7 research outputs found
Optimization of broadband semiconductor chirped mirrors with genetic algorithm
Genetic algorithm was applied for optimization
of dispersion properties in semiconductor Bragg reflectors
for applications in femtosecond lasers. Broadband,
large negative group-delay dispersion was achieved in the
optimized design: The group-delay dispersion (GDD) as
large as −3500 fs2
was theoretically obtained over a 10-nm
bandwidth. The designed structure was manufactured and
tested, providing GDD −3320 fs2
over a 7-nm bandwidth.
The mirror performance was verified in semiconductor
structures grown with molecular beam epitaxy. The mirror
was tested in a passively mode-locked Yb:KYW laser
Study of interfaces chemistry in type-II GaSb/InAs superlattice structures
There is a considerable interest in type-II GaSb/InAs superlattice system due to several modern applications
including infrared detectors. In these studies X-ray Photoelectron Spectroscopy (XPS) and Spectroscopic
Ellipsometry (SE) have been used to extensive characterization of the surface and interface of GaSb/InAs
superlattice. Application of XPS and SE techniques provide precise information from topmost layers of structure
and allow excluding presence of GaAs-type interfaces in GaSb/InAs superlattices. Simultaneously, these results
indicate that InSb-type or GaInSb-type interfaces have been detected in the structures studied