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Q: Fachverband Quantenoptik und Photonik

Q 62: Precision Measurements: Gravity II

Q 62.5: Vortrag

Freitag, 10. März 2023, 12:00–12:15, E214

Deep Frequency Modulation Interferometry for test mass readout — •Stefano Gozzo — Albert Einstein Institute Hannover

The new generation of space-based experiments for gravitational wave detection and geodesy comes with a number of technological challenges. The design of future space-based interferometers will have to comply with sub-pm/*Hz sensitivity requirements at low frequencies while providing multi-fringe dynamic range and minimizing the complexity of the optical set up configuration.

The Deep Frequency Modulation Interferometry (DFMI) technique aims at simplifying the standard interferometric readout by replacing it with an exclusively digital phasemeter. An introduction to the DFMI technique will be given in this talk.

While DFMI allows to reduce the amount of optical component, space-based gravity field recovery missions usually require a two interferometer set up. The unequal length arm nature of space-based interferometers makes them sensitive to frequency noise, so that an additional interferometer for frequency stabilization purposes is needed. In order to minimize the complexity of such an optical set up, we developed a Single Element Double Interferometer (SEDI) design. A single piece optical element hosts an unequal armlength interferometer probing the position of a test mass and an internal reference interferometer.

The combination of a SEDI with a DFMI readout is a promising scheme to achieve minimal optical complexity while complying with the initial sensitivity goal, and its performances are currently being tested in the AEI Hannover laboratories.