Fig. 1. Schematic diagram of the experimental device with TLS as the pump source. Inset: coupling diagram of tapered fiber and microspheres with diameter of 100μm

Fig. 2. Experimental setup and resonance spectrum using ASE as the pump source

Fig. 3. Q-value test plot of silica microspheres

Fig. 4. Fitting curve of resonant wavelength with input power at 300K ambient temperature

Fig. 5. Fitting curve of resonant wavelength with ambient temperature at 80 μW input power

Fig. 6. The change of resonance spectrum of silica microsphere cavity with excitation power and ambient temperature

Fig. 7. The change of resonance spectrum of Erbium-doped silica microsphere cavity with excitation power and ambient temperature

Fig. 8. The change of resonance spectrum of undoped tellurite glass microsphere cavity with excitation power and ambient temperature

Fig. 9. The change of resonance spectrum of Er³⁺/Tm³⁺ codoped tellurite glass microsphere cavity with excitation power and ambient temperature