Mainz 2026 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 32: Photonics and Biophotonics II
Q 32.6: Vortrag
Mittwoch, 4. März 2026, 15:45–16:00, P 3
Joule-Thomson Cooling of Light in Photonic Lattices — •Marco Steffen Kirsch1, Giorgos G. Pyrialakos2, Tom A. W. Wolterink1, Alexander Szameit1, Matthias Heinrich1, and Demetri N. Christodoulides2 — 1University of Rostock, Rostock, Germany — 2University of Southern California, Los Angeles, USA
We report the experimental observation of an all-optical analogue of the Joule-Thomson expansion in nonlinear multimode photonic lattices. By injecting light through a single-site throttle into a significantly larger waveguide array, we induce a power-dependent redistribution of modal populations. Increasing input power drives a condensation of energy into the fundamental mode, resulting in a measurable reduction of the system's optical temperature. Our results demonstrate a controllable pathway for optical cooling in multimode environments, offering new tools for managing coherence and beam quality in complex nonlinear photonic systems.
Keywords: Nonlinear Optics; Statistical Physics; Joule-Thomson; Waveguides