In consequence, there is an urgent need for effective strategies to mitigate it and, thus, to increase the power threshold at which it appears. Propagation of this laser pulse inside a krypton-filled hollow-core fiber results in significant spectral broadening. Kumulative dissertation kit fau dissertation la gi apigee albert camus essays and research papers assignment on global warming in swaziland uk essay apa yang dimaksud dengan fotoperiodisme sample of a completed business plan. Due to the lack of such radiation sources, several emerging applications can be addressed only with infrared IR -beamlines in large-scale synchrotron facilities, which are limited regarding user access and only partially fulfill these properties. However, this success, which is largely founded on the outstanding characteristics of fibres as an active medium, has only been achieved through researchers around the world striving to overcome many of the limitations imposed by the fibre architecture. According to predictions from numerical simulations, it is experimentally confirmed that dispersion management is crucial to prevent the growth of side pulses and an increase of the energy content in a temporal pedestal surrounding the self-compressed pulse.

The technique offers a unique scaling potential and can be applied to all ultrafast amplification schemes independent of the architecture of the gain medium. The current single-channel laser system presented herein delivers a pulse-peak power of 2 GW and a nearly transform-limited pulse duration of fs in combination with Due to the lack of such radiation sources, several emerging applications can be addressed only with infrared IR -beamlines in large-scale synchrotron facilities, which are limited regarding user access and only partially fulfill these properties. We show that previously reported limits to few-cycle pulse generation from compression of SC spectra generated in conventional PCF possessing one or more zero dispersion wavelengths do not apply for ANDi PCF. The properties, challenges and perspectives of fiber lasers will be discussed. This results in a reduction of the mode-field diameter, but simultaneously in an improvement of the beam quality.

Following this approach, we demonstrate an ultrafast fiber-laser system featuring spatial beam combination of 8 amplifier channels and temporal combination of a burst comprising 4 pulses. They broaden the doctoral candidates’ [ We present a novel approach for temporal contrast enhancement of energetic laser dissertatipn by filtered self-phase-modulation-broadened spectra.

New anode- and cathode-active materials for organic batteries

Studierende, die alle in ihrem Studiengang geforderten [ Experimentally, we investigate HHG in a gas jet of argon, krypton and xenon. The performance, versatility and reliability of our approach allows imaging of complex wavelength-scale structures, including wave guiding effects within these structures, and resolving embedded nanoscale features, which are invisible for electron microscopes. In this paper we show that the origin of mode instabilities can be explained by taking into account the interplay between the temporal evolution of the three-dimensional temperature profile inside of the active fiber and the related waveguide changes that it produces via the thermo-optical effect.


The key challenge of this concept is a fast, purely reflective switching element that allows for the dumping of the enhanced pulse out of the cavity.

New anode- and cathode-active materials for organic batteries – Digitale Bibliothek Thüringen

Furthermore, possible single shot measurements of the gas temperature are evaluated. The certificate contains a list of the modules based on course units and their grades, a reference to the undertaken practical or foreign study semester, the topic, the grade and the names of the examiners of t h e dissertationdossertation he grade of the viva and the average grade of the Bachelor examination.

Results of a numerical optimization reveal that the amplitude stability of the frequency-shifted pulses can be improved by more than 1 order of magnitude and the timing jitter arising from input fluctuations by 2 orders of magnitude by a proper choice of the fiber dispersion. Even though this is an efficient way to mitigate nonlinear effects, maintaining effective single-mode operation, and with it high beam quality, becomes increasingly difficult as the core is enlarged.

However, the low conversion efficiency of lab-based sources imposes either a ddissertation scale laser system or long exposure times, preventing many applications. To obtain a deeper understanding of TMI, the evolution of the strength of the thermally induced refractive index grating with the average output power in a fiber amplifier is experimentally investigated for the first time.

kumulative dissertation jena

Kuulative is to our knowledge the highest average power sub fs kHz-amplifier system reported to date. The process of high harmonic generation allows for coherent transfer of infrared laser light to the extreme ultraviolet spectral range opening a variety of applications.

cumulative dissertation – German translation – Linguee

A proof of principle experiment demonstrates the high power capability of the fabricated structure. The combination of record-high photon flux and high repetition rate paves the way for time-resolved studies of the dissociation dynamics of inner-shell ionized molecules in a coincidence detection scheme. The watt-level laser directly emits chirped pulses with a duration of 1 ps and nJ of pulse energy. This includes the functionalization and optimization of well-known polymers like galvinoxyles and the incorporation of dissertatioj redox-materials in polymeric compounds.


This is a remarkable finding since it opens the door to a significant increase of the average power of fiber laser systems in the near future. It is possible to increase the average power kumulativ, for pulsed kunulative systems, also parameters such as the pulse energy and the peak power.

Ytterbium-doped, rod-type, large-pitch fibres LPF enable extreme fibre dimensions, i. The experiment proves that coherent addition of femtosecond fiber lasers can be efficiently and reliably performed at high B-integral and considerable thermal load in the individual amplifiers.

kumulative dissertation jena

Galvinoxyl- and phenoxyl-compounds are addressed as well as quinones, anthraquinones and nitroxides. We report on a novel approach of performance scaling of ultrafast lasers by means of coherent combination.

Einordnung Gutachter inRezensent in: Start auf die Merkliste Aktionen Um das Dokument zu bearbeiten melden sie sich bitte an. A high-speed mode analysis technique is required to gain fundamental understanding of mode instabilities in high-power fiber laser systems.

Experimental results with a white-light—seeded NOPA agree well with numerical simulations. Particular emphasis will be put on suitable ultrashort pulse kymulative high average power lasers, which directly drive harmonic generation without the need for external enhancement cavities.

We experimentally generated ps and ps long flattop pulses with rising and falling edges shorter than ps. The performance of pulsed fibre laser systems is restricted due to nonlinear effects. Fiber lasers enjoy dlssertation excellent reputation as power-scalable diode-pumped solid-state laser concept.

Synthesis and characterization of photocatalytically active [FeFe]-hydrogenase subsite models

The simulation model includes an estimation of the photodarkening losses which shows the strong influence that this effect has on the mode instability threshold and on its behavior. The FWM process delivers narrow-band pulses at nm and drives a continuum-like spectrum ranging from to nm. The ten times longer cavity affords three essential benefits over former jenaa.