1,315,630 research outputs found
Fibre Lasers for Gamma Colliders
The required lasers parameters for recently proposed gamma collider Higgs
factories are presented and reviewed in the context of new developments in high
average and peak power fibre laser technology. A possible laser architecture
based on fibres is proposed and some issues surrounding high average power
frequency conversion to the wavelengths required for a gamma collider are
discussed
Nanometer-scale sharpness in corner-overgrown heterostructures
A corner-overgrown GaAs/AlGaAs heterostructure is investigated with
transmission and scanning transmission electron microscopy, demonstrating
self-limiting growth of an extremely sharp corner profile of 3.5 nm width. In
the AlGaAs layers we observe self-ordered diagonal stripes, precipitating
exactly at the corner, which are regions of increased Al content measured by an
XEDS analysis. A quantitative model for self-limited growth is adapted to the
present case of faceted MBE growth, and the corner sharpness is discussed in
relation to quantum confined structures. We note that MBE corner overgrowth
maintains nm-sharpness even after microns of growth, allowing the realization
of corner-shaped nanostructures.Comment: 4 pages, 3 figure
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