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THU: Thursday Contributed Sessions
THU 5: QIP Implementations: Interfaces
THU 5.8: Talk
Thursday, September 11, 2025, 16:00–16:15, ZHG010
Towards laser cooling of erbium crystals — Daniele Amato1,2, Florian Burger1,2, Justus Edelmann1,2, •Nilesh Goel1,2, Andreas Gritsch1,2, Till Nemolclev1,2, Andrew Propper1,2, Stephan Rinner1,2, Stefano Romboni1,2, Kilian Sandholzer1,2, and Andreas Reiserer1,2 — 1Technical University of Munich, TUM School of Natural Sciences, 85748 Garching, Germany — 2Zentrum für QuantumEngineering, ZQE, 85748 Garching, Germany
Thermal management in nanophotonic devices is vital in various research and technology fields, including quantum photonics. This necessitates a consistent measurement and control of temperature within nanophotonic devices. Established methods employ sensors attached to the components, which provide poor spatial resolution and hence hamper the assessment of local heating effects. To address such limitations, we investigate an alternate temperature sensing approach that measures the luminescence of erbium emitters directly incorporated into nanophotonic silicon waveguides. To span the temperature range from 295 K to 2 K, we look at two approaches: thermal activation of non-radiative decay channels above 200 K and thermal depopulation of spin- and crystal-field levels at lower temperatures [1]. To further analyse the applicability of this method, we look at the properties of erbium crystals and laser cooling of solids with erbium dopants. We investigate the efficacy of such a technique for cooling a solid system to enable quantum and optomechanical applications.
[1] Sandholzer, K., et al. Nanophotonics 14, 20250067 (2025).
Keywords: Laser Cooling; Erbium emitters; Thermometry; Silicon; Nanophotonics