2023

• H. Kassab, S. Gröbmeyer, W. Schweinberger, C. Hofer, P. Steinleitner, M. Högner, T. Amotchkina, D. Gerz, M. Knorr, R. Huber, N. Karpowicz, I. Pupeza, “In-line synthesis of multi-octave phase-stable infrared light,” Optics Express 31, 24862 (2023).

2022

• 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).
• T. Vogel, A. Omar, S. Mansourzadeh Ashkani, F. Wulf, N. Sabanés, M. Müller, T. Seifert, A. Weigel, G. Jakob, M. Kläui, I. Pupeza, T. Kampfrath, C. Saraceno “Average power scaling of THz spintronic emitters in reflection geometry,” Optics Express 30, 20451 (2022).
• Q. Bournet, F. Guichard, M. Natile, Y. Zaouter, M. Joffre, A. Bonvalet, I. Pupeza, C. Hofer, F. Druon, M. Hanna, P. Georges, “Enhanced intrapulse difference frequency generation in the mid-infrared by a spectrally dependent polarization state,” Optics Letters 47, 261 (2022).

2021

• A. Weigel, P. Jacob, D. Gröters, T. Buberl, M. Huber, M. Trubetskov, J. Heberle, I. Pupeza, “Ultra-rapid electro-optic sampling of octave-spanning mid-infrared waveforms,” Optics Express 29, 20747-20764 (2021).
• 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).

2020

• J. Schötz, B. Förg, W. Schweinberger, I. Liontos, H. A. Masood, A. M. Kamal, C. Jakubeit, N. G. Kling, T. Paasch-Colberg, S. Biswas, M. Högner, I. Pupeza, M. Alharbi, A. M. Azzeer, M. F. Kling, “Phase-matching for generation of isolated attosecond xuv and soft-x-ray pulses with few-cycle drivers,” Physical Reviews X 10, 041011 (2020).
• S. Mitra, S. Biswas, J. Schötz, E. Pisanty, B. Förg, G. Kavuri, C. Burger, W. Okell, M. Högner, I. Pupeza, V. Pervak, M. Lewenstein, P. Wnuk, M. Kling, “Suppression of individual peaks in two-colour high harmonic generation,” Journal of Physics B: Atomic, Molecular and Optical Physics 53, 134004 (2020).
• M. Huber, M. Trubetskov, S.A. Hussain, W. Schweinberger, C. Hofer, I. Pupeza, “Optimum sample thickness for trace analyte detection with field-resolved infrared spectroscopy,” Analytical Chemistry 92, 7508–7514 (2020).
• 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).

2019

• T. Butler, N. Lilienfein, J. Xu, N. Nagl, C. Hofer, D. Gerz, K.F. Mak, C. Gaida, T. Heuermann, M. Gebhardt, J. Limpert, F. Krausz, I. Pupeza, “Multi-octave spanning, Watt-level ultrafast mid-infrared source,” Journal of Physics: Photonics 1, 044006 (2019) [Invited paper, Special Issue “Focus on Nonlinear Optics in the Mid-Infrared Region”].
• T. Amotchkina, M. Trubetskov, S.A. Hussain, D. Hahner, D. Gerz, M. Huber, W. Schweinberger, I. Pupeza, F. Krausz, V. Pervak “Broadband dispersive Ge/YbF₃ mirrors for mid-infrared spectral range,” Optics Letters 44, 5210 (2019).
• B.-H. Chen, C. Hofer, I. Pupeza, P. Baum, “Second-harmonic generation and self-phase modulation of few-cycle mid-infrared pulses,” Optics Letters 44, 4079 (2019).
• M. Högner, T. Saule, S. Heinrich, N. Lilienfein, D. Esser, M. Trubetskov, V. Pervak, I. Pupeza, “Cavity-enhanced noncollinear high-harmonic generation,” Optics Express 27, 19675 (2019).
• D. Gerz, W. Schweinberger, T.P. Butler, T. Siefke, M. Heusinger, T. Amotchkina, V. Pervak, U.D. Zeitner, I. Pupeza, “Mid-infrared long-pass filter for high-power applications based on grating diffraction,” Optics Letters 44, 3014 (2019).
• T.P. Butler, D. Gerz, C. Hofer, J. Xu, C. Gaida, T. Heuermann, M. Gebhardt, L. Vamos, W. Schweinberger, J. Gessner, T. Siefke, M. Heusinger, U.D. Zeitner, A. Apolonski, N. Karpowicz, J. Limpert, F. Krausz, I. Pupeza, “Watt-scale 50-MHz source of single-cycle waveform-stable pulses in the molecular fingerprint region,” Optics Letters 44, 1730 (2019).
• M. Högner, T. Saule, I. Pupeza, “Efficiency of Cavity-Enhanced High Harmonic Generation with Geometric Output Coupling,” Journal of Physics B: Atomic, Molecular and Optical Physics 52, 075401 (2019).
• W. Schweinberger, L. Vamos, J. Xu, S.A. Hussain, C. Baune, S. Rode, I. Pupeza, “Interferometric delay tracking for low-noise Mach-Zehnder-type scanning measurements,” Optics Express 27, 4789-4798 (2019).
• T. Buberl, P. Sulzer, A. Leitenstorfer, F. Krausz, I. Pupeza, “Broadband interferometric subtraction of optical fields,” Optics Express 27, 2432 (2019).
• 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).

2018

• C. Gaida, M. Gebhardt, T. Heuermann, F. Stutzki, C. Jauregui, J. Antonio-Lopez, A. Schülzgen, R. Amezcua-Correa, A. Tünnermann, I. Pupeza, J. Limpert, “Watt-scale super-octave mid-infrared intrapulse difference frequency generation,” Light: Science & Applications, 7, 94 (2018).
• C. Gaida, T. Heuermann, M. Gebhardt, E. Shestaev, T.P. Butler, D. Gerz, N. Lilienfein, P. Sulzer, M. Fischer, R. Holzwarth, A. Leitenstorfer, I. Pupeza, J. Limpert, “High-power frequency comb at 2 μm wavelength emitted by a Tm-doped fiber laser system,” Optics Letters 43, 5178 (2018).
• T. Saule, M. Högner, N. Lilienfein, O. de Vries, M. Plötner, V. Yakovlev, N. Karpowicz, J. Limpert, I. Pupeza, “Cumulative Plasma Effects in Cavity-Enhanced High-Order Harmonic Generation,” Applied Physics Letters – Photonics 3, 101301 (2018).
• J. Xu, B. Globisch, C. Hofer, N. Lilienfein, T. Butler, N. Karpowicz, I. Pupeza, “Three-octave terahertz pulses from optical rectification of 20-fs, 1-μm, 78-MHz pulses in GaP,” Journal of Physics B: Atomic, Molecular and Optical Physics 51, 154002 (2018) [Invited paper, Special Issue “Ultrafast Spectroscopy: fundamentals”].
• S. Breitkopf, N. Lilienfein, T. Achtnich, C. Zwyssig, A. Tünnermann, I. Pupeza, J. Limpert, “Velocity- and pointing-error measurements of a 300 000 r/min self-bearing permanent-magnet motor for optical applications,” Review of Scientific Instruments 89, 063110 (2018).
• M. Högner, T. Saule, N. Lilienfein, V. Pervak, I. Pupeza, “Tailoring the Transverse Mode of a High-Finesse Optical Resonator with Stepped Mirrors,” Journal of Optics 20, 024003 (2018).

2017

• M. Huber, W. Schweinberger, F. Stutzki, J. Limpert, I. Pupeza, O. Pronin, “Active intensity noise suppression for a broadband mid-infrared laser source,” Optics Express 25, 22499 (2017).
• M. Högner, V. Tosa, I. Pupeza, “Generation of Isolated Attosecond Pulses with Enhancement Cavities – a Theoretical Study,” New Journal of Physics 19, 033040 (2017).
• N. Lilienfein, C. Hofer, S. Holzberger, C. Matzer, P. Zimmermann, M. Trubetskov, V. Pervak, I. Pupeza, “Enhancement cavities for few-cycle pulses,” Optics Letters 42, 271-274 (2017).
• T. Saule, S. Holzberger, O. De Vries, M. Plötner, J. Limpert, A. Tünnermann, I. Pupeza, “Phase-stable, multi-µJ femtosecond pulses from a repetition-rate tunable Ti:Sa-oscillator-seeded Yb-fiber amplifier,“ Applied Physics B 123, 17 (2017) [“Enlightening the World with the Laser” – Honoring T. W. Hänsch, Topical Collection].
• N. Lilienfein, S. Holzberger, I. Pupeza, “Ultrafast optomechanical pulse picking,“ Applied Physics B 123, 47 (2017) [“Enlightening the World with the Laser” – Honoring T. W. Hänsch, Topical Collection].

2016

• S. Breitkopf, S. Wunderlich, T. Eidam, E. Shestaev, S. Holzberger, T. Gottschall, H. Carstens, A. Tünnermann, I. Pupeza, J. Limpert, “Extraction of enhanced, ultrashort laser pulses from a passive 10-MHz stack-and-dump cavity,“ Applied Physics B 122, 297 (2016) [“Enlightening the World with the Laser” – Honoring T. W. Hänsch, Topical Collection].
• 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).

2015

• S. Breitkopf, T. Eidam, A. Klenke, H. Carstens, S. Holzberger, E. Fill, T. Schreiber, F. Krausz, A. Tuennermann, I. Pupeza, J. Limpert, “Stack and dump: Peak-power scaling by coherent pulse addition in passive cavities,” Eur. Phys. J. Special Topics 224, 2573–2577 (2015).
• 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).
• O. de Vries, T. Saule, M. Plötner, F. Lücking, T. Eidam, A. Hoffmann, A. Klenke, S. Hädrich, J. Limpert, S. Holzberger, T. Schreiber, R. Eberhardt, I. Pupeza, A. Tünnermann, “Acousto-optic pulse picking scheme with carrier-frequency-to-pulse-repetition-rate synchronization,” Optics Express 23, 19586-19595 (2015).
• S. Holzberger, N. Lilienfein, H. Carstens, T. Saule, F. Luecking, M. Trubetskov, V. Pervak, T. Eidam, J. Limpert, E. Fill, F. Krausz, I. Pupeza, “Femtosecond enhancement cavities in the nonlinear regime,” Physical Review Letters 115, 023902 (2015).
• S. Holzberger, N. Lilienfein, M. Trubetskov, H. Carstens, F. Luecking, V. Pervak, F. Krausz, I. Pupeza, “Enhancement cavities for zero-offset-frequency pulse trains,” Optics Letters 40, 2165-2168 (2015).
• N. Lilienfein, H. Carstens, S. Holzberger, C. Jocher, T. Eidam, J. Limpert, A. Tünnermann, A. Apolonski, F. Krausz, I. Pupeza, “Balancing of thermal lenses in enhancement cavities with transmissive elements,” Optics Letters 40, 843-846 (2015).
• J. Weitenberg, P. Russbueldt, I. Pupeza, Th. Udem, H.-D. Hoffmann, R. Poprawe, “Geometrical on-axis access to high-finesse resonators by quasi-imaging: a theoretical description,” Journal of Optics 17, 025609 (2015).

2014

• S. Breitkopf, T. Eidam, A. Klenke, L. von Grafenstein, H. Carstens, S. Holzberger, E. Fill, Th. Schreiber, F. Krausz, A. Tuennermann, I. Pupeza, J. Limpert, “A concept for multiterawatt fibre lasers based on coherent pulse stacking in passive cavities,” Light-Science & Applications 3, e211 (2014).
• H. Carstens, N. Lilienfein, S. Holzberger, C. Jocher, T. Eidam, J. Limpert, A. Tuennermann, J. Weitenberg, D.C. Yost, A. Alghamdi, Z. Alahmed, A. Azzeer, A. Apolonski, E. Fill, F. Krausz, I. Pupeza, “Megawatt-scale average-power ultrashort pulses in an enhancement cavity,” Optics Letters 39, 2595 (2014).
• I. Pupeza, M. Högner, J. Weitenberg, S. Holzberger, D. Esser, T. Eidam, J. Limpert, A. Tuennermann, E. Fill, V.S. Yakovlev, “Cavity-Enhanced High-Harmonic Generation with Spatially Tailored Driving Fields,” Physical Review Letters 112, 103902 (2014).

2013

• D. Esser, J. Weitenberg, W. Broering, I. Pupeza, S. Holzberger, H.-D. Hoffmann, “Laser-manufactured mirrors for geometrical output coupling of intracavity-generated high harmonics,” Optics Express 21, 26797 (2013).
• I. Pupeza, S. Holzberger, T. Eidam, H. Carstens, D. Esser, J. Weitenberg, P. Russbueldt, J. Rauschenberger, J. Limpert, Th. 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).
• H. Carstens, S. Holzberger, J. Kaster, J. Weitenberg, V. Pervak, A. Apolonski, E. Fill, F. Krausz, I. Pupeza, ”Large-mode enhancement cavities,” Optics Express 21, 11606 (2013).

2012

• B. Bernhardt, A. Ozawa, A. Vernaleken, I. Pupeza, J. Kaster, Y. Kobayashi, R. Holzwarth, E. Fill, F. Krausz, T.W. Haensch, Th. Udem, “Vacuum ultraviolet frequency combs generated by a femtosecond enhancement cavity in the visible,” Optics Letters 37, 503 (2012).

2011

• I. Pupeza, E. Fill, F. Krausz, “Low-loss VIS/IR-XUV beam splitter for high-power applications,” Optics Express 19, 12108 (2011).
• J.Weitenberg, P. Russbueldt, T. Eidam, I. Pupeza, ”Transverse mode tailoring in a quasi-imaging high-finesse femtosecond enhancement cavity,” Optics Express 19, 9551 (2011).
• Y.-Y. Yang, F. Sussmann, S. Zherebtsov, I. Pupeza, J. Kaster, D. Lehr, H.-J. Fuchs, E.-B. Kley, E. Fill, X.-M. Duan, Z.-S. Zhao, F. Krausz, S.L. Stebbings, M.F. Kling, “Optimization and characterization of a highly-efficient diffraction nanograting for MHz XUV pulses,” Optics Express 19, 1954 (2011).
• N. Krumbholz, T. Hochrein, N. Vieweg, I. Radovanovic, I. Pupeza, M. Schubert, K. Kretschmer, M. Koch, “Degree of Dispersion of Polymeric Compounds Determined With Terahertz Time-Domain Spectroscopy,” Polymer Engineering And Science 51, 109 (2011).

2010

• I. Pupeza, X. Gu, E. Fill, T. Eidam, J. Limpert, A. Tuennermann, F. Krausz, Th. Udem, “Highly sensitive dispersion measurement of a high-power passive optical resonator using spatial-spectral interferometry,” Optics Express 18, 26184- 26195 (2010).
• I. Pupeza, T. Eidam, J. Rauschenberger, B. Bernhardt, A. Ozawa, E. Fill, A. Apolonski, Th. Udem, J. Limpert, Z. Alahmed, A.M. Azzeer, A. Tuennermann, T.W. Haensch, F. Krausz, “Power scaling of a high-repetition-rate enhancement cavity,” Optics Letters 35, 2052 (2010).
• M.A. Salhi, I. Pupeza, M. Koch, “Confocal THz Laser Microscope,” Journal Of Infrared Millimeter And Terahertz Waves 31, 358 (2010).
• C. Joerdens, K.L. Chee, I. Al-Naib, I. Pupeza, S. Peik, G. Wenke, M. Koch, “Dielectric Fibres for Low-Loss Transmission of Millimetre Waves and its Application in Couplers and Splitters,” Journal Of Infrared Millimeter And Terahertz Waves 31, 214 (2010).
• S. Immervoll, R. Loewen, I. Pupeza, “A local characterization of smooth projective planes,” Proceedings Of The American Mathematical Society 138, 323 (2010).

2008

• T. Kleine-Ostmann, T. Schrader, M. Bieler, U. Siegner, C. Monte, B. Gutschwager, J. Hollandt, A. Steiger, L. Werner, R. Muller, G. Ulm, I. Pupeza, M. Koch, “THz metrology,” Frequenz 62, 135 (2008).
• R. Wilk, I. Pupeza, R. Cernat, M. Koch, “Highly accurate THz time-domain spectroscopy of multilayer structures,” IEEE Journal Of Selected Topics In Quantum Electronics 14, 392 (2008).

2007

• I. Pupeza, R. Wilk, M. Koch, “Highly accurate optical material parameter determination with THz time-domain spectroscopy,” Optics Express 15, 4335 (2007).

2006

• I. Pupeza, A. Kavcic, L. Ping, “Efficient Generation of Interleavers for IDMA,” 2006 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS, VOLS 1-12 Book Series: IEEE International Conference on Communications, pages: 1508-1513 (2006).