Now showing items 11-20 of 169
Comment on enhanced Raman scattering from adsorbates on semiconductor surfaces
(Elsevier, 1984-11-02)
A recently published model of surface enhanced Raman scattering from adsorbed molecules on semiconductor surfaces is compared to our experimental results for amorphous carbon on PbTe. The model fails to account for the ...
The ultrahigh-peak-power laser: present and future
(Springer-Verlag, 1997-08)
to 10 20 -W/cm 2 range. With some refinements and with superior energy storage materials, even higher peak power in the petawatt range should be possible from tabletop systems. In this paper we show the ultimate achievable ...
Amplification of 1 ps pulses at 1.053 [mu]m in a Ti:Al2O3 regenerative amplifier
(Elsevier, 1991-07-01)
We demonstrate the operation of a Ti:Al2O3 regenerative amplifier tunable around 1 [mu]m. Gains up to 108 at 1.053 [mu]m without any spectral narrowing are obtained. This amplifier is designed for use in terawatt picosecond ...
REVIEW ARTICLE: The relationship of the D-X centre in AlxGa1-xAs and other III-V alloys with the conduction band structure
(IOP Publishing Ltd, 1988-12-01)
The electrical properties of the AlxGa1-xAs alloys for x>or=0.24 are dominated by deep donors which appear in undoped and doped crystals. The corresponding defects, which are now more commonly known as D-X centres, also ...
An exactly solvable model of an avalanche-type measuring device
(IOP Publishing Ltd, 2006-11-01)
A quantum many-body model is presented with features similar to those of certain particle detectors. The energy spectrum contains a single, thermodynamically metastable “ready” state and macroscopically-distinct, ...
D-band (110-170 GHz) InP gunn devices
(Elsevier, 1993-11)
This paper reports on the development of InP Gunn sources for operation in the D-band (110-170 GHz). n+-n-n+ structures with flat doping as well as graded doping profiles have been considered. Oscillations were obtained ...
Pragmatic fully 3D image reconstruction for the MiCES mouse imaging PET scanner
(IOP Publishing Ltd, 2004-10-07)
We present a pragmatic approach to image reconstruction for data from the micro crystal elements system (MiCES) fully 3D mouse imaging positron emission tomography (PET) scanner under construction at the University of ...
Reduction of multi-photon ionization in dielectrics due to collisions
(Springer-Verlag, 1996-12)
The collisional effect due to the multi-photon ionization process in dielectric material has been studied. We found that the breakdown threshold of fused silica is the same for both linearly and circularly polarized light ...
Wavelength selective detection using excitonic resonances in GaAs/AlGaAs P-I-(MQW)-N structures
(Elsevier, 1990)
The quantum confined Stark effect causes a strong wavelength and voltage dependence of photocurrent near excitonic resonances which is used to study the wavelength selectivity of p-i(MQW)-n photodiode. For a parallel input ...
Chirped pulse amplification in an erbium-doped fiber oscillator/ erbium-doped fiber amplifier system
(Elsevier, 1994-03-15)
Chirped pulse amplification in erbium fibers is demonstrated. A passively mode locked erbium-doped fiber laser source provides the seed pulses for an erbium-doped fiber amplifier. The system produces femtosecond pulses at ...