Fig. 1. Schematic diagram of OPCPA amplification stage of 100 PW laser device

Fig. 2. Conversion efficiency and output spectrum of signal beam. (a) Conversion efficiency; (b) output spectrum

Fig. 3. Intensity distributions of pump beam and signal beam. (a) Input pump beam; (b) input signal beam; (c) amplified signal beam

Fig. 4. Effect of phase mismatch on conversion efficiency

Fig. 5. Spatial phase distortion PV value and phase mismatch of signal beam with different wavelengths and phase mismatches

Fig. 6. Effect of phase mismatch on the focusing of the amplified signal beam. (a) Focusing spot under the optimal phase matching condition; (b) focusing spot under the 0.02° deviation of the crystal cutting angle

Fig. 7. Phase distributions of pump beam and amplified signal beam. (a) The phase distribution of pump beam is an ideal plane; (b) phase distribution of amplified signal beam under the pump beam with ideal plane phase distribution; (c) phase distribution of pump beam with defocus; (d) phase distribution of amplified signal beam under the pump beam with defocus; (e) phase distortion distribution of amplified signal beam only caused by the phase distortion of pump beam after deducting the influence of intensity

Fig. 8. Relationship between the phase of amplified signal beam and the phase aberration of pump beam. (a)(b) Phase of the pump beam with astigmatism and the phase distortion distribution of signal beam under the corresponding pump beam; (c)(d) phase of the pump beam with coma and the phase distortion distribution of signal beam under the corresponding pump beam; (e)(f) phase of the pump beam with spherical aberration and the phase distortion distribution of signal beam under the corresponding pump beam

Fig. 9. Relationship between spatial phase distortion PV value of amplified signal beam and that of pump beam

Fig. 10. Phase distributions of signal beam with different pump beam intensity distributions. (a) Second order super Gaussian beam;

Fig. 11. Influence of intensity of modulated pump beam on signal beam phase. (a) Intensity of input pump beam; (b) intensity of amplified signal beam; (c) phase of amplified signal beam

Fig. 12. Influence of small size distortion of pump beam intensity on signal beam phase. (a) Input pump beam intensity distribution when the total energy is 10000 J, where the ratio of distortion intensity of the middle distortion protrusion to platform intensity is 2; (b)(c) near-field intensity and phase distribution of the pumped amplified optical signal under the condition of Fig.(a); (d) input pump beam intensity distribution when the total energy is 5000 J, where the ratio of distortion intensity of the middle distortion protrusion to platform intensity is 2; (e)(f) near-field intensity and phase distribution of the pumped amplified optical signal under the condition of Fig.(d)

Fig. 13. Influence of phase mismatch on signal beam intensity and spatial phase. (a) Intensity of input pump beam; (b) intensity of amplified signal beam; (c) phase of amplified signal beam

Fig. 14. Conversion efficiency and phase distortion PV value of amplified signal beam at saturation stage