Compact Michelson Interferometers with Subpicometer Sensitivity

Jiri Smetana*, Rebecca Walters, Sophie Bauchinger, Amit Singh Ubhi, Sam Cooper, David Hoyland, Richard Abbott, Christoph Baune, Peter Fritchel, Oliver Gerberding, Semjon Köhnke, Haixing Miao, Sebastian Rode, Denis Martynov

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

The network of interferometric gravitational-wave observatories has successfully detected tens of astrophysical signals since 2015. In this paper, we experimentally investigate compact sensors that have the potential to improve the sensitivity of gravitational-wave detectors to intermediate-mass black holes. We use only commercial components, such as sensing heads and lasers, to assemble the setup and demonstrate its subpicometer precision. The setup consists of a pair of Michelson interferometers that use deep frequency modulation techniques to obtain a linear, relative displacement readout over multiple interference fringes. We implement a laser-frequency stabilization scheme to achieve a sensitivity of 0.3 pm / √Hz above 0.1 Hz. The device has also the potential to improve other experiments, such as torsion balances and commercial seismometers.
Original languageEnglish
Article number034040
Number of pages8
JournalPhysical Review Applied
Volume18
Issue number3
DOIs
Publication statusPublished - 15 Sept 2022

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