60 fs, 1030 nm FEL pump-probe laser based on a multi-pass post-compressed Yb:YAG source.

Anne-Lise Viotti,Skirmantas Alisauskas,Bastian Manschwetus,Ingmar Hartl,Ammar Bin Wahid,Nora Schirmel,Christoph M Heyl,Prannay Balla

doi:10.1107/s1600577520015052

Anne-Lise Viotti, Skirmantas Alisauskas + Show 6 more

Open Access

https://doi.org/10.1107/s1600577520015052

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Abstract

This paper reports on nonlinear spectral broadening of 1.1 ps pulses in a gas-filled multi-pass cell to generate sub-100 fs optical pulses at 1030 nm and 515 nm at pulse energies of 0.8 mJ and 225 µJ, respectively, for pump-probe experiments at the free-electron laser FLASH. Combining a 100 kHz Yb:YAG laser with180 W in-burst average power and a post-compression platform enables reaching simultaneously high average powers and short pulse durations for high-repetition-rate FEL pump-probe experiments.

Highlights

The bright pulses of X-ray free-electron lasers (FELs) allow ultrafast measurements in the extreme ultraviolet (XUV) and soft X-ray regimes with femtosecond time resolution, providing exciting opportunities to study ultrafast dynamics within multiple research fields including physics, chemistry and biology (Abramczyk, 2005; Zewail, 2000; Seddon et al, 2017)
This paper reports on nonlinear spectral broadening of 1.1 ps pulses in a gasfilled multi-pass cell to generate sub-100 fs optical pulses at 1030 nm and 515 nm at pulse energies of 0.8 mJ and 225 mJ, respectively, for pump–probe experiments at the free-electron laser FLASH
The optical pulses used for FEL pump–probe experiments are transported to the FLASH2 modular optical delivery setups (MODs) close to the user experiments via a

Summary

Introduction

The bright pulses of X-ray free-electron lasers (FELs) allow ultrafast measurements in the extreme ultraviolet (XUV) and soft X-ray regimes with femtosecond (fs) time resolution, providing exciting opportunities to study ultrafast dynamics within multiple research fields including physics, chemistry and biology (Abramczyk, 2005; Zewail, 2000; Seddon et al, 2017) Such experiments are often carried out using so-called pump–probe techniques: a first light pulse (in the infrared, visible, ultraviolet or X-ray regime) is used to initiate a dynamical process such as, for example, a chemical reaction or a phase transition in the sample under study, followed by a second pulse at a well defined time-delay to probe the system response. The wavelength range of this OPCPA system can be extended, for example by utilizing harmonic frequency conversion or parametric

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