Fig. 1. The schematic diagram of GaAs based InAs quantum dot laser structure

Fig. 2. Cross section SEM of InAs quantum dot laser on GaAs

Fig. 3. The PL spectra of GaAs-based undoped and Be-doped InAs quantum dot lasers，Inset：a 2×2 µm² AFM image of InAs quantum dots

Fig. 4. The IVP characteristic curves of GaAs-based InAs quantum dot laser in CW mode：（a）undoped，（b）Be-doped

Fig. 5. The IP characteristic curves of GaAs-based InAs quantum dot laser with different ridge widths in CW mode：（a）10 μm，（b）50 μm

Fig. 6. The emission spectra of GaAs-based InAs QD laser with different injection currents at the temperature of 20 ℃：（a）undoped，（b）Be-doped

Fig. 7. The emission spectra of GaAs-based InAs QD laser with different temperatures at the same injection current of 350 mA：（a）undoped，（b）Be-doped

Fig. 8. The characteristic temperature curves of GaAs-based InAs quantum dot laser