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O: Fachverband Oberflächenphysik

O 34: Poster Tuesday: Scanning Probe Techniques 2

O 34.9: Poster

Dienstag, 6. September 2022, 11:00–13:00, P3

Development and characterization of a Herriott-type multipass cell compression-setup for fs-pulses and variable repetition rates — •Lasse Sternemann¹, Karl Schiller¹, Alan Omar², Matija Stupar¹, Mirko Cinchetti¹, and Clara Saraceno² — ¹Department of Physics, TU Dortmund University, Otto-Hahn-Straße 4, 44227 Dortmund, Germany — ²Ruhr-Universitaet Bochum, Germany

We present developement and characterization of a Herriott-style multipass cell aimed at achieving ultrashort pulses with high peak power. The setup is used as a driving laser for a high repetition rate HHG (High Harmonic Generation) source for time-resolved momentum microscopy.

The setup compresses the pulses generated by a commercial Ytterbium-based laser (Carbide, Light Conversion) with an average power of 50 W and a variable repetition rate between 100 kHz and 1 MHz. The pulses are first spectrally broadened by self-phase-modulation by passing through a non-linear χ⁽³⁾ medium multiple times. Then, a pair of negative group-dispersion-delay coated mirrors compress the pulse by dispersion correction. By moving the non-linear medium within the mulitpass cell we were able to compress the pulses from 242 fs to around 45 fs for different high repetition rates while keeping a transmission of over 90 % and peak powers between 1 GW and 2 GW [1].

[1] A. Omar, et al. Advanced Solid State Lasers, OSA Technical Digest (Optical Society of America, 2021), paper JM3A.55