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.　©　2024　SPIE.