Fig. 1. Flow chart of fabrication of MgF₂ microdisk resonator

Fig. 2. Diagrams of MgF₂ microdisk resonator chamfering. (a) Schematic of MgF₂ microdisk resonator chamfering; (b) MgF₂ microdisk resonator with chamfering

Fig. 3. MgF₂ microdisk resonator after rough polishing. (a) Realistic figure of microresonator after rough polishing; (b) characterization of microresonator sidewall morphology

Fig. 4. MgF₂ microdisk resonator after fine polishing. (a) Realistic figure of smooth sidewall of microresonator; (b) characterization of local roughness of microresonator sidewall

Fig. 5. Diagram of ultra-high quality factor testing system based on tapered fiber coupling for MgF₂ microdisk resonator

Fig. 6. Transmission of MgF₂ microdisk resonator. (a) Microresonator transmission spectrum; (b) ringdown fitting curve