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Bartz, Peter: Experiments and simulations of the spectral phase of few-cycle fs-laser pulses during supercontinuum generation in a neon gas filled hollow core fiber. 2014
Inhalt
Introduction
Theoretical Background
Representation of light pulses
Representation in time and frequency domain
The envelope function and the phase term
Pulse duration
The nonlinear refractive index
The optical Kerr effect
Complex refractive index, propagation constant and nonlinear parameter
The pulse propagation equation
The Hemholtz equation
1-dimensional approach
Self-phase modulation
Self-steepening
Self-phase modulation
SPM in the time domain
SPM in the frequency domain
Self-steepening
Time-frequency representations
The STFT spectrogram
The Wigner-Ville distribution
Methods
Experiment
Experimental setup
Adjustment of the hollow-core fiber
SPIDER
Numerical simulation
Split-step method
Comparison with literature
Self-phase modulation and self-steepening
Results of the Experiment
The time-resolved photoelectron spectroscopy experiment
Setup
Results with a gas target
Pulse properties in front of the hollow-core fiber
Pulse properties after the hollow-core fiber
The chirped mirror compressor
Dependency on gas pressure and comparison with numerical simulation
Uncertainty of simulation parameters
Spectrum line scans dependent on pressure
Pressure pseudocolor plots
Results of the Numerical Simulation
Effects of the hollow-core fiber on the supercontinuum
Effects of the input laser pulse on the supercontinuum
Input pulse spectral phase
Input pulse spectral amplitude
Optimization of the supercontinuum with the input spectral phase
Nearly bandwidth-limited pulse
Pulse with a spectral phase of the experiment
Consideration of the chirped mirror compressor
Expectations for the experiment
Conclusion and Outlook
Data Archiving
Bibliography
Acknowledgements