We are working on the development of intense ultrashort pulse light sources and their applications in ultrafast spectroscopy on the femtosecond to attosecond time scale. In light source R&D, we focus on the generation of waveform-controlled intense optical pulses from the visible to the mid-infrared spectral range and the generation of short-wavelength ultrashort pulses using the physics of high-order harmonic generation in gases, solids and liquids. In addition, we are developing the building blocks of next-generation light sources to overcome the limitations of current Ti:sapphire laser-based technologies. Based on these novel light sources and techniques, we are developing attosecond soft X-ray spectroscopy and other ultrafast methods to probe field-driven nonlinear processes in atoms, molecules, solids, and liquids. Our waveform-controlled intense light sources and related technologies are expected to realize novel ultrafast spectroscopy covering an extremely broad spectral range from THz to soft x-rays. Our goal is to observe and control the ultrafast dynamics of non-equilibrium states of matter through various degrees of freedom.

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