In attosecond optical sciences, we can measure the dynamics of matter on unprecedented time scales with phase-stabilized intense ultrashort laser pulses and attosecond soft-x-ray pulses. One of the main objectives in attosecond sciences is to measure and control the multielectron dynamics of matter in highly excited states. Intense ultrashort-pulse lasers are also useful to produce optical pulses at different wavelength covering from soft x rays to IR and THz. It means that we can probe and control the ultrafast dynamics of matters through various freedoms. We work on the development of intense ultrashort-pulse lasers, and their applications to attosecond optical sciences. Especially we work on high harmonic generation, aiming to produce attosecond soft x-ray pulses for time-resolved soft-x-ray spectroscopy. We also work on the generation of intense IR and THz pulses and their applications to coherent control of atoms and molecules.
Soft x-ray spectra in the water window produced by an intense IR laser system.
High harmonic spectra in the water window and their dependence to carrier-envelope phase (CEP).
Development of intense ultrashort-pulse lasers
Generation of attosecond soft x-ray pulses, high harmonic generation, and their applications to ultrafast spectroscopy
Coherent control and imaging of molecules using intense laser sources
Carrier-Envelope-Phase-Preserving, Octave-Spanning Optical Parametric Amplification in the Infrared Based on BiB3O6 Pumped by 800 nm Femtosecond Laser Pulses: N. Ishii, K. Kitano, T. Kanai, S. Watanabe and J. Itatani, Appl. Phys. Express4 (2011) 022701.