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Gonzalez Hernandez I, J.; Rebolo, R.; Pasquini, L.; Lo Curto, G.; Molaro, P.; Caffau, E.; Ludwig, H.-G.; Steffen, M.; Esposito, M.; Suarez Mascareno, A. et al.; Toledo-Padron, B.; Probst, R. A.; Hänsch, T. W.; Holzwarth, R.; Manescau, A.; Steinmetz, T.; Udem, T.; Wilken, T.: The solar gravitational redshift from HARPS-LFC Moon spectra A test of the general theory of relativity. Astrophysics & Astronomy 643, A146 (2020)

Grinin, A.; Matveev, A. N.; Yost, D. C.; Maisenbacher, L.; Wirthl , V.; Pohl, R.; Hänsch, T. W.; Udem, T.: Two-photon frequency comb spectroscopy of atomic hydrogen. Science 370 (6520), pp. 1061 - 1066 (2020)

Diddams, S. A.; Vahala, K.; Udem, T.: Optical frequency combs: Coherently uniting the electromagnetic spectrum. Science 369 (6501), p. 267 - 267 (2020)

Probst, R. A.; Milakovic, D.; Toledo-Padron, B.; Lo Curto, G.; Avila, G.; Brucalassi, A.; Canto Martins, B. L.; Leao, I. d. C.; Esposito, M.; Gonzalez Hernandez I, J. et al.; Grupp, F.; Hänsch, T. W.; Kellermann, H.; Kerber, F.; Mandel, O.; Manescau, A.; Pozna, E.; Rebolo, R.; de Medeiros, J. R.; Steinmetz, T.; Suarez Mascareno, A.; Udem, T.; Urrutia, J.; Wu , Y.; Pasquini, L.; Holzwarth, R.: A crucial test for astronomical spectrograph calibration with frequency combs. Nature astronomy 2020 (2020)

Giunta, M.; Hänsel, W.; Fischer, M.; Lezius, M.; Udem, T.; Holzwarth, R.: Real-time phase tracking for wide-band optical frequency measurements at the 20th decimal place. Nature Photonics; Nature Publ. Group , London [u.a.] 14 (1), pp. 44 - 49 (2020)

Schmid, F.; Weitenberg, J.; Hänsch, T. W.; Udem, T.; Ozawa, A.: Simple phase noise measurement scheme for cavity-stabilized laser systems. Optics Letters 44 (11), pp. 2709 - 2712 (2019)

Udem, T.; Maisenbacher, L.; Matveev, A. N.; Andreev, V.; Grinin, A.; Beyer, A.; Kolachevsky, N.; Pohl, R.; Yost, D. C.; Hänsch, T. W.: Quantum Interference Line Shifts of Broad Dipole-Allowed Transitions. Annalen der Physik 531 (5), 1900044 (2019)

Ann , B.-m.; Schmid, F.; Krause, J.; Hänsch, T. W.; Udem, T.; Ozawa, A.: Motional resonances of three-dimensional dual-species Coulomb crystals. Journal of Physics B: Atomic, Molecular and Optical Physics 52 (3), 035002 (2019)

Ozawa, A.; Davila-Rodriguez, J.; Hänsch, T. W.; Udem, T.: Quantum Zeno Effect assisted Spectroscopy of a single trapped Ion. Scientific Reports 8, 10643 (2018)

Udem, T.: Quantum electrodynamics and the proton size. Nature Physics 14 (6), p. 632 - 632 (2018)

Beyer, A.; Maisenbacher, L.; Matveev, A. N.; Pohl, R.; Khabarova, K.; Grinin, A.; Lamour, T.; Yost, D. C.; Hänsch, T. W.; Kolachevsky, N. et al.; Udem, T.: The Rydberg constant and proton size from atomic hydrogen. Science 358 (6359), pp. 79 - 85 (2017)

Weitenberg, J.; Vernaleken, A.; Schulte, J.; Ozawa, A.; Sartorius, T.; Pervak, V.; Hoffmann, H.-D.; Udem, T.; Russbüldt, P.; Hänsch, T. W.: Multi-pass-cell-based nonlinear pulse compression to 115 fs at 7.5 µJ pulse energy and 300 W average power. Optics Express 25 (17), pp. 20502 - 20510 (2017)

Ozawa, A.; Davila-Rodriguez, J.; Bounds, J. R.; Schüssler, H. A.; Hänsch, T. W.; Udem, T.: Single ion fluorescence excited with a single mode of an UV frequency comb. Nature Communications 8, 44 (2017)

Pohl, R.; Nez, F.; Udem, T.; Antognini, A.; Beyer, A.; Fleurbaey, H.; Grinin, A.; Hänsch, T. W.; Julien, L.; Kottmann, F. et al.; Krauth, J. J.; Maisenbacher, L.; Matveev, A.; Biraben, F.: Deuteron charge radius and Rydberg constant from spectroscopy data in atomic deuterium. Metrologia 54 (2), pp. L1 - L10 (2017)

Probst, R. A.; Steinmetz, T.; Wu , Y.; Grupp, F.; Udem, T.; Holzwarth, R.: A compact echelle spectrograph for characterization of astro-combs. Applied Physics B: Lasers and Optics 123 (3), 76 (2017)

Udem, T.; Ozawa, A.: Mode locking based on the temporal Talbot effect. Applied Physics B: Lasers and Optics 123 (4), 100 (2017)

Esslinger, T.; Picqué, N.; Udem, T.: "Enlightening the World with the Laser" - Honoring T. W. Hänsch. Applied Physics B: Lasers and Optics 122 (11), 283 (2016)

Beyer, A.; Maisenbacher, L.; Matveev, A. N.; Pohl, R.; Khabarova, K.; Chang , Y.; Grinin, A.; Lamour, T.; Shi, T.; Yost, D. C. et al.; Udem, T.; Hänsch, T. W.; Kolachevsky, N.: Active fiber-based retroreflector providing phase-retracing anti-parallel laser beams for precision spectroscopy. Optics Express 24 (15), pp. 17470 - 17485 (2016)

Seidel, M.; Brons, J.; Lücking, F.; Pervak, V.; Apolonskiy, A.; Udem, T.; Pronin, O.: Carrier-envelope-phase stabilization via dual wavelength pumping. Optics Letters 41 (8), pp. 1853 - 1856 (2016)

Yost, D. C.; Matveev, A. N.; Grinin, A.; Peters, E.; Maisenbacher, L.; Beyer, A.; Pohl, R.; Kolachevsky, N. N.; Khabarova, K.; Hänsch, T. W. et al.; Udem, T.: Spectroscopy of the hydrogen 1S-3S transition with chirped laser pulses. Physical Review A 93 (4), 042509 (2016)