We work on the development of intense ultrashort-pulse light sources and their applications to ultrafast spectroscopy of strong-field-driven processes on the femtosecond to attosecond scales. Regarding the R&D of light sources, we focus on the generation of waveform-controlled intense optical pulses from visible to mid infrared spectral ranges, and the generation of soft-X-ray attosecond pulses using the physics of high harmonic generation. Furthermore, we develop the building blocks of next-generation light sources to break the limit of current Ti:sapphire laser-based technologies. Based on these novel light sources and techniques, we develop attosecond soft-X-ray spectroscopy and other ultrafast methodology to explore field-driven nonlinear processes of atoms, molecules, and solids. Our waveform-controlled intense light sources and related technologies are expected to realize novel ultrafast spectroscopy that cover an extremely broad spectral range from THz to soft X rays. We aim to observe and control ultrafast dynamics of non-equilibrium states of matters through various freedoms.

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