Sonja Unger

2.7k total citations
122 papers, 2.1k citations indexed

About

Sonja Unger is a scholar working on Electrical and Electronic Engineering, Atomic and Molecular Physics, and Optics and Ceramics and Composites. According to data from OpenAlex, Sonja Unger has authored 122 papers receiving a total of 2.1k indexed citations (citations by other indexed papers that have themselves been cited), including 113 papers in Electrical and Electronic Engineering, 56 papers in Atomic and Molecular Physics, and Optics and 32 papers in Ceramics and Composites. Recurrent topics in Sonja Unger's work include Photonic Crystal and Fiber Optics (89 papers), Advanced Fiber Optic Sensors (64 papers) and Advanced Fiber Laser Technologies (51 papers). Sonja Unger is often cited by papers focused on Photonic Crystal and Fiber Optics (89 papers), Advanced Fiber Optic Sensors (64 papers) and Advanced Fiber Laser Technologies (51 papers). Sonja Unger collaborates with scholars based in Germany, Portugal and France. Sonja Unger's co-authors include J. Kirchhof, S. Jetschke, Anka Schwuchow, Martin Leich, V. Reichel, U. Röpke, Hartmut Bartelt, Kay Schuster, Jan Dellith and Jens Kobelke and has published in prestigious journals such as Applied Physics Letters, Optics Letters and Optics Express.

In The Last Decade

Sonja Unger

117 papers receiving 1.9k citations

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
Sonja Unger Germany 25 1.8k 1.1k 596 210 91 122 2.1k
Mikhail M. Bubnov Russia 25 2.0k 1.1× 1.3k 1.2× 418 0.7× 151 0.7× 36 0.4× 216 2.2k
Marc Eichhorn France 25 1.7k 1.0× 1.4k 1.4× 231 0.4× 386 1.8× 39 0.4× 161 2.0k
Xiushan Zhu United States 27 2.5k 1.4× 2.0k 1.9× 410 0.7× 375 1.8× 46 0.5× 87 2.8k
S. G. Kosinski United States 19 911 0.5× 619 0.6× 166 0.3× 179 0.9× 30 0.3× 44 1.3k
Dariusz Pysz Poland 23 1.8k 1.0× 1.3k 1.2× 148 0.2× 125 0.6× 31 0.3× 201 2.2k
Ramu V. Ramaswamy United States 22 1.4k 0.8× 1.0k 1.0× 344 0.6× 162 0.8× 54 0.6× 103 1.6k
J. I. Mackenzie United Kingdom 21 1.2k 0.6× 1.0k 1.0× 105 0.2× 225 1.1× 106 1.2× 102 1.4k
M. Kawachi Japan 31 2.4k 1.3× 795 0.7× 92 0.2× 161 0.8× 70 0.8× 87 2.6k
Sonia M. García‐Blanco Netherlands 19 929 0.5× 648 0.6× 90 0.2× 199 0.9× 80 0.9× 114 1.1k
M. Brenci Italy 21 820 0.4× 501 0.5× 474 0.8× 417 2.0× 54 0.6× 105 1.2k

Countries citing papers authored by Sonja Unger

Since Specialization
Citations

This map shows the geographic impact of Sonja Unger'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 Sonja Unger with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Sonja Unger more than expected).

Fields of papers citing papers by Sonja Unger

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Sonja Unger. 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 Sonja Unger. The network helps show where Sonja Unger may publish in the future.

Co-authorship network of co-authors of Sonja Unger

This figure shows the co-authorship network connecting the top 25 collaborators of Sonja Unger. A scholar is included among the top collaborators of Sonja Unger 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 Sonja Unger. Sonja Unger is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
1.
Kirchhof, J., Sonja Unger, & Jan Dellith. (2018). Viscosity of fluorine-doped silica glasses. Optical Materials Express. 8(9). 2559–2559. 9 indexed citations
2.
Jetschke, S., Sonja Unger, Anka Schwuchow, et al.. (2013). Evidence of Tm impact in low-photodarkening Yb-doped fibers. Optics Express. 21(6). 7590–7590. 14 indexed citations
3.
Dochow, Sebastian, Ines Latka, Martin Becker, et al.. (2012). Multicore fiber with integrated fiber Bragg gratings for background-free Raman sensing. Optics Express. 20(18). 20156–20156. 48 indexed citations
4.
Jetschke, S., Sonja Unger, Martin Leich, & J. Kirchhof. (2012). Photodarkening kinetics as a function of Yb concentration and the role of Al codoping. Applied Optics. 51(32). 7758–7758. 52 indexed citations
5.
Lee, Sejin, et al.. (2012). Multicorelike guidance in a triangular-core hollow optical fiber and spectral evolution of its eigenmode degeneracy. Optics Letters. 37(22). 4759–4759. 2 indexed citations
6.
Jetschke, S., Martin Leich, Sonja Unger, Anka Schwuchow, & J. Kirchhof. (2011). Influence of Tm- or Er-codoping on the photodarkening kinetics in Yb fibers. Optics Express. 19(15). 14473–14473. 22 indexed citations
7.
Becker, Martin, Sven Brückner, Eric Lindner, et al.. (2010). Fiber Bragg grating inscription with UV femtosecond exposure and two beam interference for fiber laser applications. Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE. 7750. 775015–775015. 3 indexed citations
8.
Popp, Andreas, et al.. (2010). Thin-disk-laser-pumped ytterbium-doped fiber laser with an output power in the kW range. Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE. 7721. 772102–772102. 3 indexed citations
9.
Leich, Martin, U. Röpke, S. Jetschke, et al.. (2009). Non-isothermal bleaching of photodarkened Yb-doped fibers. Optics Express. 17(15). 12588–12588. 38 indexed citations
10.
Kirchhof, J., et al.. (2008). Fluorine Containing High-Silica Glasses for Speciality Optical Fibers. Advanced materials research. 39-40. 265–268. 6 indexed citations
11.
Canat, Guillaume, S. Jetschke, Sonja Unger, et al.. (2008). Multifilament-core fibers for high energy pulse amplification at 15 μm with excellent beam quality. Optics Letters. 33(22). 2701–2701. 41 indexed citations
12.
Bartelt, Hartmut, Kay Schuster, Sonja Unger, et al.. (2007). Single-pulse fiber Bragg gratings and specific coatings for use at elevated temperatures. Applied Optics. 46(17). 3417–3417. 33 indexed citations
13.
Unger, Sonja, Anka Schwuchow, Jan Dellith, & J. Kirchhof. (2007). Codoped materials for high power fiber lasers: diffusion behaviour and optical properties. Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE. 6469. 646913–646913. 27 indexed citations
14.
Kirchhof, J., et al.. (2005). Dopant interactions in high-power laser fibers. Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE. 5723. 261–261. 32 indexed citations
15.
Kirchhof, J., Sonja Unger, J. Kobelke, et al.. (2005). Materials and technologies for microstructured high power laser fibers. Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE. 5951. 595107–595107. 18 indexed citations
16.
Kirchhof, J., Sonja Unger, & Anka Schwuchow. (2003). Fiber lasers: materials, structures and technologies. Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE. 4957. 1–1. 18 indexed citations
17.
Adel, P., et al.. (2003). 10 W widely tunable narrow linewidth double-clad fiber ring laser. 591–591. 4 indexed citations
18.
Liem, A., Jens Limpert, Thomas Schreiber, et al.. (2003). Femtosecond fiber CPA system with high average power. 25. 593–594. 1 indexed citations
19.
Kirchhof, J., et al.. (2001). <title>High-power stability of optical fibers for the visible wavelength region</title>. Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE. 4579. 322–333. 1 indexed citations
20.
Zellmer, H., Sonja Unger, P. Albers, et al.. (1995). High-power cw neodymium-doped fiber laser operating at 92 W with high beam quality. Optics Letters. 20(6). 578–578. 84 indexed citations

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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