Fig. 1. (a) Picture of MgF₂ crystalline resonator; (b) Characterization results of cavity sidewall profile

Fig. 2. Mode electric field distribution of MgF₂ microresonator structure

Fig. 3. Schematic of optical frequency comb based on microresonator structure

Fig. 4. (a) Transmission spectrum of MgF₂microresonator; (b) Lorentz fitted spectral line

Fig. 5. (a)-(f) Evolution process of optical frequency comb under constant detuning with varying pump power

Fig. 6. (a)-(d) Evolution process of an optical frequency comb with detuning changes under constant power

Fig. 7. (a)-(c) Influence of dispersion variation on the evolution of optical frequency comb; (d)-(f) Time-domain spectra of different soliton states