Optical microcavity can confine photons to a tiny scale for a long time, and is an integrated, low-loss, small mode volume resonant cavity. The resonant frequency of WGM microcavities can be tuned by changing the refractive index and size of the cavity.Based on previous research, this paper proposes a micro-mushroom-shaped microcavity and illustrates the preparation method and characteristics of optical micro-mushroom cavities made of quartz materials. Through the photo-thermal effect, heated light was injected in along the handle of the micro-mushroom cavity, and the frequency tuning of the micro-cavity was thus achieved through the photo-thermal-optical conversion.
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