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Browsing by Author "Rohwer, EG"

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  • De Clercq, LE; Botha, LR; Du Plessis, A; Rohwer, EG (South African Institute of Physics (SAIP), 2009-07)
    The purpose of this study was to develop a model of the coherent excitation of the first few vibrational modes in the electronic ground state of the molecule. The model will be used in combination with an optimization ...
  • Forbes, A; Du Plessis, A; Rohwer, EG (The International Society for Optical Engineering, 2005-08)
    Infra-red laser beam shaping has the inherent difficulty that simple ray tracing methods often yield anomalous results, due primarily to the propagation effects at longer wavelengths. Techniques based on diffraction theory ...
  • Steenkamp, CM; Dickenson, GD; Nortje, AC; Rohwer, EG; Du Plessis, A (SAIP 2010, 2010-09)
    Twenty rovibronic transitions of the e(v'=5)-X(v''=0) band of the 12C16O which experimental wavelengths were previously unavailable were recently detected by vr induced fluorescence excitation spectroscopy. The data is ...
  • Neethling, PH; Rohwer, EG; Schwoerer, H; Botha, L (2010-10)
    The Laser Research Institute and the CSIR National Laser Centre are developing a high power femtosecond laser system in a joint project with a phased approach. The laser system consists of an fs oscillator and a regenerative ...
  • Ombinda-Lemboumba, Saturnin; Du Plessis, A; Sparrow, RW; Molukanele, P; Botha, LR; Rohwer, EG; Steenkamp, CM; Van Rensburg, L (Academy of Science of South Africa, 2009-09)
    Measurements of ultrafast transient processes, of temporal durations in the picosecond and femtosecond regime, are made possible by femtosecond pump probe transient absorption spectroscopy. Such an ultrafast pump probe ...
  • Ombinda-Lemboumba, Saturnin; du Plessis, A; Botha, LR; Rohwer, EG; Steenkanp, CM (CSIR, 2010-09-01)
    Phthalocyanines are new class of photosensitiser used for photodynamic therapy. These drugs are used to treat small and superficial tumours. In recent years, a particular attention has been given to phthalocyanine in order ...
  • Du Plessis, A; Rohwer, EG; Steenkamp, CM (Elsevier, 2007)
    The four carbon monoxide (CO) isotopomers 12C16O, 13C16O, 12C18O and 12C17O have been detected simultaneously in a CO gas sample of natural isotopic abundance by measuring rovibronic excitation spectra of six vibronic bands ...
  • Madigoe, RJ; Botha, LR; Uys, H; Rohwer, EG; Smit, A (2012-10)
    According to a theoretical analysis, the control landscape of many quantum control problems has a very favourable topology regardless of the detailed nature of the Hamiltonian, provided that one has full control of the ...
  • Ombinda-Lemboumba, Saturnin; Du Plessis, A; Botha, L; Roberts, DE; Molukanele, P; Sparrow, RW; Rohwer, EG; Steenkamp, CM (2009-07)
    The presentation discusses basic principles of pump-probe technique, possible transient absorption signals, LHC II and ZnPc, experimental setup, chirp measurement and correction methods. The results of the study, conclusion ...
  • Ombinda-Lemboumba, Saturnin; du Plessis, A; Botha, LR; Rohwer, EG; Steenkamp, CM (2010-10)
    The ultrafast dynamics of Zinc Phthalocyanine was studied using trasient absorption pump probe spectroscopy. Zinc Phthalocyanine was excited (pumped) at 672nm and probed by a white light continuum. The pump-probe technique ...
  • Forbes, A; Du Plessis, A; Rohwer, EG (2006-07)
    Wavelength tuneability is demonstrated both experimentally and numerically. Refractive element shows some anomalies, intensity correctly reproduced, but not phase. Future work will consider impact of beta on performance of designs
  • Spangenberg, D-M; Dudley, Angela L; Neethling, PH; Rohwer, EG; Forbes, A (Optical Society of America, 2014)
    Spatial light modulators are ubiquitous tools for wavefront control and laser beam shaping but have traditionally been used with monochromatic sources due to the inherent wavelength dependence of the calibration process ...