
    We have investigated a real-time photorefractive joint transform correlator (JTC) with a bank of wavelet filters. In the experimental set-up, a photorefractive crystal BSO has been used as the dynamic holographic medium ...
  • An optical matched filter using a quantized amplitude compensation technique 

    Wang, Z. Q.; Cartwright, Colin M.; Gillespie, W. A. (Elsevier, 1993)
    Starting from the amplitude-encoded binary phase-only filter, a 4-grey level quantized amplitude compensated matched filter is proposed. Computer simulations show that amplitude quantization has little effect on the filter ...
  • Optical pattern recognition using a synthetic discriminant amplitude-compensated matched filter 

    Wang, Z. Q.; Gillespie, W. A.; Cartwright, Colin M.; Soutar, C. (Optical Society of America, 1993)
    A technique for optical pattern recognition using an amplitude-compensated matched filter is presented. With the synthetic discriminant function in a matched spatial filtering application an iterative technique is employed ...
  • Real-time color image correlation with a color liquid-crystal television and a Fresnel holographic filter 

    Wang, Z. Q.; Cartwright, Colin M.; Soutar, C.; Gillespie, W. A. (Optical Society of America, 1993)
    Incoherent color image correlation with a multiwavelength Fresnel holographic filter and a color liquid-crystal television as a real-time input device is demonstrated.
  • Real-time computer-aided multiplexed optical intensity correlator using Fresnel holographic filters and a liquid crystal television 

    Wang, Z. Q.; Gillespie, W. A.; Cartwright, Colin M.; Soutar, C. (Elsevier, 1991)
    A real-time computer-aided optical intensity correlator using multiplexed Fresnel holographic filters (FHFs) and a liquid crystal television (LCTV) is described. This technique is characterized by the following. The spatially ...
  • Real-time edge-enhanced object correlation using incoherent readout of photorefractive BSO 

    Wang, Z. Q.; Soutar, C.; Gillespie, W. A.; Cartwright, Colin M. (Elsevier, 1993)
    Real-time edge-enhanced image correlation using the incoherent readout of a dynamic hologram recorded in BSO crystal is reported for the first time. A system is described which records the Fresnel transform of the input ...