Fig. 1. Three-dimensional model of microcavity laser with radial waveguide

Fig. 2. TE mode intensity spectra of microcavity laser obtained by broadband source

Fig. 3. Normalized intensity distributions Hz2 of the symmetric mode at 1519.6 nm in cross sections of (a) z=0 μm and (b) y=0 μm

Fig. 4. Preparation process flow for microcavity laser

Fig. 5. (a) SEM image of microcavity laser after ICP etching; (b) microscopic picture of fabricated microcavity laser

Fig. 6. Output power-current and voltage-current curves measured at 298 K

Fig. 7. (a) Spectral characteristic of microcavity laser at injection current of 9 mA; (b) mode wavelength and SMSR versus injection current at 298 K

Fig. 8. Calculated mode intensity-normalized current curves at different spontaneous emission factors, the inset is the variation of output power with injection current