S
Satoshi Ashihara
Researcher at University of Tokyo
Publications - 126
Citations - 1511
Satoshi Ashihara is an academic researcher from University of Tokyo. The author has contributed to research in topics: Femtosecond & Ultrashort pulse. The author has an hindex of 19, co-authored 115 publications receiving 1351 citations. Previous affiliations of Satoshi Ashihara include Tokyo University of Agriculture and Technology & National Presto Industries.
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Ultrafast structural dynamics of water induced by dissipation of vibrational energy.
TL;DR: A two-stage structural response of this network to energy disposal is demonstrated: vibrational energy from individually excited water molecules is transferred to intermolecular modes, resulting in a sub-100 fs nuclear rearrangement that leaves the local hydrogen bonds weakened but unbroken.
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Soliton compression of femtosecond pulses in quadratic media
TL;DR: In this paper, the authors describe efficient soliton compression of femtosecond pulses by use of cascade quadratic nonlinearity and normal dispersion in a multiscale media, which is achieved in ∼30mm-long beta-barium borate at a wavelength of 800 nm.
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Vibrational couplings and ultrafast relaxation of the O–H bending mode in liquid H2O
TL;DR: In this paper, the femtosecond dynamics of O-H bending excitations were studied in pump-probe experiments at frequencies from 1000 to 3500 cm −1, where the O−H bending relaxation transferred excess energy to intermolecular modes, giving rise to a red-shifted librational absorption.
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Ultrafast vibrational relaxation of O-H bending and librational excitations in liquid H2O
TL;DR: In this article, population relaxation of the O-H bending mode in pure liquid H 2 O is studied via nonlinear vibrational absorption in mid-infrared pump-probe experiments with a 100-fs time resolution.
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Polarization-Resolved Study of High Harmonics from Bulk Semiconductors.
Keisuke Kaneshima,Yasushi Shinohara,Kengo Takeuchi,Nobuhisa Ishii,Kotaro Imasaka,Tomohiro Kaji,Satoshi Ashihara,Kenichi L. Ishikawa,Jiro Itatani +8 more
TL;DR: A two-dimensional single-band model is developed to show that the anisotropic curvature of an energy band of solids, which is pronounced in an outer part of the Brillouin zone, induces the generation of the perpendicular odd harmonics.