Th. Udem

14.1k total citations · 9 hit papers
92 papers, 9.5k citations indexed

About

Th. Udem is a scholar working on Atomic and Molecular Physics, and Optics, Electrical and Electronic Engineering and Spectroscopy. According to data from OpenAlex, Th. Udem has authored 92 papers receiving a total of 9.5k indexed citations (citations by other indexed papers that have themselves been cited), including 86 papers in Atomic and Molecular Physics, and Optics, 34 papers in Electrical and Electronic Engineering and 26 papers in Spectroscopy. Recurrent topics in Th. Udem's work include Advanced Fiber Laser Technologies (68 papers), Advanced Frequency and Time Standards (31 papers) and Laser-Matter Interactions and Applications (30 papers). Th. Udem is often cited by papers focused on Advanced Fiber Laser Technologies (68 papers), Advanced Frequency and Time Standards (31 papers) and Laser-Matter Interactions and Applications (30 papers). Th. Udem collaborates with scholars based in Germany, United States and Russia. Th. Udem's co-authors include Theodor W. Hänsch, Ronald Holzwarth, Johannes Reichert, P. St. J. Russell, J. C. Knight, W. J. Wadsworth, Ferenc Krausz, Christoph Gohle, Vladislav S. Yakovlev and Michael Hentschel and has published in prestigious journals such as Nature, Science and Physical Review Letters.

In The Last Decade

Th. Udem

88 papers receiving 8.9k citations

Hit Papers

5 papers align trajectories

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

Optical frequency metrology

2002 2.1k citations Th. Udem, Ronald Holzwarth et al. Nature profile →
Attosecond control of electronic processes by intense light fields

2003 1.1k citations Andrius Baltuška, Th. Udem et al. Nature profile →
Optical Frequency Synthesizer for Precision Spectroscopy

2000 840 citations Ronald Holzwarth, Th. Udem et al. Physical Review Letters profile →
Absolute Optical Frequency Measurement of the CesiumD1Line with a Mode-Locked Laser

1999 521 citations Th. Udem, Johannes Reichert et al. Physical Review Letters profile →
An Optical Clock Based on a Single Trapped ¹⁹⁹ Hg ⁺ Ion

2001 460 citations Th. Udem et al. profile →
A 920-Kilometer Optical Fiber Link for Frequency Metrology at the 19th Decimal Place

2012 371 citations Katharina Predehl, Gesine Grosche et al. profile →
Measuring the frequency of light with mode-locked lasers

1999 284 citations Johannes Reichert, Ronald Holzwarth et al. Optics Communications profile →
Accurate measurement of large optical frequency differences with a mode-locked laser

1999 250 citations Th. Udem, Johannes Reichert et al. Optics Letters profile →
Phase-Coherent Measurement of the Hydrogen1S−2STransition Frequency with an Optical Frequency Interval Divider Chain

1997 241 citations Th. Udem, Johannes Reichert et al. Physical Review Letters profile →

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name	h						Papers	Cites
Th. Udem Germany	36	9.0k	4.4k	1.9k	771	486	92	9.5k
Scott A. Diddams United States	69	17.3k 1.9×	11.4k 2.6×	2.4k 1.3×	365 0.5×	654 1.3×	365	18.6k
Thomas Udem Germany	25	4.1k 0.5×	2.2k 0.5×	1.0k 0.5×	460 0.6×	180 0.4×	101	4.5k
L. Hollberg United States	51	11.3k 1.3×	3.5k 0.8×	1.5k 0.8×	130 0.2×	460 0.9×	240	12.2k
William C. Swann United States	44	7.5k 0.8×	4.5k 1.0×	2.3k 1.2×	96 0.1×	259 0.5×	128	8.4k
S. Schiller Germany	43	5.4k 0.6×	1.6k 0.4×	1.2k 0.6×	400 0.5×	180 0.4×	176	6.2k
R.E. Drullinger United States	29	4.0k 0.4×	1.2k 0.3×	895 0.5×	129 0.2×	484 1.0×	103	4.7k
A. Clairon France	39	5.2k 0.6×	822 0.2×	648 0.3×	212 0.3×	752 1.5×	150	5.6k
F. Biraben France	33	3.6k 0.4×	532 0.1×	849 0.4×	469 0.6×	545 1.1×	121	4.2k
A. Javan United States	42	3.5k 0.4×	2.8k 0.6×	2.4k 1.3×	121 0.2×	177 0.4×	127	5.6k
A. Szöke United States	37	2.8k 0.3×	1.2k 0.3×	1.1k 0.6×	476 0.6×	54 0.1×	110	4.3k

Countries citing papers authored by Th. Udem

Since Specialization

Citations

This map shows the geographic impact of Th. Udem's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Th. Udem with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Th. Udem more than expected).

Fields of papers citing papers by Th. Udem

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Th. Udem. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Th. Udem. The network helps show where Th. Udem may publish in the future.

Co-authorship network of co-authors of Th. Udem

This figure shows the co-authorship network connecting the top 25 collaborators of Th. Udem. A scholar is included among the top collaborators of Th. Udem based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Th. Udem. Th. Udem is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

Sort: Min cites: Since: Top N: Style:

20 of 20 papers shown

Zhao, Fei, G. Lo Curto, L. Pasquini, et al.. (2020). Measuring and characterizing the line profile of HARPS with a laser frequency comb. Astronomy and Astrophysics. 645. A23–A23. 14 indexed citations

Hernández, J. I. Gónzalez, R. Rébolo, L. Pasquini, et al.. (2020). The solar gravitational redshift from HARPS-LFC Moon spectra. Astronomy and Astrophysics. 643. A146–A146. 20 indexed citations

Droste, Stefan, Filip Ozimek, Th. Udem, et al.. (2013). Optical-Frequency Transfer over a Single-Span 1840 km Fiber Link. Physical Review Letters. 111(11). 110801–110801. 200 indexed citations

Probst, Rafael A., T. Steinmetz, T. Wilken, et al.. (2013). Nonlinear amplification of side-modes in frequency combs. Optics Express. 21(10). 11670–11670. 20 indexed citations

Curto, G. Lo, L. Pasquini, A. Manescau, et al.. (2012). Astronomical Spectrograph Calibration at the Exo-Earth Detection Limit. The Messenger. 149. 2. 6 indexed citations

Reinhardt, S., et al.. (2010). Two-photon direct frequency comb spectroscopy with chirped pulses. Physical Review A. 81(3). 15 indexed citations

Herrmann, M. G., Valentin Batteiger, S. Knünz, et al.. (2009). Frequency Metrology on Single Trapped Ions in the Weak Binding Limit: The3s1/2−3p3/2Transition inMg+24. Physical Review Letters. 102(1). 13006–13006. 44 indexed citations

Herrmann, M. G., F. Kottmann, D. Leibfried, et al.. (2009). Feasibility of coherent xuv spectroscopy on the1S−2Stransition in singly ionized helium. Physical Review A. 79(5). 97 indexed citations

Kolachevsky, N., Arthur Matveev, Jānis Alnis, et al.. (2009). Testing the Stability of the Fine Structure Constant in the Laboratory. Space Science Reviews. 148(1-4). 267–288. 8 indexed citations

10.

Murphy, M. T., Th. Udem, Ronald Holzwarth, et al.. (2007). High-precision wavelength calibration with laser frequency combs. arXiv (Cornell University). 8 indexed citations

11.

Apolonski, A., Péter Dombi, G. G. Paulus, et al.. (2004). Observation of Light-Phase-Sensitive Photoemission from a Metal. Physical Review Letters. 92(7). 73902–73902. 145 indexed citations

12.

Baltuška, Andrius, M. Uiberacker, Michael Hentschel, et al.. (2004). Phase-controlled amplification of few-cycle laser pulses. The HKU Scholars Hub (University of Hong Kong). 369. 430–430. 6 indexed citations

13.

Baltuška, Andrius, Th. Udem, M. Uiberacker, et al.. (2003). Attosecond control of electronic processes by intense light fields. Nature. 421(6923). 611–615. 1145 indexed citations breakdown →

14.

Hänsch, Theodor W., Ronald Holzwarth, M. Zimmermann, & Th. Udem. (2002). MEASURING THE FREQUENCY OF LIGHT WITH ULTRA SHORT PULSES. 88–96.

15.

Nevsky, A., Ronald Holzwarth, Johannes Reichert, et al.. (2001). Frequency comparison and absolute frequency measurement of I2-stabilized lasers at 532 nm. Optics Communications. 192(3-6). 263–272. 51 indexed citations

16.

Holzwarth, Ronald, A. Nevsky, M. Zimmermann, et al.. (2001). Absolute frequency measurement of iodine lines with a femtosecond optical synthesizer. Applied Physics B. 73(3). 269–271. 57 indexed citations

17.

Holzwarth, Ronald, et al.. (2000). Precision spectroscopy with femtosecond light pulses. Quantum Electronics and Laser Science Conference. 109. 2 indexed citations

18.

Zanthier, J. von, Th. Becker, E. Peik, et al.. (1999). Absolute frequency measurement of the In+ 5s S0–5s5p P0 transition. Optics Communications. 166(1-6). 57–63. 30 indexed citations

19.

Udem, Th., Johannes Reichert, Ronald Holzwarth, & Theodor W. Hänsch. (1999). Accurate measurement of large optical frequency differences with a mode-locked laser. Optics Letters. 24(13). 881–881. 250 indexed citations breakdown →

20.

Udem, Th., Johannes Reichert, Ronald Holzwarth, & Theodor W. Hänsch. (1999). Absolute Optical Frequency Measurement of the CesiumD1Line with a Mode-Locked Laser. Physical Review Letters. 82(18). 3568–3571. 521 indexed citations breakdown →

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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