From Stress to Success: Demonstrating Ultrahigh Quality Factor Dual-Shell Resonator Gyroscopes with Low Stress Topology

We report a two-fold increase in quality factor offused silica Dual-Shell Gyroscopes (DSG) by implementing a low-stress anchor topology. Although these complex 3D resonators are dynamically balanced in-plane, they can still experience unbalanced out-of-plane stresses at the anchor, leading to energy loss. Through a parametric study, we demonstrate that a hemitoroidal shell topology significantly reduces the out-of-plane stress component, resulting in lower anchor loss compared to conventional hemispherical design topology. A total of 33 resonators across three different topologies were fabricated and experimentally characterized. Resonators employing the low-stress anchor design achieved quality factors exceeding 3 million in the n=2 mode - representing a two-fold increase over previously reported values.