Hannover 2016 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 67: Laser Applications II
Q 67.2: Talk
Friday, March 4, 2016, 14:45–15:00, a310
Experimental research on tilt-to-length coupling for future geodesy mission — •Yong Ho Lee1,2, Sönke Schuster1,2, Daniel Schütze1,2, Michael Tröbs1,2, Gudrun Wanner1,2, Gerhard Heinzel1,2, and Kasten Danzmann1,2 — 1Max Planck Institute for Gravitational Physics (Albert Einstein Institute) — 2Leibniz Universität Hannover
The GRACE satellites measure Earth's gravity field very successfully since 2002, but will soon reach the end of their lifetime. The next generation Earth gravity observer - GRACE Follow-On - will be launched in 2017 and will carry for the first time a Laser Ranging Interferometer (LRI) to validate that laser interferometry can significantly enhance the measurement precision. We are already now preparing for future geodesy missions beyond GRACE Follow-On, by addressing the main noise sources of the LRI. Roughly 50% of the LRI noise are allocated to tilt-to-length (TTL) coupling noise, which results from the coupling of angular satellite jitter into the interferometer phase readout.
In this talk, we will introduce the characteristics of TTL coupling noise. In addition, our theoretical and experimental work for suppressing the TTL noise will be explained.