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Open AccessStable, intense supercontinuum light generation at 1 kHz by electric field assisted femtosecond laser filamentation in air
Supercontinuum (SC) light source has advanced ultrafast laser spectroscopy in condensed matter science, biology, physics, and chemistry. Compared to the frequently used photonic crystal fibers and bulk materia...
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Article
Free-electron lasing at 27 nanometres based on a laser wakefield accelerator
X-ray free-electron lasers can generate intense and coherent radiation at wavelengths down to the sub-ångström region1–5, and have become indispensable tools for applications in structural biology and chemistry, ...
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Article
High-harmonic generation from topological surface states
Three-dimensional topological insulators are a phase of matter that hosts unique spin-polarized gapless surface states that are protected by time-reversal symmetry. They exhibit unconventional charge and spin ...
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Article
Direct map** of attosecond electron dynamics
The subcycle interaction of light and electrons has been one of the key frontiers in free-electron lasers, attosecond science and dynamical investigation of matter. Capturing the underlying subcycle dynamics o...
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Article
Open AccessDriving positron beam acceleration with coherent transition radiation
Positron acceleration in plasma wakefield faces significant challenges, as the positron beam must be pre-generated and precisely coupled into the wakefield and, most critically, suffers from defocusing issues....
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Article
Open AccessLaser guided ionic wind
We report on a method to experimentally generate ionic wind by coupling an external large electric field with an intense femtosecond laser induced air plasma channel. The measured ionic wind velocity could be ...
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Article
Open AccessTerawatt-scale optical half-cycle attosecond pulses
Extreme-ultravoilet (XUV) attosecond pulses with durations of a few tens of attosecond have been successfully applied for exploring ultrafast electron dynamics at the atomic scale. But their weak intensities l...
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Article
Open AccessCorona discharge induced snow formation in a cloud chamber
Artificial rainmaking is in strong demand especially in arid regions. Traditional methods of seeding various Cloud Condensation Nuclei (CCN) into the clouds are costly and not environment friendly. Possible so...
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Article
Femtosecond-laser-driven wire-guided helical undulator for intense terahertz radiation
The capability of synchrotron radiation to produce ultrabright emission has attracted considerable interest over the last half a century. To date, magnetic undulators with a period of several centimetres are c...
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Open AccessUltrahigh brilliance quasi-monochromatic MeV γ-rays based on self-synchronized all-optical Compton scattering
Inverse Compton scattering between ultra-relativistic electrons and an intense laser field has been proposed as a major route to generate compact high-brightness and high-energy γ-rays. Attributed to the inher...
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Open AccessFemtosecond laser filament induced condensation and precipitation in a cloud chamber
A unified picture of femtosecond laser induced precipitation in a cloud chamber is proposed. Among the three principal consequences of filamentation from the point of view of thermodynamics, namely, generation...
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Article
Open AccessDirect observation of laser guided corona discharges
Laser based lightning control holds a promising way to solve the problem of the long standing disaster of lightning strikes. But it is a challenging project due to insufficient understanding of the interaction...
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Article
Differently patterned airflows induced by 1-kHz femtosecond laser filaments in a cloud chamber
Airflow induced by femtosecond laser (800 nm/1 kHz/25 fs) filamentation with different lengths was investigated in a laboratory cloud chamber. Various filament lengths were generated by adjusting laser energy ...
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Article
Open AccessHollow screw-like drill in plasma using an intense Laguerre–Gaussian laser
With the development of ultra-intense laser technology, MeV ions can be obtained from laser–foil interactions in the laboratory. These energetic ion beams can be applied in fast ignition for inertial confineme...
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Laser-induced supersaturation and snow formation in a sub-saturated cloud chamber
Calculation of the saturation ratio inside vortices formed below the filament in a sub-saturation zone in a cloud chamber was given. By mixing the air with a large temperature gradient, supersaturation was sus...
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Article
Circularly polarized sub-1.5 cycle laser pulses at 1.8 μm
The generation of intense carrier-envelope-phase-stabilized sub-1.5 cycle circularly polarized pulses at 1.8 μm is reported. After changing the polarization of the pulses produced by an optical parameter ampli...
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Article
Manipulation of cross-linked micro/nanopatterns on ZnO by adjusting the femtosecond-laser polarizations of four-beam interference
We report the fabrication of cross-linked micro/nanopatterns on ZnO by adjusting the femtosecond-laser polarizations of four-beam interference. The micro/nanopatterns are composed of two types of patterns with...
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Article
Open AccessPositron acceleration in a hollow plasma channel up to TeV regime
Nowadays, human's understanding of the fundamental physics is somehow limited by the energy that our high energy accelerators can afford. Up to 4 TeV protons are realized in the Large Hadron Collider (LHC). Le...
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Open AccessTerahertz imaging with sub-wavelength resolution by femtosecond laser filament in air
Terahertz (THz) imaging provides cutting edge technique in biology, medical sciences and non-destructive evaluation. However, due to the long wavelength of the THz wave, the obtained resolution of THz imaging ...
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Article
Measurement of nonlinear refractive index coefficient of inert gases with hollow-core fiber
A simple method of determining the nonlinear refractive index coefficient n 2 of inert gases is demonstrated. It is based on the accumulation of optical-Kerr-induced spectral broadening effect in ...
