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A. Schumer, Y. Liu, J. Leshin, L. Ding, Y. Alahmadi, A. Hassan, H. Nasari, S. Rotter, D. Christodoulides, P. Likamwa, M. Khajavikhan:
"Topological modes in a laser cavity through exceptional state transfer";
Science, 375 (2022), 6583; S. 884 - 888.

Shaping the light emission characteristics of laser systems is of great importance in various areas of science and technology. In a typical lasing arrangement, the transverse spatial profile of a laser mode tends to remain self-similar throughout the entire cavity. Going beyond this paradigm, we demonstrate here how to shape a spatially evolving mode such that it faithfully settles into a pair of bi-orthogonal states at the two opposing facets of a laser cavity. This was achieved by purposely designing a structure that allows the lasing mode to encircle a non-Hermitian exceptional point while deliberately avoiding non-adiabatic jumps. The resulting state transfer reflects the unique topology of the associated Riemann surfaces associated with this singularity. Our approach provides a route to developing versatile mode-selective active devices and sheds light on the interesting topological features of exceptional points.

http://dx.doi.org/10.1126/science.abl6571

https://www.science.org/doi/10.1126/science.abl6571