Datensatz

Zusammenfassung

In this work the plasma-induced spectral blueshift of a strong ultrashort laserpulse in the infrared region during high-harmonic-generation has been investigated. The blueshifting is based on a changing refractive index due to the generation of free electrons. Those are generated in the strong lasereld by tunnnel ionization. For this purpose the spectra of the lasereld after the generation of high-harmonics in neon, argon and xenon were taken with a measurement device, designed in the scope of this thesis. To analyse the measured plasma-induced blueshift quantitatively, a simulation based on the Ammosov- Delone-Krainov-model for tunnel-ionisation was created. It will be shown that this spectral shifting depending on the gas pressure is small for neon but for argon and xenon its impact increases due to a lower ionization potential.