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In ultra-intense ultrafast laser-matter interaction, the interplay of laser-induced oscillating space-charge fields with laser E- and B-fields can strongly affect whether the interaction is relativistic or not; with increasing intensities, relativistic character may saturate.
We present a contrast filter reaching 12 orders of magnitude from micro to milliJoule input pulse with 24% efficiency. It solves contrast issue for Petawatt class lasers in microjoule seeded CPA or double CPA scheme.
We describe measurements characterizing the interaction of ultra-high intensity Petawatt laser pulses with solid targets. Experiments were performed on the Petawatt laser at RAL, and the Titan laser at LLNL.
We present a new scheme of Ti:Sa laser amplification, based on second harmonic generation from a Ti:Sa laser tuned at 496 nm by an OPA system and amplification in an excimer double cavity.
Laser ablation is a well-established solid-state film growth technique that typically involves applying a nanosecond laser beam to ablate a target material, followed by depositing the precursor vapor onto a substrate. A main technical obstacle for growing thin films with conventional nanosecond laser ablation is the formation of micron-sized particulates or droplets, which would be unacceptable for...
Waveguides were fabricated in fused silica using kHz and MHz repetition rate femtosecond lasers. Raman and fluorescence microscopy showed increases in 3-membered rings for both cases and fewer NBOHC-defects when writing with the MHz laser.
The results of experimental measurement of small surface oscillations using a femto-second laser are presented. Itpsilas shown that the use of ldquochirpedrdquo pulses allows to reduce the contribution of correlated noise to the signal-to-noise ratio.
Similariton laser oscillators support much higher pulse energies. Despite experimental and numerical studies, there is no analytic theory to date. We present a semi-analytic theory based on the variational approach and a novel trial function.
Ultrafast-laser pulsetrain-burst processing (microsecond bursts at 100 MHz) is an option for fluence-delivery which leads to exceptional characteristics of morphology and processing-rates; we describe the background science and application to mitigation of high-power laser-induced damage.
Periodic nanoripples of tungsten on sapphire were grown using linearly-polarized femtosecond laser. The ripple orientation was found parallel to laser polarization. By scanning the substrate, we demonstrated tungsten grating with periodicity around 150 nm.
We introduce the notion of temporal superresolution for ultrashort pulses, by analogy with the well-known method of optical superresolution. Without spectral width modification we shape a pulse into a central peak of duration well below the Fourier limited.
Tightly focused ultrashort-pulse light efficiently drives a hard x-ray source (eta=0.08%) with 9-mum size enabling imaging of small features using indigenous electrons in Mo and Au/Si. In-plane and out-of-plane angular distribution of x-rays is measured.
We designed a new laser composed of two-dimensional coupled photonic crystal microcavity arrays that can operate at speeds above 100 GHz with large power conversion efficiency. We will present time-domain measurements, which support our theoretical predictions.
The ionization rate of Ar with circularly polarized ultrashort laser pulses shows a spatial dependence attributable to the carrier-envelope phase of the pulse. A numerical simulation shows similar characteristics.
Polarization and phase shaped pulses can now be used for the absolute identification and quantification of mixtures containing isomers and enantiomers. The performance of this methodology will be discussed.
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