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A: Fachverband Atomphysik

A 42: Precision Measurements III (joint session Q/A)

A 42.3: Vortrag

Freitag, 15. März 2024, 15:00–15:15, HS 1221

Enhancing the sensitivity and dynamic range of atom interferometer measurements using an integrated opto-mechanical vibration sensor — •Ashwin Rajagopalan, Ernst M. Rasel, Sven Abend, and Dennis Schlippert — Leibniz Universität Hannover, Institut für Quantenoptik,
Welfengarten 1, 30167 Hannover, Germany

The measurement sensitivity of an atom interferometer (AI) is predominantly impaired by vibrational noise, this is due to its slow measurement rate and relatively small dynamic range. As a first proof of principle, we demonstrated implementing a miniaturized AI compatible opto-mechanical accelerometer to a T = 10 ms AI which resolves measurement ambiguity and measures the local gravitational acceleration with an uncertainty of 4 × 10⁻⁶ ms⁻² after an integration time of 18000 seconds without any vibration isolation. We are now in preparation to implement the next enhanced version of the opto-mechanical accelerometer which is fully integrated with the retro-reflection mirror of the AI, such that the AI and accelerometer share a common inertial reference. This new accelerometer incorporates a Fabry Pérot interferometer with a mirror reflectivity of 99.9 percent for highly sensitive read-out. An efficient vibrational signal read-out scheme has been implemented and first correlation with a state of the art commercial accelerometer has been observed even at sub-Hertz frequencies.

Funded by the DFG EXC2123 QuantumFrontiers - 390837967 supported by the DLR with funds provided by BMWK under Grant No. DLR 50NA2106 (QGyro+) and DFG SFB 1464 TerraQ.