Fig. 1. (Color online) The simulation parameters of the WG-FP hybrid cavity laser.

Fig. 2. (Color online) The mode Q factor variation with different mode wavelength when (a) Im(n_WG) = Im(n_FP)= 0. (b) Im(n_WG) decreases from 0.00003 to –0.00003 while Im(n_FP) = 0.

Fig. 3. The mode center wavelengths variation with the change of the real part of the square microcavity refractive index Δn_WG.

Fig. 4. (Color online) Fabrication process of the WG-FP hybrid cavity laser.

Fig. 5. (Color online) (a) Cross-sectional view SEM image after ICP etching. (b) The microscope image of the fabricated WG-FP hybrid cavity laser.

Fig. 6. (Color online) (a) Curves of light power variation with I_FP at the I_WG are 0, 2, 5, and 10 mA. (b) Lasing spectrum measured for the laser under I_FP = 80 mA, I_WG = 70 mA.

Fig. 7. (Color online) Lasing characteristics with the variations of I_FP and I_WG for the laser. Lasing spectra (a) variation withI_WG atI_FP = 80 mA, (b) variation withI_FP atI_WG = 35 mA. Dominant lasing mode wavelengths and corresponding SMSRs (c) variation with I_WG atI_FP = 80 mA, (d) variation withI_FP at I_WG = 35 mA, respectively.

Fig. 8. (Color online) Superimposed lasing spectra with a wavelength continuous tuning range of 12.52 nm by varyingI_FP and I_WG simultaneously.