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By improving the throughput of the 4f system and by increasing the input laser pulse energy, milli-joule level two cycle pulses were produced with a liquid crystal spatial light modulator for the first time.
Through FROG-CRAB based on attosecond streaking, we characterized 140 attosecond single isolated pulses generated with a double optical gating using 9 fs lasers.
The effects of streaking speed, time delay jitter, laser intensity variation and shot noise on the reconstruction of attosecond XUV pulse with PCGPA are studied.
Two-electron excitation and autoionization in helium atoms were studied experimentally using isolated attosecond pulses for the first time. The population of the resonance state was modified by intense near infrared laser pulses.
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