Experimental demonstration of phase-matching and Sagnac effect in a millimeter-scale wedged resonator gyroscope

TL;DR

This paper experimentally demonstrates phase-matching and the Sagnac effect in a millimeter-scale wedged resonator gyroscope, showing potential for compact, chip-based inertial sensing devices.

Contribution

It provides the first experimental verification of phase-matching and Sagnac effect in a small-scale WGM resonator gyroscope, introducing a bidirectional pump-probe scheme for rotation measurement.

Findings

Successful observation of Sagnac effect in a millimeter-scale resonator

Linear relationship between beat frequency and rotation velocity

Distinguishable clockwise and counterclockwise rotations

Abstract

The highly efficient coupling of light from conventional optical components to optical mode volumes lies in the heart of chip-based micro-devices, which is determined by the phase-matching between propagation constants of fiber taper and the whispering-gallery-mode (WGM) of the resonator. Optical gyroscopes, typically realized as fiber-optic gyroscopes and ring-laser gyroscopes, have been the mainstay in diverse applications such as positioning and inertial sensing. Here, the phase-matching is theoretically analyzed and experimentally verified. We observe Sagnac effect in a millimeter-scale wedged resonator gyroscope which has attracted considerable attention and been rapidly promoted in recent years. We demonstrate a bidirectional pump and probe scheme, which directly measures the frequency beat caused by the Sagnac effect. We establish the linear response between the detected beat frequency and the rotation velocity. The clockwise and counterclockwise rotation can also be distinguished according to the value of the frequency beat. The experimental results verify the feasibility of developing gyroscope in WGM resonator system and pave the way for future development.