Concept

Diode

Related publications (449)

Optical properties of In(Ga)As/GaAs quantum dot-based devices emitting at 1.3[mu]m

Self-assembled quantum-dots (QDs) represent a distributed ensemble of zero dimensional structures with a near-singular density of states. Implemented as the active medium in a diode laser their unique properties lead to improved and often novel characteris ...

EPFL2004

Couche mince semi-conductrice de GaInN, son procédé de préparation, diode électroluminescente comprenant cette couche et dispositif d'éclairage = Thin semiconductor GaInN layer, method for preparing same, light-emitting diode comprising said layer and illumination device

Nicolas Grandjean

Thin, single semi conducting layer of GaInN, possibly containing a small percentage of arsenic, phosphorus or antimony, the said layer emitting at least two visible lights with determined colours which can be combined, particularly to obtain white light. M ...

2003

Advanced high-power gyrotrons

Stefano Alberti, Minh Quang Tran

Gyrotrons at high frequency with high-output power are mainly developed for microwave heating and current drive in plasmas for thermonuclear fusion. For the stellarator Wendelstein 7-X, now under construction at IPP Greifswald, Germany, a 10-MW electron-cy ...

2003

Multilevel Inverter for Power System Applications : Highlighting Asymmetric Design Effects form a Supply Network Point of View

Alfred Rufer

This paper highlights some effects of an asymmetrical design on three phase multilevel inverters from a supply network point of view. The investigated topology is based on a series connection of single phase inverters (partial cell) in each phase. Each par ...

2003

GaN-based single mirror light emitting diodes

Jean-François Carlin, Marc Ilegems, Julien Dorsaz

We present a study on the dependence of the external Quantum Efficiency (QE) of Light Emitting Diodes (LEDs) on the device properties and p-contact metallisation. The external QE could be doubled by changing the p-type contact from oxidised Ni/Au to non-an ...

Iop Publishing Ltd2003

Microcavity light emitting diodes based on GaN membranes grown by molecular beam epitaxy on silicon

Nicolas Grandjean, Mauro Mosca

Resonant-cavity InGaN/GaN quantum well light emitting diodes have been fabricated. Nitride layers were grown by molecular beam epitaxy on Si (111). We fabricated the structures using a combination of Si substrate etching, GaN etching and dielectric (Ta2O5/ ...

2003

Optically addressing a large number of cantilevers

Jürgen Brugger, Marc Antonius Friedrich van den Boogaart

A heterodyne laser Doppler interferometer operating up to 100 MHz with an optical vibration excitation function was implemented to enable frequency detection of nanocantilevers. By using the stimulant of a network analyzer to sweep the modulation frequency ...

2003

Wavelength modulation spectroscopy: combined frequency and intensity laser modulation

Luc Thévenaz, Philippe Robert

A theoretical model of wavelength modulation spectroscopy that uses a laser diode on a Lorentzian absorption line is presented. This theory describes the general case of a current-modulated semiconductor laser for which a combined intensity and frequency m ...

Optical Society of America2003

Configurable Front-End Converters for Multicurrent Locomotives Operated on 16 2/3 Hz AC and 3 kV DC Systems

Alfred Rufer, Christophe Chabert

A configurable converter topology is presented as front-end converter for a locomotive that can be operated as well on a high voltage ac-system as on a medium voltage dc-system. The configurable converter is realized on the base of a multilevel chain, wher ...

2003

Highly efficient one- and two-cascade Raman lasers based on phosphosilicate fibers

René Salathé, Hans Georg Limberger, Florian Dürr, Marcel Zeller

Characteristics of one-cascade (1.06 double right arrow 1.24 mum) and two-cascade (1.06 double right arrow 1.24 double right arrow 1.48 mum) phosphorus-doped fiber Raman lasers are studied. The cavities of both lasers are formed by Bragg gratings written d ...

2003

Graph Chatbot

Chat with Graph Search

Ask any question about EPFL courses, lectures, exercises, research, news, etc. or try the example questions below.

DISCLAIMER: The Graph Chatbot is not programmed to provide explicit or categorical answers to your questions. Rather, it transforms your questions into API requests that are distributed across the various IT services officially administered by EPFL. Its purpose is solely to collect and recommend relevant references to content that you can explore to help you answer your questions.