Fig. 1. Schematic of H⁺ implantation and vacancy distribution in the laser sample. (a) Schematic of H⁺ implantation; (b) vacancy distribution

Fig. 2. Optical micrograph of fabricated bars and SEM image of cross section of tube core. (a) Optical micrograph of fabricated bars; (b) SEM image of cross section of tube core

Fig. 3. η-I-P and R-V-I curves for H⁺ implanted lasers. (a) η-I-P curves; (b) R-V-I curves

Fig. 4. η-I-P and R-V-I curves for the lasers without H^＋ implantation. (a) η-I-P curves; (b) R-V-I curves

Fig. 5. RIN curves of lasers at 150 mA and 200 mA bias current. (a) After H⁺ ion implantation; (b) before H⁺ ion implantation

Fig. 6. Frequency-noise curves of lasers at 150 mA and 200 mA bias current. (a) After H⁺ ion implantation; (b) before H⁺ ion implantation