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Attosecond Fourier transform spectroscopy with attosecond pulse trains is implemented for observing ultrafast quantum wavepacket dynamics in diatomic molecules. Coupled nuclear-electron motions in the molecules are investigated with an attosecond-pump and attosecond probe method.
We have investigated the vibrational wave-packet dynamics of hydrogen molecular ions by the pump-probe measurement using sub-10-fs harmonic pulses. The wave-packet evolution is observed in the time-dependent fragment kinetic energy distribution.
We have resolved the vibrational wave-packet dynamics of D2+ with a period of ∼20-fs generated with sub-10 fs XUV harmonic field. The real-time evolution is probed with the sub-10 fs VUV and DUV harmonic fields.
We measured full-scanning nonlinear Fourier-transform spectroscopy of D2 molecules using high-order harmonic radiation. We compared the spectral shape obtained from the nonlinear Fourier-transform spectroscopy to that measured directly with a spectrometer.
We report on the development of a multi-TW laser system with a pulse duration of 12 fs and an a repetition rate of 100 Hz. This laser system is applied to generate intense high-order harmonic fields with loosely focused geometry.
We have concentrated on studying nonlinear interaction of a simple atom or molecule with VUV/XUV high-order harmonic (HOH) fields without help of intense visible laser field[1]. This is owing to the fact that the pulse energy of an attosecond pulse train (APT) synthesized with the HOH fields is sufficiently high due to our original scheme of HOH generation with loosely focused geometry. Nevertheless,...
Intense high-order harmonic radiation induces nonlinear optical phenomena, such as two or three photon absorption process in the vacuum and extreme ultraviolet wavelength region. Fragment ion yields via two-photon absorption process of N2 and CO2 molecules were utilized as correlated signals of the attosecond pulse train in the measurement of the interferometric autocorrelation (IAC) [1,2], while...
We have observed periodical frequency modulation of high-order harmonics by changing the delay between the driving two-color laser fields, for the first time. The amplitude of the modulation has been up to ∼0.4 eV.
We have developed a laser system generating high peak-power ultrashort pulses based on the chirped pulse amplification of a Ti:sapphire laser. The pulse duration of the laser is reduced to 12 fs, owing to the successful compensation of gain narrowing during amplification with novel optics. The pulse energy and the repetition rate are 40 mJ and 100 Hz, respectively, as a consequence of sufficient energy...
We have demonstrated efficient generation of water-window X-ray harmonics by using an IR parametric source with neutral rare-gas media. Generation of isolated attosecond pulses by the IR source will be also discussed.
The kinetic energy release of the D+ fragment ion from D2 molecule is measured using an interferometric autocorrelation technique. The interference fringes of the omega, 3omega, and 5omega fields emerge on the D+ fragment signals.
We measure the harmonic phase from SF6 with heterodyne interferometry using mixed gases and reproduce it by group theory, which leads to the selection rule for the new spectroscopy recently proposed by Wagner et al..
We have demonstrated the direct amplification of 12-fs pulses in a terawatt-class CPA system of Ti:Sapphire laser. Spectral narrowing during amplification is successfully compensated by regenerative pulse shaping featuring a specially designed partial mirror.
We have demonstrated the direct amplification of 12-fs pulses in a terawatt-class CPA system of Ti:Sapphire laser. Spectral narrowing during amplification is successfully compensated by regenerative pulse shaping featuring a specially designed partial mirror.
We demonstrate interferometric spectroscopy of high-order harmonic fields with a resolution of the XUV optical period. In addition, we obtain an interferometric fringe of an attosecond pulse train by reconstruction from these harmonic fields.
A total output energy exceeding 8 mJ with 50 fs pulse duration has been achieved in the infrared region by power scaling of a parametric amplifier chain, making this source suited as a driver for soft x-ray harmonic pulses.
We have demonstrated the direct amplification of 12-fs pulses in a terawatt-class CPA system of Ti:sapphire laser. Spectral narrowing during amplification is successfully compensated by regenerative pulse shaping featuring a specially designed partial mirror.
Direct observation of an attosecond pulse train, formed with synthesized high- order harmonic fields of an intense femtosecond pulse, is demonstrated. The two photon above-threshold ionization of an argon atom and the two-photon Coulomb explosion of a nitrogen molecule are utilized as a correlated signal of our autocorrelation measurements.
We report on the first experimental evidence of the destructive and constructive interference of high harmonics generated in a mixed gas of He and Ne, which offers a novel method for coherent control of high harmonic generation, measuring harmonic phases, and observing the underlying attosecond electron dynamics.
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