Fig. 1. Absorption spectrum of Er:YAG gain medium

Fig. 2. Schematic diagram of dopant ion energy leap structure of Er/Yb co-doped fiber

Fig. 3. Schematic diagram of 1532 nm Er/Yb fiber laser

Fig. 4. Output power of 1532 nm fiber laser

Fig. 5. Output wavelength at different FBG temperature

Fig. 6. Laser wavelength at FBG temperature of 70 ℃

Fig. 7. FWHM of 1532 nm fiber laser

Fig. 8. M² of 1532 nm fiber laser

Fig. 9. Schematic of the Er:YAG NPRO

Fig. 10. Output power of the Er:YAG NPRO

Fig. 11. Output wavelength of the Er:YAG NPRO

Fig. 12. Spectrum of the Er:YAG NPRO