Advancing ultrafast laser-based trARPES sources by cascaded high-harmonic generation in hollow-core fibers.

Successful time- and angle-resolved photoelectron spectroscopy (trARPES) experiments rely on optimizing trade-offs such as pulse duration, energy resolution, photon flux and repetition rate when generating ultrashort probe pulses in the VUV range [1]. A promising combination of these parameters is cascaded high-harmonic generation by four-wave mixing in a hollow-core fiber [2]. trARPES measurements recently demonstrated the potential of this source [3]. Here, we present our progress in implementing a source that optimizes pulse duration and repetition rate. The complexity of the setup and its output parameters lie between those obtained by upconversion in crystals and in gases. We will outline the scientific cases such a versatile photon source will unlock.



[1] K. Na, A. K. Mills, D. J. Jones, Phys. Rep. 1036, 1 (2023).

[2] D. E. Couch, D. D. Hickstein, D. G. Winters, S. J. Backus, M. S. Kirchner, S. R. Domingue, J. J. Ramirez, C. G. Durfee, M. M. Murnane, and H. C. Kapteyn, Optica 7, 832 (2020).

[3] L. Hellbrück, M. Puppin, F. Guo, D. D. Hickstein, S. Benhabib, M. Grioni, J. Hugo Dil, T. LaGrange, H. M. Rønnow, F. Carbone, Rev. Sci. Instrum. 95, 033007 (2024).