Fig. 1. The sketch of FOA in SG-II Upgrade facility.

Fig. 2. Final optimized ghost image distribution result of FOA.

Fig. 3. Focal spot distribution of FOA.

Fig. 4. Diameter for 95% of the focal spot energy versus the optical axis deviation.

Fig. 5. Concrete structure design of FOA.

Fig. 6. Experimental setup of FOA in the target system.

Fig. 7. Experimental parameters of energy, power and fluence.

Fig. 8. Measurement of and energy and frequency conversion efficiency.

Fig. 9. Experimental setup for perforation efficiency testing.

Fig. 10. (a) The top view and (b) the side view of the wedged focus lens.

Fig. 11. The angle deviation of the wedged focus lens.

Fig. 12. Positioning for wedged focus lens measurement.

Fig. 13. Light path of interference measurement of the wedged focus lens.

Fig. 14. Offline installation and adjustment of the wedged focus lens in the FOA.

Fig. 15. Optical path of online adjustment of FOA.

Fig. 16. Transmitted wavefront of the FOA (a) before adjustment and (b) after adjustment.

Fig. 17. Focal spot morphology (a) before adjustment and (b) after adjustment.

Fig. 18. Stray light management by ground glass protection in the FOA.

Fig. 19. Sketch of the sinusoidal surface of the ground glass.

Fig. 20. Morphology of the ground glass in the electron microscope (a) before HF etching and (b) after HF etching.