Fig. 1. Experimental setup of LD end-pumped square YAG/Yb∶YAG composite crystal z-shaped fold cavity laser

Fig. 2. Geometry diagram of LD end-pumped square YAG/Yb∶YAG composite crystal

Fig. 3. Temperature distribution of square composite crystal in pump surface

Fig. 4. Temperature variation along z axis in the square composite crystal under different pump powers

Fig. 5. Temperature variation along z axis of gain crystals of composite crystals bonded with YAG of different lengths

Fig. 6. Temperature variation along z axis of gain crystals of square YAG/Yb∶YAG composite crystals of different cross section sizes

Fig. 7. Thermal deformation distribution of square YAG/Yb∶YAG composite crystal in pump surface

Fig. 8. Thermal deformation curves of square YAG/Yb∶YAG composite crystals with different bonding thicknesses along the z axis

Fig. 9. Thermal stress distribution of square YAG/Yb∶YAG composite crystal in pump surface

Fig. 10. Thermal stress variation along z axis of square YAG/Yb∶YAG composite crystals with different bonding thicknesses