Fig. 1. Schematic overview of the double CPA laser system.

Fig. 2. Layout of the OPA–SHG pulse cleaning device. BS1–BS3: beam splitter; ATT: attenuator; L1–L6: lens; SAPH: sapphire plate; $\text{M}_{\text{Ag}}1$, $\text{M}_{\text{Ag}}2$: silver mirror; DM1–DM6: dichroic mirror; M1–M15: 800 nm HR mirror; m1, m2: 2106 nm HR mirror.

Fig. 3. (a) Measured spectrum and (b) autocorrelation trace of the OPA–SHG cleaning pulses.

Fig. 4. Third-order correlation contrast measurements of the 800 nm pump pulses and the 1053 nm OPA–SHG cleaning pulses.

Fig. 5. (a) Pulse durations; (b) spectra of the amplified pulse.

Fig. 6. Time profiles of the pump pulse in the OPCPA pre-amplifier.

Fig. 7. Beam profiles in the OPCPA pre-amplifier: (a) seed beam profile; (b) pump beam profile; (c) OPCPA amplified beam profile; (d) picked-out homogenized beam profile.

Fig. 8. Layout of the two Nd:glass rod amplifiers. TFP1, TFP2: thin film polarizer; QWP1, QWP2: quarter wave plate; LM1, LM2: single-flashlamp-pumped Nd:glass rod module; FR1, FR2: Faraday Rotator; FI: Faraday Isolator; LM3, LM4: double-flashlamp-pumped Nd:glass rod module.

Fig. 9. Near-field beam profile of the amplified pulse.

Fig. 10. Autocorrelation measurement and Fourier-transform-limited pulse duration.

Fig. 11. Third-order correlation contrast measurement of the compressed pulse.