Fig. 1. Coupled cavity laser consisting of an FP cavity and a square cavity

Fig. 2. TE mode distribution of the HSRL mode coupling at different wavelengths. (a) 1298.3 nm; (b) 1297.6 nm; (c) 1297.8 nm

Fig. 3. SEM image and microscope image of HSRL. (a) SEM image of square-FP coupled cavity; (b) microscope image of patterned P electrode HSRL

Fig. 4. Relationship between SMF coupled output power and injected current in FP cavity and square cavity

Fig. 5. Lasing characteristic curves of HSRL at different bias currents. (a) I_FP =52 mA, I_SQ=0 mA; (b) I_FP =64 mA, I_SQ=5 mA

Fig. 6. Lasing spectra of HSRL at different bias currents. (a) I_SQ=1 mA, I_FP=20--75 mA; (b) I_SQ=5 mA, I_FP=15--78 mA; (c) I_SQ=10 mA, I_FP=15--84 mA; (d) I_SQ=15 mA, I_FP=14--41 mA

Fig. 7. Lasing spectra of laser when I_SQ=10 mA. (a) I_FP=16,30,45 mA; (b) I_FP=55,65,80 mA; (c) relationship between main lasing wavelength , SMSR and I_FP

Fig. 8. Lasing characteristic curves of HSRL at different FP cavity bias currents. (a) Relationship between main lasing wavelength, SMSR and I_SQ; (b) change curve of laser lasing wavelength with I_SQ at I_FP=23 mA; (c) lasing spectrum of laser at I_FP=23 mA

Fig. 9. Thermal characteristic curves of the HSRL. (a) Temperature of the active region changes with I_FP; (b) threshold current of the FP cavity changes with the temperature of the active region