Abstract
For the first time, this work investigates the distinct Akhiezer damping (AKE) effects on multi-frequency whispering gallery mode (WGM) resonators to clarify the Q limitations of such wide-frequency covered devices. Based on the Q dynamics from 7 K to 293 K, more significant Q enhancements and stronger Q dependences on temperature were obtained in high-order WGMs, verifying that AKE has limited contributions to the low-order WGMs but becomes dominated in the high-order ones. With AKE greatly suppressed at lower temperatures, the underlying loss sources of low and high-order modes are most likely to be anchor loss and process-induced damage, respectively.
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