Graduiertenkolleg Quantum Fields and Strongly Interacting Matter - News

[Studierende Physik] Einladung zum Physikalischen Kolloquium und Verleihung der Tutorenpreise 28.04.2014 ( 24.04.14 )
Per E-Mail eingestellt von reimann@physik.uni-bielefeld.de:

Liebe Studierende der Physik,

hiermit lade ich Sie recht herzlich zum Physikalischen Kolloquium ein:

IN DIESEM KOLLOQUIUM WERDEN AUCH DIE PREISE AN DIE BESTEN TUTOREN
DES WS 2013/14 VERLIEHEN

Prof. Dr. Karsten Buse, Fraunhofer-Institut für Physikalische Messtechnik Freiburg

Lasers become colorful: Synthesizers for light!

28.04.2014, 16:15, Hoersaal 6

Widely tunable lasers are becoming a reality, pushing applications like optical spectroscopy as well as enabling new fundamental experiments in, e.g., quantum optics. Lasers by themselves emit at well-defined wavelengths. However, optical parametrical oscillators – synthesizers for light – can split photons and hence generate in principle light of any desired wavelength. There have been remarkable advances in realizing such systems. The innovations pushing this field will be reviewed and special emphasis will be on “whispering gallery mode resonators”: This are discs – as shown in the photograph – where light is guided by total internal reflection. Although their diameter is just about 1 cm, the light propagates within these discs for hundreds of meters, enhancing strongly the light-matter interaction and allowing realization of tunable lasers having the footprint of a postal stamp.

Viele Gruesse,

Peter Reimann

http://www2.physik.uni-bielefeld.de/veranstaltungen.html

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Prof. Dr. Peter Reimann
Universitaet Bielefeld
Fakultaet fuer Physik
Postfach 10 01 31
33501 Bielefeld
Tel.: +49-521-106-6206
Fax: +49-521-106-6455
email: reimann@physik.uni-bielefeld.de
web: http://www2.physik.uni-bielefeld.de/condmat_reimann.html
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Information zum Mailverteiler: Alle Studierenden der Fakultaet fuer Physik
[Studierende Physik] Einladung zum Physikalischen Kolloquium 07.04.2014 ( 07.04.14 )
Per E-Mail eingestellt von pfeiffer@physik.uni-bielefeld.de:

Liebe Studierende der Physik,

hiermit lade ich Sie recht herzlich zum Physikalischen Kolloquium ein:

Dr. Adam Deller, ASTRON, NL

Zooming in on feedback with high resolution radio observations

07.04.2014, 16:15, Hoersaal 6

Whilst it is now well-established that energetic feedback processes play an essential role in sculpting modern galaxies, the relative importance of different feedback sources remains uncertain. Accretion onto supermassive black holes (AGN) forms one source of feedback, and intense formation of massive stars (starbursts) another. Identifying the relative abundance and impact of these feedback sources, using multiwavelength surveys of a large number of galaxies across cosmic time, is a crucial step to understanding the evolutionary history of the Universe. Radio observations have the particular advantage of being virtually unaffected by absorption, but are typically conducted at moderate angular resolution, making it difficult to separate starburst emission from AGN emission. Very high angular resolution radio observations can be used as a reliable AGN identification tool, but have historically been too costly to apply to surveys. In this talk, I will discuss some new techniques which enable high-resolution surveying in the radio, and present the results of a survey which has, for the first time, detected thousands of radio AGN. I will conclude by discussing the major leap in capabilities which will be provided by the upcoming Square Kilometre Array.

Viele Gruesse,

Walter Pfeiffer

http://www2.physik.uni-bielefeld.de/veranstaltungen.html

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Prof. Dr. Walter Pfeiffer
Universitaet Bielefeld
Fakultaet fuer Physik
Ultrakurzzeitspektroskopie
Postfach 10 01 31
33501 Bielefeld
Tel.: +49-521-106-5470
Fax: +49-521-106-6001
email: pfeiffer@physik.uni-bielefeld.de
web: http://www.physik.uni-bielefeld.de/experi/d4/index.html
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Information zum Mailverteiler: Alle Studierenden der Fakultaet fuer Physik