Now showing items 131-137 of 137
The development of an electron gun for performing ultrafast electron diffraction experiments
(Stellenbosch : Stellenbosch University, 2009-12)
ENGLISH ABSTRACT: This thesis aims to comprehensively discuss ultrafast electron di raction and its role in temporally resolving ultrafast dynamics on the molecular level. Theory on electron pulses and electron pulse ...
Characterization of thulium doped fiber for mid infrared laser applications
(Stellenbosch : University of Stellenbosch, 2011-03)
Please refer to full text to view abstract.
Ultrafast electron diffraction : source development, diffractometer design and pulse characterisation
(Stellenbosch : University of Stellenbosch, 2010-12)
ENGLISH ABSTRACT: Ultrafast Electron Diffraction (UED) is a rapidly maturing field which allows investigation of the evolution of atomic arrangement in solids on timescales comparable to the vibrational period of their ...
Correlations between the standard and alternative definitions of the beam quality factor
(Stellenbosch : University of Stellenbosch, 2005-04)
ENGLISH ABSTRACT: The beam quality factor (M2) of a laser is important because it describes both the quality of a laser beam as well as its propagation. Particular applications require that the beam radii (from which ...
Ultrafast structural dynamics in 4Hb-TaSe2 observed by femtosecond electron diffraction
(Stellenbosch : Stellenbosch University, 2013-03)
ENGLISH ABSTRACT: In this thesis the structural dynamics, upon photo-excitation, of the charge-densitywave (CDW) material 4Hb-TaSe2 is investigated on the time-scale of atomic motion and simultaneously on the spatial-scale ...
A characterization of beam shaping devices and a tunable Raman laser
(Stellenbosch : University of Stellenbosch, 2003-04)
ENGLISH ABSTRACT: The efficient manipulation of various nonlinear optical processes frequently requires the shaping of the laser beams used for these processes. Three beam shaping techniques were investigated in this ...
Suboptimal LULU-estimators in measurements containing outliers
(Stellenbosch : Stellenbosch University, 2013-12)
ENGLISH ABSTRACT: Techniques for estimating a signal in the presence of noise which contains outliers are currently not well developed. In this thesis, we consider a constant signal superimposed by a family of noise ...