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In this work, we investigate the damage produced in materials when exposed to a laser-generated plasma. The plasma was generated by interaction of a high-intensity laser with Oxygen. We demonstrate that the stress induced on the target surface of a Tantalum target (typical materials used as Plasma Facing Material) after 10h of plasma exposure is equivalent to the stress induced during 1h of conventional...
We demonstrate in VO2, a nearly instantaneous band gap collapse which initiates a phase transition using few-cycle, few-femtosecond laser pulses to measure the change in the optical transmission of the sample in a pump-probe configuration.
We present compression of 22-mJ, 90-fs mid-infrared pulses centered at 3.9 μm down to a duration 33 fs via spectral broadening in a noble-gas-filled capillary and subsequent dispersion compensation in bulk. Large 1-mm core diameter of 3-meter long capillary assures over 60% throughput and allows avoiding of unwanted ionization.
A non-collinear Frequency domain Optical Parametric Amplifier is used to produce a 1.8 μm, 30 mJ, 13 fs laser source, leading to 2.5 TW peak power. This laser opens the way for high brightness soft X-ray attosecond pulses.
Using a non-collinear FOPA, a source delivering 1.8 μm, 30 mJ, 13 fs laser pulses is demonstrated. This is the first step towards 100 mJ for ∼10 TW. This laser opens the way for high brightness soft X-ray attosecond pulses.
Few-cycle high peak power mid-IR sources are required for strong field applications, such as driving HHG in the keV range [1] and high efficiency THz generation [2]. In order to expose target to a peak field without causing excessive ionization, ultrashort pulses consisting of a few-cycles are needed. Parametric sources based on KTA crystals have been successfully used for the generation of multi-mJ...
For the past two decades, tremendous efforts have been put towards the development of intense, ultrashort sources in the infrared (IR) spectral range. This region of the electromagnetic spectra is of great interest for applications such as High Harmonic Generation (HHG) [1] or the generation of THz fields through ω −2ω mixing [2]. These techniques require ultrashort, intense IR sources, as their efficiency...
High brightness XUV sources in the 140–170 eV spectral range are of great demand as this spectral range covers important magnetic and molecular materials, such as the N-edge of Gadolinium and Terbium (145 and 155 eV) and L2,3 edge of sulphur [1]. High-order harmonic generation (HHG) allows performing ultrafast dynamics measurements with high temporal resolution in this spectral range because of extremely...
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 report on 3.2 μm pulse post-compression via spectral broadening in hollow core capillary filled with noble gas. The mid-IR input pulses are generated in a femtosecond OPA based on KTA crystals, which delivers 6 mJ, 80 fs, 3.2 μm CEP-stable idler pulses. Pulses were spectrally broadened in a 3 meter long differentially pumped hollow-core capillary with ∼50% transmission and a statically filled 50...
The superiority of off-pump coronary artery bypass (OPCAB) versus on-pump coronary revascularization remains to be conclusively proven with only a few randomized studies performed with small groups of patients [1, 15, 18, 19]. However, a significant body of evidence, from large risk-adjusted retrospective studies, has suggested that coronary surgery performed without cardiopulmonary bypass (CPB) may...
In a work rehabilitation context, we assessed occupational therapists’ (OTs) shared decision-making (SDM) behaviors with individuals having persistent pain and explored factors influencing SDM behaviors.A cross-sectional study that used audio-recordings of work rehabilitation consultations between OTs trained in SDM and a convenient sample of patients. Eligible patients were: off work for≥12 weeks...
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.
We report laser-guided electric discharges along curved trajectories, and hence around obstacles in line of sight between electrodes. Furthermore, beam self-healing enables direct discharge on target even when the laser beam directly hits the obstacle.
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%.
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