• S. A. Hussain, C. Hofer, M. Högner, W. Schweinberger, T. Buberl, D. Bausch, M. Huber, F. Krausz, I. Pupeza, “Sub-attosecond-precision optical-waveform stability measurements using electro-optic sampling,” Scientific Reports 14, 20869 (2024).
• A. Weigel, P. Jacob, W. Schweinberger, M. Huber, M. Trubetskov, P. Karandušovský, C. Hofer, T. Buberl, T. Amotchkina, M. Högner, D. Hahner, P. Sulzer, A. Leitenstorfer, V. Pervak, F. Krausz, I. Pupeza, “Dual-oscillator infrared electro-optic sampling with attosecond precision,” Optica 11, 726-735 (2024).
• M. Peschel, M. Högner, T. Buberl, D. Keefer, R. de Vivie-Riedle, I. Pupeza, “Sub-Optical-Cycle Light-Matter Energy Transfer in Molecular Vibrational Spectroscopy,” Nature Communications 13, 5897 (2022).
• P. Sulzer, M. Högner, A.-K. Raab, L. Fürst, E. Fill, D. Gerz, C. Hofer, L. Voronina, I. Pupeza, “Cavity-enhanced field-resolved spectroscopy,” Nature Photonics 16, 692 (2022).
• S. Heinrich, T. Saule, M. Högner, Y. Cui, V. Yakovlev, I. Pupeza, U. Kleineberg, “Attosecond intra-valence band dynamics and resonant-photoemission delays in W(110),” Nature Communications 12, 3404 (2021).
• I. Pupeza, C. Zhang, M. Högner, J. Ye, “Extreme-ultraviolet frequency combs for precision metrology and attosecond science,” Nature Photonics 15, 175–186 (2021).
• I. Pupeza, M. Huber, M. Trubetskov, W. Schweinberger, S.A. Hussain, C. Hofer, K. Fritsch, M. Poetzlberger, L. Vamos, E. Fill, T. Amotchkina, K.V. Kepesidis, A. Apolonski, N. Karpowicz, V. Pervak, O. Pronin, F. Fleischmann, A. Azzeer, M. Zigman, F. Krausz, “Field-resolved infrared spectroscopy of biological systems,” Nature 577, 52 (2020).
• T. Saule, S. Heinrich, J. Schötz, N. Lilienfein, M. Högner, O. de Vries, M. Plötner, J. Weitenberg, D. Esser, J. Schulte, P. Rußbüldt, J. Limpert, M. F. Kling, U. Kleineberg, I. Pupeza, “High-Flux, Ultrafast Extreme-Ultraviolet Photoemission Spectroscopy at 18.4 MHz Pulse Repetition Rate,” Nature Communications 10, 458 (2019).
• N. Lilienfein, C. Hofer, T. Saule, M. Högner, M. Trubetskov, V. Pervak, E. Fill, C. Riek, A. Leitenstorfer, J. Limpert, F. Krausz, I. Pupeza, “Temporal solitons in free-space femtosecond enhancement cavities,” Nature Photonics 13, 214 (2019).
• H. Carstens, M. Högner, T. Saule, S. Holzberger, N. Lilienfein, A. Guggenmos, C. Jocher, T. Eidam, D. Esser, V. Tosa, V. Pervak, J. Limpert, A. Tuennermann, U. Kleineberg, F. Krausz, I. Pupeza, “High-harmonic generation at 250 MHz with photon energies exceeding 100 eV,” Optica 3, 366-369 (2016).
• I. Pupeza, D. Sánchez, J. Zhang, N. Lilienfein, M. Seidel, O. Pronin, N. Karpowicz, T. Paasch-Colberg, I. Znakovskaya, V. Pervak, E. Fill, Z. Wei, F. Krausz, A. Apolonski, J. Biegert, “High-power sub-2-cycle mid-infrared pulses at 100 MHz repetition rate,” Nature Photonics 9, 721-724 (2015).
• I. Pupeza, S. Holzberger, T. Eidam, H. Carstens, D. Esser, J. Weitenberg, P. Russbueldt, J. Rauschenberger, J. Limpert, T. Udem, A. Tuennermann, T.W. Haensch, A. Apolonski, F. Krausz, E. Fill, “Compact high-repetition-rate source of coherent 100 eV radiation,” Nature Photonics 7, 608 (2013).

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