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In this paper, we develop a high-energy three-channel parallel waveform synthesizer using a CEP-stabilized high energy Ti:sapphire laser [1] operating at 10 Hz, and demonstrate high-flux continuum harmonics from Ar gas target. Our three-channel waveform synthesizer consists of a Ti:sapphire laser pulse (44 mJ, 28 fs) and an infrared OPA (signal: 6 mJ, 33 fs, idler: 3 mJ, 40 fs). By combining the waveform...
For the future progress of nonlinear attosecond science, one of the most important issues is the development of high-energy isolated attosecond pulse sources. In this paper, we review our research on the energy-scaling method for isolated attosecond pulse generation, which combines infrared two-color gating and an energy-scaling method of high-order harmonic generation. By establishing the robust...
We propose a method to monochromatize high-order harmonics to isolate a single beam of harmonic radiation comprising femtosecond pulses. This novel method uses a multilayer-mirror approach, and has broadband tunability and high reflectivity in the soft-x-ray region.
To make a breakthrough for attosecond science, one of the most important issues is the development of high-power isolated attosecond pulses (IAPs) and/or attosecond pulse trains (APTs). At present high-power APTs have been successfully generated thanks to research on harmonic energy scaling using a loosely focusing geometry [1]. Although IAP were already obtained using a state-of-the-art Ti:sapphire...
Output energy exceeding 20 μJ has been achieved in the EUV region at 61 nm by the harmonic seeded FEL scheme. Event ratio of the seeded FEL operation has been dramatically improved by a feedback system with an electro-optic sampling technique.
We found a significant difference between the interferometric fringes on the intensity-autocorrelation and those on anisotropy-autocorrelation of an atttosecond pulse train. This result can discriminate multiple two-photon processes ionizing a nitrogen molecule.
We successfully generated a microjoule isolated attosecond pulse (IAP) for investigating attosecond nonlinear phenomena in atoms and molecules. Pulse duration of IAP was directly evaluated to be 500 as by autocorrelation method using the Coulomb explosion of N2.
We investigated multiple ionization process in atoms and molecules by an intense isolated attosecond pulse. Observed Ne2+ signal guarantees that our IAP sources are strong enough to create the nonlinear phenomena.
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 proposed a new gating scheme, called infrared double optical gating for producing isolated attosecond pulses. It was shown that CEP stabilization is not required even though a multicycle driving pulse is used.
By mixing two infrared laser pulses of different wavelengths, we generate the continuum harmonic spectrum around a cut-off region. Our obtained harmonic spectra clearly show the possibility of generating isolated attosecond pulses from many-cycle laser pulse.
We proposed and theoretically demonstrated an optimized two-color polarization gating method to produce isolated attosecond pulse by using a multicycle infrared laser pulses with the pulse duration up to 60 fs.
We first generated seeded FEL radiation in the EUV region at 61.2 nm with the 13th harmonic of a Ti:sapphire laser. We observed single-peak spectra with drastic enhancements of intensity by nearly three-orders of magnitude.
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 theoretically investigate and demonstrate a two-color scheme mixed by an infrared and fundamental (800 nm) laser pulses to enhance the harmonic yield and soften the wavelength dependence.
By mixing two infrared laser pulses of different wavelengths, we generate the continuum harmonic spectrum around a cut-off region. Our obtained harmonic spectra clearly show the possibility of generating isolated attosecond pulses from many-cylse laser pulse.
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.
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