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Development and characterization of a femtosecond-pulse compressor


Ackermann,  Alexander
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Ackermann, A. (2019). Development and characterization of a femtosecond-pulse compressor. Master Thesis, Ruprecht-Karls-Universität, Heidelberg.

Cite as: https://hdl.handle.net/21.11116/0000-0004-F473-7
For ultrahigh precision spectroscopy of highly charged ions, an infrared frequency
comb is translated into the ultraviolet region by high harmonic generation in a gas
target in the focus region of an intra-vacuum femtosecond enhancement cavity. To
reach the required intensity of 1013W=cm2 at a pulse repetition rate of 100 MHz,
the initially 24 ps long pulses with 10Wof average power pass a chirped amplification
stage to reach 80W of average power at less than 200 fs pulse duration. The
pulse compression with either a grating or grating prism (GRISM) compressor
and pulse characterization by frequency resolved optical gating (FROG) is the
subject of this thesis.
Based on simulated pulses that mimic experimental ones, an error of the reconstructed
dispersion parameters was calculated for each experimental FROG trace
Utilizing the GRISM compressor, pulses of 150 fs temporal FWHM were demonstrated
at 6.5W average output power. With increasing power the compression
and beam profile worsened, due to thermal lensing in the prism.
Using the grating compressor, a pulse duration of 223 fs at an average output
power of 69W in combination with a slightly distorted beam profile was achieved.
Furthermore, experimental quantitative dispersion measurements agreed within
1δ with the theory.