Microwavephysics and Atmospheric Physics
Biomedizinische Photonik
Ultrafast Science and Technology
HS 2018  ·  FS 2018
HS 2017  ·  FS 2017
HS 2016  ·  FS 2016
HS 2015  ·  FS 2015
HS 2014  ·  FS 2014
HS 2013  ·  FS 2013
HS 2012  ·  FS 2012
Last update: 22.11.2018
HS 2018: Seminare über Ultrafast Science and Technology
Thursday 11:15am
Vorträge, die innerhalb der nächsten Tage stattfinden, sind speziell markiert.
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Donnerstag, 20.09.2018

No seminar

Zeit: 11:15 Uhr
Hörsaal: B116
 

 
Donnerstag, 27.09.2018

Vibrational Dynamics of Metal Complexes in Different Electronic and Redox States

Zeit: 11:15 Uhr
Hörsaal: B116
 
Prof. Dr. Anthony Vlcek School of Biological and Chemical Sciences
Queen Mary University of London UK

Changing the electronic state redistributes electron density in a molecule while oxidation and reduction change its total electron count. Each of these processes affects the molecular structure, vibrational dynamics and coupling, as well as solvation; and these changes are clearly manifested in time-resolved and 2-dimensional IR spectroscopy. Photon absorption is followed by relaxation processes that result in by IR bands shifting and changing shape on a picosecond time scale. Oxidation or reduction often have similar vibrational effects as excitation, while 2D-IR spectroscopy shows that solvation dynamics depends on the oxidation state. These effects will be demonstrated using time-resolved and 2D IR spectra of rhenium and ruthenium – based molecular photosensitizers.

 
Donnerstag, 04.10.2018

No seminar

Zeit: 11:15 Uhr
Hörsaal: B116
 

 
Donnerstag, 11.10.2018

No seminar

Zeit: 11:15 Uhr
Hörsaal: B116
 

 
Donnerstag, 18.10.2018

No seminar

Zeit: 11:15 Uhr
Hörsaal: B116
 

 
Donnerstag, 25.10.2018

Dielectric Laser Acceleration - Theory, Applications and Experiments at SwissFEL (PSI)

Zeit: 11:15 Uhr
Hörsaal: B116
 
Benedikt Hermann, PhD Student, University of Bern/Paul Scherrer Institute PSI

In classical radio-frequency particle accelerators gradients are ultimately limited by the brake-down effect inside the cavity. At optical frequencies dielectric materials (e.g. fused silica, SiO2) can sustain surface electric fields 1-2 orders of magnitude higher than metals. A dielectric laser accelerator (DLA) is a periodic microstructure excited by light in the optical or NIR domain. Due to recent developments in laser technology, commercial laser systems are capable of producing femto-second laser pulses with peak-field amplitudes in the GV/m range in a compact device. In experiments at SLAC and UCLA average gradients of 850 MeV/m have been observed [1]. This talk will cover the concept of DLAs, their applications and experiments at SwissFEL in the scope of the Accelerator on a Chip International Program (ACHIP). [1] D. Cesar et al., High-field nonlinear optical response and phase control in a dielectric laser accelerator, 2018, https://www.nature.com/articles/s42005-018-0047-y

 
Donnerstag, 01.11.2018

No seminar

Zeit: 11:15 Uhr
Hörsaal: B116
 

 
Donnerstag, 08.11.2018

No seminar

Zeit: 11:15 Uhr
Hörsaal: B116
 

 
Donnerstag, 15.11.2018

Unconventional fiber optics technologies for novel nanostructured fibers, pulse-preserving nonlinear fibers and inhibited coupling air core fibers

Zeit: 11:15 Uhr
Hörsaal: B116
 
Prof. Mariusz Klimczak, Institute of Electronic Materials Technology, University of Warsaw, Poland

I will provide an overview of current specialty fiber optics research and development undertaken at Institute of Electronic Materials Technology in Warsaw, Poland. The fiber core nanostructurization through a modified stack and draw technique, fundamentally anchored in the effective medium theory, has enabled us to demonstrate either passive or rare-earth doped, arbitrary refractive index gradient fibers. This novel technology is compatible with either silica or various soft glass platforms. We have designed and developed a series of nonlinear soft glass photonic crystal fibers with engineered normal dispersion profiles, which have found application in generation of coherent supercontinuum seed signals for ultrafast fiber amplifiers, investigated intensively at Institute of Applied Physics at University of Bern. I will discuss these fiber structures in context of their experimentally verified supercontinuum pulse preservation performance. Finally, I will present our results in the technology and characterization of ultrashort pulse handling properties of inhibited coupling hollow core fibers. In the recent years, these so called anti-resonant fibers have attracted considerable momentum due to a unique combination of transmission, dispersion and nonlinear properties, which make them an important candidate for the next generation experimental platform for ultrafast and extreme nonlinear optics.

 
Donnerstag, 22.11.2018

No seminar

Zeit: 11:15 Uhr
Hörsaal: B116
 

 
Donnerstag, 29.11.2018

No seminar

Zeit: 11:15 Uhr
Hörsaal: B116
 

 
Donnerstag, 06.12.2018

No seminar

Zeit: 11:15 Uhr
Hörsaal: B116
 

 
Donnerstag, 13.12.2018

No seminar

Zeit: 11:15 Uhr
Hörsaal: B116
 

 
Donnerstag, 20.12.2018

No seminar

Zeit: 11:15 Uhr
Hörsaal: B116