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In recent years, levitated particles of optical traps in vacuum have shownenormous potential in precision sensor development and searching for newphysics. The accuracy of the calibration relating the detected signal toabsolute displacement of the trapped particle is a critical factor for absolutemeasurement performance. In this paper, we suggest and experimentallydemonstrate a novel calibration method for optical tweezers based onfree-falling particles in vacuum, where the gravitational acceleration isintroduced as an absolute reference. Our work provides a calibration protocolwith great certainty and traceability, which is significant in improving theaccuracy of precision sensing based on optically levitated particles.

Displacement calibration of optical tweezers with absolute gravitational acceleration