Environmentally Stabilized Crystalline WGM Resonator

We report on the development of a packaged optical whispering-gallery-mode (WGM) resonator exhibiting ultralow acceleration sensitivity. The fractional frequency shift was measured to be on the order of $10^-10/g along the vertical axis and 10^-11/g along the horizontal axes. The resonator, operating in the optical domain with an intrinsic quality factor of Q 10^9, was employed for laser frequency stabilization. The resulting laser exhibited a relative frequency stability at the 3* 10^-12 level for a 10~ms integration time. These results highlight the potential of optical WGM resonators as compact, mechanically robust frequency references for precision photonic systems