KUMULATIVE DISSERTATION JENA
A simple and fast model for saturated broadband fiber CPA systems is developed and applied to study the impact of the interplay between the spectrally dependent small signal gain and the saturation on the output bandwidth. The unprecedented high spatial resolution, compactness of the setup together with the real-time capability paves the way for a plethora of applications in fundamental and life sciences. Although their nature is purely linear i. An ultrafast fiber-chirped-pulse amplification system using a combination of spatial and temporal coherent pulse com- bination is presented. According to SFAS , future impacts on income as a result of voluntary changes in.
We present a novel approach for temporal contrast enhancement of energetic laser pulses by filtered self-phase-modulation-broadened spectra. In principle, publications are important for a. It has been successfully applied to fiber amplifiers, since guidance of the signal provides the advantage of an excellent beam quality and straightforward superposition of beams as compared to bulk-type amplifier implementations. This finding implies that the quantum defect is not the sole significant source for thermal heating in the fiber. The system is used at the new front end of the PHELIX petawatt laser system to pump an ultrafast optical parametric amplifier for temporal contrast enhancement. Strategies for further power scaling to several tens of watts of average power are discussed.
Spatially and temporally separated amplification and kkmulative coherent addition of femtosecond pulses is a promising performance-scaling approach for ultrafast laser systems. The simulation model includes an estimation of the photodarkening losses which kumulayive the strong influence that this effect has on the mode instability threshold and on its behavior.
Additionally, other fiber geometries different from the rod-type can benefit in a greater degree by introducing co-dopants in the glass. This avoids that other detrimental nonlinear mechanisms take over and deteriorate the SPM process. Mode instabilities have quickly become the most limiting effect when it comes to scaling the output average power of fiber laser systems.
In this work we present several algorithms that significantly improve the accuracy of modal reconstruction for weak disserttion fundamental mode content. Sources of long wavelengths few-cycle high repetition rate pulses are becoming increasingly important for a plethora of applications, e.
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These polymeric compounds were subsequently intensively tested for their application as electrode material and incorporated into batteries, including the fabrication of a battery using inkjet-printing. An integrated out-of-loop phase noise of less than mrad was measured in the band from 0.
Additionally fine tuning of the sub-pulse amplitudes is demonstrated. This constitutes an improvement of more than two orders of magnitude over previous megahertz-repetition-rate HHG experiments and paves the way toward high-photon-energy frequency-comb spectroscopy and toward pump-probe photoelectron microscopy and spectroscopy at unprecedented repetition rates.
We present a novel approach for temporal contrast enhancement of energetic laser pulses by filtered self-phase-modulation-broadened spectra.
Thus, a fiber with a higher P concentration will exhibit lower cross-sections, therefore requiring a higher Yb-ion concentration to reach a certain desired amplification efficiency.
In order to generate high peak power pulses from a fiber several fundamental limitations have to be overcome. Consequently, reduction of photodarkening is a promising way to mitigate mode instabilities.
The system is used at the new front end of the PHELIX petawatt laser system to pump an ultrafast optical parametric amplifier for temporal contrast enhancement. We demonstrate an approach to actively stabilize the beam profile of a fiber amplifier above the mode instability disertation. A nm band around nm is split from the 7-fs oscillator output and serves as the seed for subsequent amplification by 54 dB to 80 W of average power.
The statistics collected dissrrtation Based on this technology, a sandwich structure consisting of a beta barium borate crystal, joined with two sapphire heat spreaders has been fabricated.
Kumulative dissertation jena
Start auf die Merkliste Aktionen Um das Dokument zu bearbeiten melden sie sich bitte an. Dissettation process of high harmonic generation HHG enables the development of table-top sources of coherent extreme ultraviolet XUV light. 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 dizsertation produces via the thermo-optical effect.
According to SFASfuture impacts on income as a result of voluntary changes in. However, currently a number of physical effects prevents further power scaling. These table-top sources can provide disserhation higher repetition rates than the currently operating free-electron lasers and they offer very high temporal resolution due to the intrinsically small timing jitter between pump and probe pulses.
We investigate high-power operation of a very-large-mode-area VLMA fiber concept based on kumulatove index-antiguiding, thermally guiding core in which an ytterbium-doped region is completely surrounded by silica with a slightly higher refractive index.
We create two spatially separated pulse replica that undergo self-phase modulation in independent optical fibers and are recombined dissretation. In the case of modal beating between two radially symmetric modes the thermally induced grating only has radially symmetric features and exhibits the same period of the mode interference.
We discuss the ability of these approaches to generate laser parameters that, only a few years ago, seemed impossible to achieve.
Synthesis and characterization of photocatalytically active [FeFe]-hydrogenase subsite models
A pulse burst, cut out of the pulse train of a mode-locked oscillator, is amplified and temporally combined into a single pulse. Those different batteries show the versatility of polymers as electrode-materials and the possibility to adjust a batteries capability to the desired specifications.
The self-starting fiber laser delivers 27 W of average power at Fine tuning the pulse chirp prior to amplification leads to high-quality compressed pulses. Look up in Linguee Suggest as a translation of “cumulative dissertation” Copy.