Fig. 1. Schematic of principle and experiment of DPA^[67]

Fig. 2. Principle of EDPA system^[47]

Fig. 3. Schematic illustration of the EDPA setup used for the combination of four temporally separated pulses^[47]

Fig. 4. Experimental results of temporal combination system of 128 pulse replicas based on EDPA setup^[59]

Fig. 5. Experimental results of spatiotemporal combination system based on EDPA set up^[65]

Fig. 6. Experimental results of spatiotemporal combination system with a pulse energy of 32 mJ based on EDPA setup^[66]

Fig. 7. Stack and dump enhancement cavity^[49]

Fig. 8. Schematic of a chopper-wheel^[49]

Fig. 9. Set up of SnD enhancement cavity and its experimental results^[60]

Fig. 10. Coherent pulse stacking in a traveling-wave Gires-Tournois interferometer^[48]

Fig. 11. Cascaded GTI cavities^[48]

Fig. 12. Coherent pulse stacking of 27 pulses in a 4+1 GTI resonator sequence^[62]

Fig. 13. Coherent pulse stacking of 81 pulses in a 4+4 GTI resonator sequence^[63]

Fig. 14. Simulation and experimental result of coherent pulse dtacking of 81 pulses in a 4+4 GTI resonator sequence^[63]

Fig. 15. Experimental result of efficient coherent pulse stacking of 81 pulses in a 4+4 GTI resonator sequence^[70]

Fig. 16. Principle of coherent pulse stacking based on deep recurrent neural network^[72]

Fig. 17. Experimental results of the coherent pulse stacking based on deep recurrent neural network^[72]

Fig. 18. Principle of temporal coherent combination in DPA based on RL controller^[73]

Fig. 19. Principle of temporal coherent combination in DPA based on SAC-SPGDM and the procedure of algorithm^[74]

Fig. 20. Comparison of control algorithms in DL-CPS^[74]

Fig. 21. Simulations illustrating the tolerances of the coherent pulse stacking parameters for 4+4 GTIs. Achievable pre-pulse contrast degrades in the presence of cavity phase errors, pulse phase errors, or pulse intensity errors^[70]