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High-energy multi-channel waveform synthesizer for generating microjoule-level isolated attosecond pulses

We demonstrate a novel light source based on coherent three-channel waveform multiplexing employing 28-fs carrier-envelope-phase stable pulses. This waveform synthesizer consists of the three-channel as 0.8 μm, 1.35 μm, and 1.95 μm. The three-channel pulse energy reaches 50 mJ, which is the highest energy ever reported for a parallel synthesizer.