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Q: Fachverband Quantenoptik und Photonik

Q 59: Poster IV

Q 59.33: Poster

Donnerstag, 9. März 2023, 16:30–19:00, Empore Lichthof

Compact Optical Test Mass Sensing — •Victor Huarcaya — Albert-Einstein-Institut Hannover / Max-Planck-Institut für Gravitationsphysik, Hannover, Germany

High-precision measurement of all six degrees of freedom of freely floating test masses is necessary for gravitational space missions like GRACE (Gravity Recovery and Climate Experiment), its follow-on mission GRACE-FO, and GOCE (Gravity Field and steady-state Ocean Circulation Explorer). When aiming for sensing multiple degrees of freedom, typically, capacitive sensing is used, which facilitates a compact setup but does not provide competitive precision. In opposition, laser interferometers have been established as one of the tools of choice for high-precision measurement schemes. However, these measurements were restricted to the length changes in one degree of freedom. Here, we report on Deep Frequency Modulation (DFM). This novel interferometric readout technique is a promising candidate for improving the sensitivity beyond capacitance readout systems and reducing the complexity of the setup. Initial experimental results show optical zero measurements performance levels better than 250  pm/√Hz at 1 mHz and electronic readout noise levels below 1  pm/√Hz at 1 mHz. Based on DFM, we also report a novel sensor topology, the self-referenced single-element dual-interferometer (SEDI) inertial sensor, which takes simplification one step further by accommodating two interferometers in one optic which makes the SEDI sensor a promising approach for applications in high precision inertial sensing for both next-generation space-based gravity missions.