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Design, simulation and analysis of laterally-longitudinally non-uniform edge-emitting GaAs-based diode lasers (Band 73)
Edge-emitting quantum-well diode lasers based on GaAs combine a high conversion efficiency, a wide range of emission wavelengths covering a span from 630 nm to 1180 nm, and the ability to achieve high output powers. The often used longitudinal-invariant Fabry-Pérot-type resonators are easy to design but often lead to functionality or performance limitations. In this work, the application of laterally-longitudinally non-uniform resonator configurations is explored as a way to reduce unwanted and performance-limiting effects. The investigations are carried out on existing and entirely newly developed laser designs using dedicated simulation tools. These include a sophisticated time-dependent ...
Simulation and Design of a Compact GaAs Based Tunable Dual-wavelength Diode Laser System
We present our design of a compact, integrated and tunable dual-wavelength diode laser system emitting around 785 nm, which is of interest for several applications like Raman spectroscopy and the generation of THz radiation. To achieve a more compact device compared to previous GaAs based designs two etch depths are realized, leading to shallowly etched ridge waveguides in regions were optical gain is applied and deeply etched waveguides used to enable compact integrated waveguide components. The device parameters are optimized using a numerically efficient simulation tool for passive waveguides. Subsequently, the entire laser system is further analyzed applying a sophisticated traveling-wave equation based model for active devices giving access to internal intensity and carrier density distributions. It is shown that active laser simulations all-passive simulation.
Investitionsschutz in Europa
Zwischen der Investitionsschiedsgerichtsbarkeit und dem EuGH herrscht seit dessen Urteil in der Rechtssache Achmea ein Justizkonflikt. Das europaische Verfassungsprinzip der Autonomie kollidiert mit volkervertraglich garantierten Investor-Staat-Schiedsklauseln. Die durch den Konflikt verursachte Unsicherheit betrifft nicht nur den Investitionsschutz im Binnenmarkt. Sie stellt auch die zahlreichen Investitionsschutzabkommen zwischen EU-Mitgliedsstaaten und Drittstaaten und sogar die Handelsschiedsgerichtsbarkeit infrage. Um diese Unsicherheit zu umgehen, entwickelt Jan Philipp Koster eine kontextorientierte Lesart der EuGH-Rechtsprechung und zeigt ihre schiedsverfahrensrechtlichen Folgen auf. Abschliessend macht er einen Vorschlag, wie der Investitionsschutz im Binnenmarkt zukunftig ausgestaltet werden kann.
Hegel
A monumental new biography of a pivotal yet poorly understood pioneer in modern philosophy. When a painter once told Goethe that he wanted to paint the most celebrated man of the age, Goethe directed him to Georg Wilhelm Friedrich Hegel. Hegel worked from the credo: To philosophize is to learn to live freely. While he was slow and cautious in the development of his philosophy, his intellectual growth was like an odyssey of the mind, and, contrary to popular belief, his life was full of twists and turns, suspense and even danger. In this landmark biography, the philosopher Klaus Vieweg paints a new picture of the life and work of the most important representative of German idealism. His vivid...
German Football
This unique collection of essays by German and British academics examines the history and significance of football in German culture and society.
