Now showing items 5-24 of 39

  • Effects of optical bias on moving gratings in bismuth silicon oxide at large fringe modulation 

    Wang, Z. Q.; Cartwright, Colin M.; Gillespie, W. A.; Cook, N. J. (Optical Society of America, 1996)
    Optical bias has been applied in the formation of moving gratings in bismuth silicon oxide at large fringe modulations. It is shown that optical bias is an effective method of overcoming the problems associated with the ...
  • Electro-optic bunch diagnostics on ALICE 

    Phillips, P. J.; Gillespie, W. A.; Jamison, S. P.; MacLeod, Allan M. (Joint Accelerator Conferences Website, 2009)
    An electro-optic longitudinal bunch profile monitor has been implemented on ALICE (Accelerators and Lasers in Combined Experiments) at the Daresbury Laboratories and will be used both to characterise the electron bunch and ...
  • 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, 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 ...