SAMOP 2023 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 47: Precision Measurements with Optical Clocks (joint session Q/QI)
Q 47.3: Vortrag
Donnerstag, 9. März 2023, 11:45–12:00, E001
Instability investigation for a dual-wavelength coating frequency stabilization cavity — •Fabian Dawel1,2, Alexander Wilzewski1,2, Johannes Kramer1,2, Lennart Pelzer1,2, Marek Hild1,2, Kai Dietze1,2, Gayatri Sasidharan1,2, Nicolas Spethmann1, and Piet O. Schmidt1,2 — 1QUEST Institute for Experimental Quantum Metrology, Physikalisch-Technische Bundesanstalt, 38116 Braunschweig — 2Leibniz Universität Hannover, 30167 Hannover
Optical resonators are a key tool for stabilizing lasers. For many experiments space is limited, so it is advantageous to lock multiple lasers to the same resonator. But so far, the correlation in noise contributions for two or more lasers on the same mirror pair has not been investigated. In this talk we present the stabilization of two lasers operating at 729 nm and 1069 nm on one mirror pair. We measure the effect of photo-thermal noise (PTN) and residual-amplitude modulation (RAM) on laser frequency instability. We find correlations between optical power and frequency. The wavelength coating stack next to the substrate shows PTN noise which is suppressed by coherent cancelation to a level of 3×10−8 Hz/W. The stack on top of this shows a PTN of 7×10−7 Hz/W. As expected, there is no significant cross-correlation between the lasers for noise induced by RAM. We measured relative frequency instabilities of less than 10−14 for both lasers, where the instability of one laser is limited by RAM. This work shows that dual-wavelength coatings can be used for highly stable laser applications, which makes it a viable tool for precision spectroscopy experiments.