Fig. 1. Experimental setup and reflectivity curve

Fig. 2. Influence of VBG temperature on η₀ and δ_λ

Fig. 3. VBG temperature-wavelength tuning curve

Fig. 4. Spectrum simulating and spectrum test results

Fig. 5. Relationship between laser wavelength and performance

Fig. 6. Pulse trace and pulse set-up time

Fig. 7. Relationship between pump power and performance

Fig. 8. η₀ and δ_λ of VBG versus t_V

Fig. 9. Influence of η₀ and δ_λ on laser performance

Fig. 10. Laser performance