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A. Aleksandrova
Researcher at Humboldt University of Berlin
Publications - 14
Citations - 866
A. Aleksandrova is an academic researcher from Humboldt University of Berlin. The author has contributed to research in topics: Laser & Quantum cascade laser. The author has an hindex of 7, co-authored 13 publications receiving 679 citations.
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Mid-infrared optical properties of thin films of aluminum oxide, titanium dioxide, silicon dioxide, aluminum nitride, and silicon nitride
Jan Kischkat,Sven Peters,Bernd Gruska,Mykhaylo P. Semtsiv,Mikaela Chashnikova,Matthias Klinkmüller,O. Fedosenko,S. Machulik,A. Aleksandrova,Gregorii Monastyrskyi,Yuri V. Flores,W. Ted Masselink +11 more
TL;DR: The investigation shows how sensitive the refractive index functions are to the O2 and N2 flow rates, and for which growth conditions the materials deposit homogeneously, and allows conclusions to be drawn on the degree of amorphousness and roughness.
Mid-infrared optical properties of thin films of aluminum oxide, titanium dioxide, silicon dioxide, aluminum nitride, and silicon nitride. Appl. Opt. 51, 6789-6798
Jan Kischkat,Sven Peters,Bernd Gruska,Mykhaylo P. Semtsiv,Mikaela Chashnikova,Matthias Klinkmüller,O. Fedosenko,S. Machulik,A. Aleksandrova,Gregorii Monastyrskyi,Yuri V. Flores,W. Ted Masselink +11 more
TL;DR: In this article, the complex refractive index components, n and k, have been studied for thin films of several common dielectric materials with a low to medium this article as functions of wavelength and stoichiometry for mid-infrared (MIR) wavelengths within the range 1.54-14.29 μm.
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Thermally activated leakage current in high-performance short-wavelength quantum cascade lasers
Yuri V. Flores,Mykhaylo P. Semtsiv,M. Elagin,G. Monastyrskyi,Sergii Kurlov,A. Aleksandrova,Jan Kischkat,William Ted Masselink +7 more
TL;DR: In this paper, the authors formulated the threshold condition for a 4-level quantum cascade laser (QCL)-active region to include thermally activated leakage of charge carriers from active region confined states into states with higher energy.
Journal ArticleDOI
Buried-heterostructure quantum-cascade laser overgrown by gas-source molecular-beam epitaxy
Mikaela Chashnikova,G. Monastyrskyi,A. Aleksandrova,Matthias Klinkmüller,Mykhaylo P. Semtsiv,William Ted Masselink +5 more
TL;DR: In this article, the authors describe the realization of buried-heterostructure quantum-cascade lasers (QCLs) using gas-source molecular beam epitaxy both for the growth of the active region as well as for the regrowth of InP:Fe.
Journal ArticleDOI
Power scaling in quantum cascade lasers using broad-area stripes with reduced cascade number
TL;DR: In this article, the authors demonstrate a path for further power scaling that is based on broad stripes with fewer than 15 cascades and show that the ability to efficiently extract heat from the top and bottom of the lasers more than offsets the Γ disadvantage.