We report a high-contrast, high-intensity Ti:sapphire chirped-pulse amplification system that incorporates a nonlinear preamplifier based on optical parametric chirped-pulse amplification (OPCPA). By cooling the Ti:sapphire crystal in the final amplifier down to , the chirped-pulses are amplified to at a repetition rate without a thermal lensing effect. Pulse compression down to duration obtained after amplification indicates a peak power of . With the OPCPA, the temporal contrast is significantly improved to better than in a few picoseconds interval prior to the main laser pulse.
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