Such resonators have to be fine-tuned by ion-beam micro-erosion of the glass or by laser ablation in order to be perfectly dynamically balanced. The Q factor is limited by the coating (extremely thin film of gold or platinum) and by fixture losses. ![]() This shell is driven to a flexural resonance by dedicated electrostatic forces generated by electrodes which are deposited directly onto separate fused quartz structures that surround the shell.įor a single-piece design (i.e., the hemispherical shell and stem form a monolithic part ) made from high-purity fused quartz, it is possible to reach a Q factor of over 30-50 million in vacuum, thus the corresponding random walks are extremely low. ![]() The HRG makes use of a small thin solid-state hemispherical shell, anchored by a thick stem.
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