frequent 06-2014
frequent 06_2014 - terahertz electronics (pdf)


Top score - FBH positively evaluated and recommended for further funding

FBH news: 24.03.2015

In its meeting on March 23, 2015, the Senate of the Leibniz Association recommended the Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik (FBH) for further joint funding by the federal and state authorities. This represents the successful completion of the current evaluation process at FBH, conducted by international experts every seven years, which is obligatory for each Leibniz institute.

Günther Tränkle, Director of the FBH, was very pleased about the extraordinary positive rating, according to which the institute belongs to the internationally most renowned competence centers in the field of III-V semiconductor technology. The report acknowledges that the institute has impressively enhanced the already very high performance level. FBH’s work in the field of III-V semiconductor technology is considered to yield excellent and internationally competitive state-of-the-art results with applications and technology transfer of high scientific, social, and economic relevance. "This report positively confirms our concept and our results", explains Günther Tränkle, "and encourages us to further pursue and even expand our ambitions resulting in excellent research and comprehensive transfer activities."

more... (press release, Leibniz Association - in German)

Building brighter, more powerful lasers diodes

Source: Compound Semiconductor, March 2015, p. 30 ff.

(...) Reducing the number of lateral modes has also held the key to the high performance of lasers fabricated by scientists from the Ferdinand Braun Institute in Berlin. By combining advanced epitaxial designs with facet passivation and 30 µm-wide stripes that cut off higher order lateral modes, the team could produce diodes delivering more than 7 W at an efficiency in excess of 50 percent, while realising a beam parameter product of around 1.5 mm-mrad. (...)
more... (pdf, FBH from p. 33)

Placed first in "Most Downloaded Journal of Crystal Growth Articles"

Source: Elsevier Journals, 18.02.2015

A recently published joint paper of FBH, Hochschule Ruhr West, and Laytec currently ranks on the first place among the articles in Journal of Crystal Growth most downloaded in the last 90 days. The paper reports the first in-situ photoluminescence study of growing InGaN LED structures inside an industrial-grade MOVPE reactor. It reveals that the emission wavelength of LEDs can already been determined and if necessary adjusted during growth.
... overview
... paper

Prof. Dr.-Ing. Wolfgang Heinrich re-elected as President of the European Microwave Association

FBH news: 16.02.2015

At the turn of the year, Wolfgang Heinrich, FBH's long-term Microwaves Department Head and Professor at the Technische Universität Berlin, took over the presidency of the European Microwave Association (EuMA) for another three-year term. He is already holding this function since 2010.

EuMA has members from all over Europe and adjacent nations. It is one of the internationally most important associations for scientists and engineers within the microwave field. The non-profit organization which is based in Belgium both encourages cooperation within the technology field and promotes microwave activities in Europe by means of education and training. It holds the annual European Microwave Week which comprises three conferences and an exhibition - apart from the International Microwave Week in the United States, this event is the most important microwaves conference world-wide with about 1,500 conference participants and typically 4,000 visitors.

Schwereloses Interferometer

Source: Pro Physik , 04.02.2015 (in German)

Die Gültigkeit des Äquivalenzprinzips auf atomarer Ebene zu überprüfen ist Ziel des Gemeinschaftsprojektes QUANTUS III, an dem die Universitäten Hannover, Hamburg, Ulm, Mainz, Darmstadt, Bremen und die HU-Berlin sowie das FBH beteiligt sind.

Berliner Forscher überprüfen Einstein

Source: Berliner Zeitung, 03.02.2015 (in German)

Sie wollen im Weltall testen, ob Atome verschiedener Stoffe im Vakuum wirklich gleich schnell fallen.
(in German, article not online)

Wie allgemein ist die Allgemeine Relativitätstheoriee

Press release: 30.01.2015 (in German)

"Auf der Größenskala von Galaxien erklären die Gesetze der Gravitation nicht, warum sich das Universum so entwickelt hat, wie wir es kennen“, sagt Andreas Wicht, Leiter der Arbeitsgruppe Lasermetrologie am Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik (FBH). „Und für die mikroskopische Ebene, unterhalb von hundert Mikrometern, gibt es gar keine experimentelle Überprüfung der Gültigkeit des Gravitationsgesetzes, so wie wir es kennen."
more... (only in German, related image available)

Stark und effizient

Source: Pro Physik, 23.01.2015 (in German)

Diodengepumpte Festkörperlaser, die hohe Impulsenergien im Joule-Bereich bei mittleren Leistungen von mehreren hundert Watt liefern, waren bislang weltweit nicht verfügbar. Sie werden jedoch für Hochfeldlasersysteme, die auf leistungsstarken Ultrakurzpuls-Lasern basieren, dringend benötigt.
more... (only in German)

Knighthood for Scientific Board Member Frank van den Bogaart

FBH news: 21.01.2015

The FBH congratulates its long-term member of the Scientific Board Frank van den Bogaart. Dr. van den Bogaart was knighted in the Order of Oranje-Nassau by the Dutsch King Willem-Alexander in September 2014. He received his royal honor for his achievements in the field of radar technology with particular focus on microwave monolithic integrated circuits (MMICs).

Effizient und robust: Hochleistungs-Pumplasermodul mit Faserkopplung

Press release FBH/C2GO: 19.01.2015 (in German)

Das innovative Modul mit 6 kW Lichtleistung basiert auf besonders effizienten, leistungsstarken 940 nm QCW-Diodenlasern aus dem Ferdinand-Braun-Institut und einem von C2GO inprocess solutions entwickelten wassergekühlten Trägermodul, das eine neuartige, sehr effiziente Montage ermöglicht.
more... (only in German)

FBH uses LayTec's EpiCurve in-situ metrology to eliminate SiC/GaN wafer cracking in ICP etching

Source: 16.01.2015

In-situ metrology system maker LayTec AG of Berlin, Germany says that researchers at Berlin-based Ferdinand-Braun-Institut für Höchstfrequenztechnik (FBH) have applied EpiCurve in-situ metrology for optimizing etching recipes in a Sentech SI 500 inductively coupled plasma reactive-ion etch (ICP-RIE) tool.
more... (in Englisch)

Best of Berlin + Brandenburg

Source: Adlershof Journal, 01/2015 (in German)

Er [Kirstaedter, Lumics GmbH] geht davon aus,  dass Diodenlaser aus Adlershof einige etablierte Lasertechnologien in den Hintergrund drängen werden. "Ohne die tollen Kooperationsmöglichkeiten hier am Standort, insbesondere mit dem Ferdinand-Braun-Institut (FBH), wäre diese Entwicklung wohl kaum möglich gewesen", lobt Kirstaedter.
more... (in German)

Adlershof: Experimentierfeld für Lichtgestalten

Source: Adlershof Journal, 15.01.2015 (in German)

Schon seit den 1960er-Jahren heben Forscher und Entwickler in Adlershof technologische und wirtschaftliche Potenziale des Lichts. Aktuell treiben über ein halbes Dutzend universitärer und außeruniversitärer Institute optische und photonische Forschung voran.
more... (in German)