Fig. 1. Structure diagrams of Er³⁺,Yb³⁺∶glass waveguide.(a) Bonding Co²⁺∶glass; (b) without bonding Co²⁺∶glass

Fig. 2. Absorption distributions of pump light

Fig. 3. Experimental device of passive Q-switched laser.(a) Structure diagram; (b) physical photo

Fig. 4. Photo of waveguide and heat sinks

Fig. 5. Curves of output energy of different waveguides with pump energy. (a) Free oscillation; (b) passively Q-switched

Fig. 6. Pulse waveforms of different waveguides.(a) Bonding Co²⁺∶glass; (b) without bonding Co²⁺∶glass

Fig. 7. Fitting curves of beam quality in passively Q-switched state