A laser device small enough to fit on a table can now measure distances smaller than the width of a single atom.
This compact optical resonator-based technique achieves sub-femtometer precision in measuring displacement. The system maintains this accuracy across a massive range of ten orders of magnitude. Most precision sensors of this caliber require giant underground facilities like those used to detect gravitational waves. Bringing this level of sensitivity to a compact device will revolutionize how we build everything from microchips to deep-space navigation tools. It effectively gives scientists a ruler that can measure the most minute vibrations in the universe. This marks a new era for ultra-precise manufacturing and scientific observation.
Demonstration of a compact optical resonator-based displacement sensing technique with sub-femtometer precision
arXiv · 2605.03435
We demonstrate sub-femtometer displacement-sensing results achieved with a compact optical resonator-based laser interferometry technique called heterodyne cavity-tracking, intended for local displacement or inertial sensing with ultra-high sensitivity. Displacement sensing at this sensitivity is required for ambitious improvements to current gravitational-wave detectors and to enable future ground- and space-based observatories. The optical topology employs a centimeter-scale dynamic cavity inc