Fig. 1. Schematic of the experiment. SHG, second harmonic generation; AO, adaptive optics; OAP, off-axis parabolic mirror.

Fig. 2. Normalized waveforms of the incidence signal (blue), amplified signal (red) and incidence pump (green) for OPCPA-II.

Fig. 3. Normalized spectra of the incidence (blue) and amplified (red) signal, compared with the theoretical gain of YCOB-based OPCPA-II (green).

Fig. 4. The reflection (a) and transmission (b) properties of YCOB crystal measured by a ZYGO interferometer.

Fig. 5. (a) Amplified signal energy achieved by numerical simulation (red solid line) and measured in the experiment (red circles); (b) conversion efficiency obtained by numerical simulation (blue solid line) and experimental measurement (blue circles).

Fig. 6. OPCPA conversion efficiency versus the deviation from the optimal phase-matching angle, when the non-collinear angle was set at 2.74°.

Fig. 7. Near fields of the amplified signal in OPCPA-II based on YCOB (a) and LBO (b) crystals.

Fig. 8. The dynamic wavefront aberrations measured by a Hartmann sensor in the adaptive optics assembly for OPCPA–II with YCOB crystal (a) and LBO crystal (b).

Fig. 9. The autocorrelation (AC) trace of a signal pulse after the master compressor.