Now showing items 11-30 of 39

  • Electron beam quality measurements on the ALPHA-X laser-plasma wakefield accelerator 

    Welsh, G. H.; Anania, M. P.; Aniculaesei, C.; Brunetti, D.; 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 ...
  • Experimental implementation of a photorefractive joint transform correlator with circular harmonic filters 

    Zhang, H.; Cartwright, Colin M.; Ding, M. S.; Wang, Z. Q.; Cook, N. J.; Gillespie, W. A. (Elsevier, 2000)
    We present an experimental realization of optical correlation for real-time rotational-invariance pattern recognition by means of a photorefractive joint transform correlator. Single and multiple circular harmonic components ...
  • 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, C.; 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 ...
  • Implementation of a photorefractive binary joint transform correlator 

    Cook, N. J.; Carnicer, A.; Vallmitjana, S.; Juvells, I.; Cartwright, Colin M.; Gillespie, W. A. (Optical Society of America, 1998)
    The use of photorefractive materials such as Bi 12 SiO 20 as dynamic holographic media is becoming an interesting alternative to that of the current liquid-crystal-based modulators in real-time optical image processing. ...
  • 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 ...
  • Real-time intensity correlation with a synthetic discriminant function filter 

    Wang, Z. Q.; Cartwright, Colin M.; Gillespie, W. A. (Optical Society of America, 1994)
    Real-time optical intensity correlation with a synthetic discriminant function (SDF) filter has been realized. The computed SDF data are fed into an Epson liquid-crystal television to create the optical reference signal. ...
  • Real-time optical intensity correlator using photorefractive BSO and a liquid crystal television 

    Soutar, C.; Wang, Z. Q.; Cartwright, Colin M.; Gillespie, W. A. (Taylor & Francis, 1992)
    We demonstrate the implementation of an optical intensity correlator using Bi12SiO20 (BSO) as a dynamic holographic medium. The advantages of this correlator are large tolerance in the placement of input objects and BSO ...