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We demonstrate single-shot measurement of fringe visibility of 13-nm high-order harmonic beam in a Youngpsilas double slit experiment. The visibility of 0.96 was obtained with optimal phase-matching condition for the 13-nm harmonics.
A dramatic enhancement of harmonics and the extension of cutoff were observed in a linearly polarized two-color laser field below 10 nm. The intense soft X-ray supercontinuum provides an alternative for the attosecond generation.
XUV harmonics are used to study the photoelectron spectrum of O2. The autoionization states of O2 are further investigated using XUV harmonic as pump and IR laser as probe.
Polarization gated high harmonic generation was phase matched to produce 104 XUV photons per shot. This allowed us to observe the dependence of the XUV supercontinuum on the carrier envelope phase of the laser pulses.
When the laser field consisting of sub-10-fs fundamental and its second harmonic was used for high harmonic generation, a continuum centered at 30 nm with a spectral bandwidth of 8 nm was obtained with an energy of 10 nJ.
We model slow-light propagation in an active semiconductor waveguide in the large modulation depth regime. Distortion from higher harmonics is countered by filtering and the regenerating properties of the device further increase the modulation depth.
Addition of 1% second harmonic intensity to the driving field in high-harmonic generation can be used to double the attosecond-pulse period to one optical cycle, explained by a classical mechanism and observed in a quantum simulation.
We report the observation of two-photon ionization processes of rare-gas atoms produced by an intense high-order-harmonic source via photoelectron spectroscopy. Using the two-photon signals in photoelectron spectra and their ionization cross sections are estimated.
Isolated XUV pulses with a temporal duration of 950 as were characterized by the autocorrelation technique based on two-photon above threshold ionization.
We demonstrate a significant extension of the high harmonic cutoff by generation in a pre-ionized plasma created with a capillary discharge. In xenon, the cutoff extends from ~ 95 to 140 eV.
We demonstrate a nanosecond all-fiber pump laser based supercontinuum source with a peak power density of 2 W/nm in the 0.5 to 1.8 mum range. The source is applied to characterization of periodically poled crystals.
We present temporal characterization of attosecond pulse trains generated during self-guided propagation of intense pulses in a long gas target. Spectral phase jumps are observed, affecting the temporal shape of the attosecond pulse train.
We have observed ablation patterns on metal surfaces made by focusing high-order harmonics in the soft-X-ray region. The ablation processes are investigated from the intensity dependence.
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