Few-cycle, high-energy, infrared (IR) lasers have been recognized as promising drivers to generate coherent radiation and attosecond pulses beyond the softX-ray, reaching the water window. Based on a high harmonic generation (HHG) process driven by IR pulses, preliminary researches have demonstrated the drastic extension of a cutoff energy to a soft X-ray regime compared to Ti:sapphire-based lasers at 800 nm [1-3]. Although few IR drivers aiming at soft X-ray attosecond pulse generation have been constructed [4-7], these prototypes still require further improvement for potential applications in strong field physics and ultrafast spectroscopy.
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