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THU: Thursday Contributed Sessions

THU 13: Poster Session: Applications

THU 13.26: Poster

Thursday, September 11, 2025, 16:30–18:30, ZHG Foyer 1. OG

Active Stabilization of Laser Diode Injection Using a Polarization-Spectroscopy Technique — •Luka Milanovic^1,2, Greg Ferrero^1,2, Robin Oswald^1,3, Thomas Kinder³, Julian Schmidt¹, and Cornelius Hempel^1,2 — ¹ETH Zürich - PSI Quantum Computing Hub, 5232 Villigen PSI, Switzerland — ²Institute of Quantum Electronics, ETH Zürich, Otto-Stern-Weg 1, 8093 Zurich, Switzerland — ³TEM Messtechnik GmbH, 30559 Hanover, Germany

Injection-locking is a powerful technique to amplify laser light while retaining its spectral properties. However, it can be sensitive to fluctuations in seed power, frequency, and diode temperature. Here we present an active stabilization method [1] inspired by the Hänsch-Couillaud technique that continuously monitors the injection-locking condition using only a few standard optical components. The scheme runs in the background, requires no modulation, and significantly improves robustness against environmental changes. We demonstrate reliable locking even under large perturbations to the seed frequency, power, and diode temperature.
[1] Milanovic et al., Rev. Sci. Instrum. 1 May 2025; 96 (5): 053003. https://doi.org/10.1063/5.0249681

Keywords: Injection locking; Laser stabilization; Laser Diode