Freiburg 2024 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 46: Lasers I
Q 46.4: Vortrag
Donnerstag, 14. März 2024, 11:45–12:00, HS 3118
8-Fold Energy Upscaling by Divided-Pulse Spectral Broadening in a Multi-Pass-Cell — •Henrik Schygulla1,2, Nayla Jimenez1, 3, 4, Yujiao Jiang1, Hüseyin Çankaya1, Ingmar Hartl1, and Marcus Seidel1,3,4 — 1DESY, Hamurg, Deutschland — 2Uni Hamburg, Deutschland — 3Helmholtz Institute Jena, Deutschland — 4GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Deutschland
Multi-pass-cells (MPC) offer an excellent spectral broadening method, but a current challenge is its peak power scalability [1]. To resolve this, we divided the input pulse [2] into 8 replicas and demonstrated a corresponding increase of pulse energy after nonlinear compression.
The used laser generated 208fs pulses at 1030nm with a pulse energy of up to 140uJ. The input pulse was divided into 8 replicas using 3 calcite crystals and sent through the MPC for spectral broadening to a 45fs bandwidth limit. Afterwards, the replicas were recombined with an identical set of crystals and compressed via chirped mirrors. A duration of 49fs after compression was measured by FROG. The nonlinear compression performance of a single 17uJ pulse and the 140uJ pulse train was compared: The polarisation cleaning losses for the divided-pulse setting were 5%, the pulse duration remained the same.
These results enable switching laser repetition rates for FLASH pump-probe experiments [3] without compromising the pulse duration.
[1] Viotti et al. Optica 9, 197 (2022); [2] Stark et al. J. Phys. Photonics 4, 035001 (2022); [3] Viotti et al. Rev. Sci. Instr. 94, 023002 (2023)
Keywords: Multi-Pass-Cell; Spectral-Broadening; Divided-Pulse; Coherent-Combining; Nonlinear-Compression