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In this work, we study carrier dynamics in gated graphene using tunable-infrared (IR)–pump/terahertz (THz)-probe spectroscopy. Interband transitions are Pauli blocked in highly doped graphene when pumping at long wavelengths.
Driving high-harmonics (HH) from Mn+ with IR lasers at 1.82 μm revealed the contribution of inner-shell 3p-3d and 3p-4s channels through an intensity increase at energies from 49 eV to 51 eV.
In the generation of high harmonics from a ZnO crystal we find that “generalized recollisions” between electrons and their holes dominate the emission, and that they can be used to reconstruct the crystal band structure.
We investigate the behavior of resonant-induced harmonics from tin using driving lasers with tunable wavelengths. The intensity of the resonant harmonic is suppressed by the tuning laser wavelength around 1.8μm to understand the interaction dynamics of continuum electron with the autoionizing states.
Carbon molecules are used to generate intense high-order harmonics using driving lasers with 0.8 μm–1.71 μm wavelengths. By driving plasma of reduced size (∼200μm) with 1.71μm laser, we could extend the cutoff to ∼70eV, while reducing the peak intensity by only ∼31%.
General restrictions arising from gain-narrowing and phase-matching are circumvented by employing parametric amplification in the frequency rather than the time domain. Frequency-domain OPA has been used for amplifying few-cycle pulses and for high gain amplification.
Intense, few-cycle infrared laser pulses centered at 1.8 µm wavelength, coupled to a new gas cell design, are employed to drive high harmonic generation with high flux down to the soft X-ray regime.
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