130 research outputs found
Streaking strong-field double ionization
Double ionization in intense laser fields can comprise electron correlations,
which manifest in the non-independent emission of two electrons from an atom or
molecule. However, experimental methods that directly access the electron
emission times have been scarce. Here, we explore the application of an
all-optical streaking technique to strong-field double ionization both
theoretically and experimentally. We show that both sequential and
non-sequential double ionization processes lead to streaking delays that are
distinct from each other and single ionization. Moreover, coincidence detection
of ions and electrons provides access to the emission time difference, which is
encoded in the two-electron momentum distributions. The experimental data agree
very well with simulations of sequential double ionization. We further test and
discuss the application of this method to non-sequential double ionization,
which is strongly affected by the presence of the streaking field
Intensity Dependence of Multiple Orbital Contributions and Shape Resonance in High-Order Harmonic Generation of Aligned Nâ‚‚ Molecules
We report measurements and theoretical simulations of high-order harmonic generation (HHG) in aligned Nâ‚‚ molecules using a 1200-nm intense laser field when the generating pulse is perpendicular to the aligning one. With increasing laser intensity, the minimum in the HHG spectra first shifts its position and then disappears. Theoretical simulations including the macroscopic propagation effects in the medium reproduce these observations and the disappearance of the minimum is attributed to the additional contribution of HHG from inner orbitals. We also predict that the well-known shape resonance in the photoionization spectra of Nâ‚‚ should exist in the HHG spectra. It is most clearly seen when the generating laser is parallel to the aligning one and disappears gradually as the angle between the two lasers increases. No clear evidence of this shape resonance has been reported so far when using lasers with different wavelengths. Further experimentation is needed to draw conclusions
Flying doughnut terahertz pulses generated from semiconductor currents
The ability to manipulate the space-time structure of light waves diversifies
light-matter interaction and light-driven applications. Conventionally,
metasurfaces are employed to locally control the amplitude and phase of light
fields by the material response and structure of small meta-atoms. However, the
fixed spatial structures of metasurfaces offer limited opportunities. Here,
using quantum control we introduce a new approach that enables the amplitude,
sign, and even configuration of the generated light fields to be manipulated in
an all-optical manner. Following this approach, we demonstrate the generation
of flying doughnut terahertz (THz) pulses. We show that the single-cycle THz
pulse radiated from the dynamic semiconductor ring current has an electric
field structure that is azimuthally polarized and that the space- and
time-resolved magnetic field has a strong, isolated longitudinal component. As
a first application, we detect absorption features from ambient water vapor on
the spatiotemporal structure of the measured electric fields and the calculated
magnetic fields. Quantum control is a powerful and flexible route to generating
any structured light pulse in the THz range, while pulse compression of
cylindrical vector beams is available for very high-power magnetic-pulse
generation from the mid-infrared to near UV spectral region. Pulses such as
these will serve as unique probes for spectroscopy, imaging,
telecommunications, and magnetic materials
Order-dependent structure of High Harmonic Wavefronts
The physics of high harmonics has led to the generation of attosecond pulses
and to trains of attosecond pulses. Measurements that confirm the pulse
duration are all performed in the far field. All pulse duration measurements
tacitly assume that both the beam's wavefront and intensity profile are
independent of frequency. However, if one or both are frequency dependent, then
the retrieved pulse duration depends on the location where the measurement is
made. We measure that each harmonic is very close to a Gaussian, but we also
find that both the intensity profile and the beam wavefront depend
significantly on the harmonic order.
Thus, our findings mean that the pulse duration will depend on where the
pulse is observed. Measurement of spectrally resolved wavefronts along with
temporal characterization at one single point in the beam would enable complete
space-time reconstruction of attosecond pulses. Future attosecond science
experiments need not be restricted to spatially averaged observables
Intensity dependence of multiple orbital contributions and shape resonance in high-order harmonic generation of aligned N molecules}
We report measurements and theoretical simulations of high-order harmonic
generation (HHG) in aligned N molecules using a 1200-nm intense laser field
when the generating pulse is perpendicular to the aligning one. With increasing
laser intensity, the minimum in the HHG spectra first shifts its position and
then disappears. Theoretical simulations including the macroscopic propagation
effects in the medium reproduce these observations and the disappearance of the
minimum is attributed to the additional contribution of HHG from inner
orbitals. We also predict that the well-known shape resonance in the
photoionization spectra of N should exist in the HHG spectra. It is most
clearly seen when the generating laser is parallel to the aligning one, and
disappears gradually as the angle between the two lasers increases. No clear
evidence of this shape resonance has been reported so far when using lasers
with different wavelengths. Further experimentation is needed to draw
conclusions.Comment: 8 pages, 4 figure
Nonperturbative harmonic generation in graphene from intense midinfrared pulsed light
In solids, high harmonic radiation arises from the subcycle dynamics of electrons and holes under the action of an intense laser field. The strong-field regime opens new opportunities to understand and control carrier dynamics on ultrafast time scales, including the coherent dynamics of quasiparticles such as massless Dirac fermions. Here, we irradiate monolayer and few-layer graphene with intense infrared light to produce nonperturbative harmonics of the fundamental up to the seventh order. We find that the polarization dependence shows surprising agreement with gas-phase harmonics. Using a two-band model, we explore the nonlinear current due to electrons near the Dirac points, and we discuss the interplay between intraband and interband contributions to the harmonic spectrum. This interplay opens new opportunities to access ultrafast and strong-field physics of graphene.Peer reviewed: YesNRC publication: Ye
High-harmonic generation from a confined atom
The order of high harmonics emitted by an atom in an intense laser field is
limited by the so-called cutoff frequency. Solving the time-dependent
Schr\"odinger equation, we show that this frequency can be increased
considerably by a parabolic confining potential, if the confinement parameters
are suitably chosen.
Furthermore, due to confinement, the radiation intensity remains high
throughout the extended emission range. All features observed can be explained
with classical arguments.Comment: 4 pages(tex files), 4 figures(eps files); added references and
comment
- …