Welcome to the Group of Theoretical Physics 2

Kathy LüdgeKathy Lüdge

Head of Group

Univ.-Prof. Dr. rer. nat. (habil.) Kathy Lüdge

Secretarys office:

Dagmar Böhme

Tel.: +49 (0) 3677 69 3706


Curiebau, Zi. 320

Postal address:

Technische Universität Ilmenau
Faculty of Mathematics and Natural Sciences
Institute of Physics
Group of Theoretical Physics 2
P.O. Box 10 05 65
98684 Ilmenau

Visiting address:

Weimarer Straße 25
98693 Ilmenau


We investigate dynamical instabilities arising from optical feedback, optical injection or mode coupling in lasers. The carrier dynamics in the gain material (e.g. semiconductor nanostructures) plays a central role. Another research topic concerns the extent to which these optical systems can be used for hardware-based machine learning. We use numerical methods to solve coupled differential equations as well as analytical methods of nonlinear dynamics for bifurcation analysis.

Foto Licht Materie Wechselwirkung Kathy Lüdge

Invited talks

Bild KupplungsstärkeTheoretische Physik 2 - Kathy Lüdge


L. Jaurigue, E. Robertson, J. Wolters, K. Lüdge
Reservoir Computing with Delayed Input for Fast and Easy Optimisation
Entropy 2021, 23(12), 1560

A. Roos, S. Meinecke, K. Lüdge,
Stabilizing Nanolasers via Polarization Lifetime Tuning Sci. Rep. 11, 18558 (2021 )

F. Köster, B. Lingnau, A. Krimlowski, P. Hövel, K. Lüdge:
Collective coherence resonance in networks of optical neurons Phys. Status Solidi B 2021, 2100345 (2021)

https://journals.aps.org/pra/abstract/10.1103/PhysRevA.103.043511J. Hausen, B. Herzog, A. Nelde, S. Meinecke, N. Owschimikow, K. Lüdge:Feedback induced locking in semiconductor lasers with strong amplitude-phase coupling Phys. Rev. A 103, 043511 (2021)

S. Meinecke, K. Lüdge:
Efficient timing jitter simulation for passively mode-locked semiconductor lasers
App. Phys. Lett. 118, 011104 (2021)

F. Köster, D. Ehlert, K. Lüdge:
Limitations of the recall capabilities in delay based reservoir computing systems
Cogn. Comput. 2020, (2020)

TU Ilmenau / Michael Reichel (ari)


The Department of Theoretical Physics 2 offers courses in the framework of the course Technical Physics. This concerns the three Bachelor modules:

Theoretical Physics 1 Theoretical Physics 2 Theoretical Physics 3

as well as the Master modules:

Theoretical Physics, Numerics and Simulation Module Physics of Complex Systems.