Generation and Characterization of Intense Attosecond Pulses

University essay from Lunds universitet/Atomfysik; Lunds universitet/Fysiska institutionen

Abstract: Research on ultrafast dynamics in atoms and molecules requires short pulses. In order to resolve processes taking place on a femtosecond timescale sufficiently, these pulses require a duration on the attosecond time scale. This thesis is about the generation of such attosecond pulses via high harmonic generation (HHG) in argon gas by a terawatt infrared (IR) laser source. The pulses are applied in a pump-probe principle on two different noble gases, helium and neon. Reconstruction of Attosecond Beating By Interference of Two-photon Transition (RABBIT) is performed to characterize the relative emission time delay between harmonics, and to reconstruct the temporal domain of the attosecond pulse. Methods used for analyzing and improving the data extraction are introduced. Particularly the angle-resolved analysis gives unique insights into the ionization dynamics.

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