M. Seidel, Anne-lise Viotti, S. Alisauskas, A. Tajalli, O. Akcaalan, J. Darvill, N. Ekanayake, U. Grosse-Wortmann, C. Li, C. Mohr, F. Pressacco, N. Schirmel, A. Swiderski, H. Tavakol, H. Tünnermann, C. Vidoli, L. Winkelmann, C. Heyl, B. Manschwetus, H. Cankaya, I. Hartl
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Multi-pass cell-based nonlinear pulse compression of Yb:YAG pump-probe lasers at FLASH
The majority of user experiments at the high repetition-rate free electron laser (FEL) facility FLASH are of pump-probe type, combining the extreme ultraviolet (XUV) or soft x-ray radiation from the FEL with ultrashort pulses generated by optical lasers. In this contribution, we demonstrate the advantages of using high-power Yb:YAG lasers with subsequent nonlinear pulse compression stages based on multi-pass cells (MPC). The approach enables the combination of hundreds of kHz to MHz repetition-rates, hundreds of watts of average powers and excellent intensity stabilities. We present the characteristics of the MPC-based pump-probe laser at the FLASH plane-grating beamlines. Furthermore, we report pulse compression to 8.2 fs pulse duration and the seeding of an optical parametric amplifier generating mid-IR radiation tunable from 1.4 µm to 16 µm.
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