Fig. 1. Schematic diagram of InGaN-based LD standard structure and new structures

Fig. 2. Simulation and experimental L-I characteristic curves of standard structure

Fig. 3. Internal parameters of blue laser. (a) Three P-I curves with different front facet coating reflectivities; (b) curve of internal optical loss and carrier injection efficiency obtained by fitting mirror loss and slope efficiency

Fig. 4. Performance of standard structure. (a) Curves of photoelectric conversion efficiency and volt-ampere characteristic; (b) electron current density curve and logarithmic curve of electron concentration at 1 A current

Fig. 5. Standard structure changes with the In mole fraction of UWG layer. (a) Curves of optical power with In mole fraction under different injection currents; (b) curve of electron leakage rate and wave function coincidence rate with In mole fraction at 1 A current

Fig. 6. Curve of optical power with In mole fraction at 1 A current (change the start point of the gradient)

Fig. 7. Performance of the new structure and standard structure. (a) Photoelectric conversion efficiency and optical power curves; (b) comparison of stimulated recombination rate

Fig. 8. Energy band diagrams of three samples at 1 A current. (a) Conduction band; (b) valence band

Fig. 9. Electron current density curves of three samples at 1 A current

Fig. 10. Lasing spectra of three structures at 1 A current (each peak has been normalized)

Fig. 11. Optical field distributions and refractive index curves of three structures at 1 A current