SAMOP 2023 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 7: Poster I
Q 7.14: Poster
Monday, March 6, 2023, 16:30–19:00, Empore Lichthof
Pulse Characterization by Frequency-Resolved Optical Gating (FROG) for Extreme-Ultraviolet (XUV) Frequency Comb Generation — •Fiona Sieber1, Lennart Guth1, Jan-Hendrik Oelmann1, Tobias Heldt1, Simon Angstenberger1, Stepan Kokh1, Janko Nauta1,2, Nick Lackmann1, Nele Griesbach1, Thomas Pfeifer1, and José R. Crespo López-Urrutia1 — 1Max-Planck-Institut for Nuclear Physics, Heidelberg, Germany — 2Department of Physics, Swansea University, Singleton Park, SA2, United Kingdom
The characterization of femtosecond pulses, which play a major role in precision spectroscopy, is challenging due to the lack of an accurate time reference on the ultrafast scale. Therefore the pulse has to be referenced by itself. In the scope of transferring a near-infrared frequency comb with 100 MHz repetition rate to the XUV-regime via high harmonic generation (HHG), 80 W femtosecond pulses are characterized in the time and frequency domain before the HHG stage using a FROG set-up. [1] The pulse is overlapped with a delayed copy of itself in a nonlinear crystal and the generated second harmonic is detected by a Czerny-Turner spectrometer. The shape, duration and power spectral density of the laser pulse are retrieved from the recorded FROG traces (intensities dependent of frequency and delay) using a noise removal protocol and the ePIE algorithm [2].
[1] J. Nauta et al., Optics Express, Vol. 29, No. 2, 2624 (2018)
[2] P. Sidorenko et al., Optica, Vol. 3, No. 12, 1320 (2016)