Fig. 1. Schematic of 4×2 combined chip amplifier with 400 mm diameter (length of three pieces)

Fig. 2. Model for pump-induced beam pointing drift

Fig. 3. Simulation calculation results of xenon lamp radiation spectrum

Fig. 4. Pump field distributions at different positions of our device. (a) End-face near mid-lamp-box; (b) end-face near side-lamp-box

Fig. 5. Pump symmetries for different pump configurations

Fig. 6. Calculation results by finite element method. (a) Pump-induced temperature distribution; (b) pump-induced deformation distribution

Fig. 7. Schematic diagram of experimental optical path

Fig. 8. Tilt component distribution of dynamic wavefront of experimental device

Fig. 9. Multi-pass optical path based on inverter

Fig. 10. Dynamic drift angle and drift amount at each hole of spatial filter. (a) Dynamic drift angle; (b) drift amount

Fig. 11. Full four-pass multi-pass optical path in cavity