Fig. 1. Schematic diagram of the energy level of erbium ion in Er: YAG and its fine energy level

Fig. 2. Single wavelength output theoretically calculated laser waveform under the pumping conditions

Fig. 3. Dual wavelength output theoretically calculated laser waveform under the pumping conditions

Fig. 4. Schematic diagram of experimental device

Fig. 5. Waveform and laser spectrum of 2 699 nm single wavelength laser

Fig. 6. Waveform image and output laser spectrum of 2 803 nm single-wavelength laser

Fig. 7. Waveform image andoutput laser spectrum of 2 803 nm single-wavelength laser

Fig. 8. Waveform image andoutput laser spectrum of 2 803 nm single-wavelength laser