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A single cycle laser pulse is generated using a two stage compressor consisting of a hollow core fiber and multiple fused silica plates. The single cycle laser pulse is sampled using the sub-cycle tunneling ionization in a gaseous medium or air.
Near transform-limited 63-as high-harmonic pulses were successfully generated by compensating positive attosecond chirp of harmonics using negative group delay dispersion of Ar in broad spectral region. Without proper chirp compensation, the harmonic pulses were split into multiple peaks due to the large phase variation, in addition to the broadening of pulse duration. The chirpcompensated broadband...
An arbitrary optical waveform can be measured by adding a weak additional signal field in high harmonic experiments. The wavelength dependence of the signal field is investigated using the quantum path analysis.
We present a novel spatio-temporal characterization method for the attosecond pulses produced through high harmonic generation. A spatio-temporal profile is reconstructed from the spatial modulation of the harmonic spectra in the far-field.
Attosecond high-harmonic pulses obtained from Ar were characterized by the two methods — RABITT and FROG CRAB. The comparison of the two results revealed the capabilities of the two methods well.
For complete temporal characterization of an attosecond harmonic pulse train the frequency-resolved optical gating technique is applied to the photoelectron spectra of He driven by high harmonic pulses and IR laser pulses with time delay, which shows the detailed temporal information of attosecond pulses in the attosecond pulse train.
The intrinsic chirp of attosecond harmonic pulse obtained from Ar was compensated by taking into account the material dispersion of the harmonic generation medium itself. The measured attosecond pulse duration was very close to the transform-limited value.
Excitation to an autoionization level in O2 is achieved using a high harmonic light source. The 11th harmonic at 72.7 nm from Kr gas excites O2 in the ground state to the autoionizing level, and the dynamic behavior is investigated by laser-field-assisted photoionization with a pump-probe scheme.
Using the FROG CRAB method, complete temporal reconstruction of attosecond harmonic pulses was achieved. The compensation of intrinsic attosecond chirp was also demonstrated in the harmonic generation medium itself, thereby achieving transform-limited attosecond pulses.
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.
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