Mainz 2026 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 70: Quantum Optics and Control II

Q 70.3: Talk

Friday, March 6, 2026, 11:45–12:00, P 3

Nonlinear excitations in laser driven two level systems — •Deniz Adigüzel, Miriam Gerharz, and Jörg Evers — Max-Planck-Institut für Kernphysik, Heidelberg, Germany

The extreme narrow linewidths of Mössbauer nuclei transitions render precision spectroscopy possible but subsequently make it also very challenging to achieve nonlinear excitations. Recent experiments at X-ray free electron lasers allow one to access new excitation regimes. This makes the study of nonlinearly excited nuclear systems particularly relevant. The interaction in question is a laser driven two level system which can be studied by solving the Maxwell-Bloch equations coupled with the propagation equation. As this system consists of a coupled partial differential equation, the analytical solution is in general not always obtainable. To overcome this problem, we implemented the method of lines to investigate light propagation beyond low excitations numerically. Here we report on the nonlinear timeshifts in the minima of the coherently scattered light and transitions around population inversion. Subsequently a signature was proposed in order to quantify the degree of excitation.

Keywords: Nonlinear excitations; Maxwell-Bloch equations; Light propagation; Mössbauer nuclei; Nuclear resonant scattering