Since the first demonstration of attosecond optical pulses in 2001, attosecond science has made a tremendous progress using waveform-controlled intense femtosecond pulse in near-infrared (NIR) and attosecond pulses in extremely ultraviolet (EUV). These progresses heavily owe to Ti:sapphire lasers and related technologies to generate and control ultrashort optical pulses. However, the matured technology of Ti:sapphire lasers is becoming a barrier of attosecond science because the energy scale of attosecond pulses are determined by laser wavelength and the average power of Ti:sapphire lasers are limited to ~20 W due to thermal load of the laser crystals.

© 2019 Japan Society of Applied Physics, The Optical Society (OSA)

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