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The nonlinear process of cross polarized wave (XPW) generation, which has been broadly used for temporal contrast enhancement and spectral broadening [1, 2], continue to attract interest in different application schemes. A feature of space-time focusing (STF), which occurs at the focus of spatially dispersed beam, is to deliver highly localized intensity at the focus without incurring high non-linear...
We demonstrate theoretically and experimentally the relevance of the transversal coherence length in high-order harmonic generation (HHG). We present results in which transversal phase matching plays the leading role in the macroscopic HHG.
We present calculations and results for frequency doubling on DiPOLE, a 7J 10 Hz Yb:YAG DPSSL, using DKDP, YCOB and LBO. The LBO crystal achieved the highest conversion efficiency of 65%.
kJ-class DPSSL systems with multi-Hz repetition rate for IFE and other laser-plasma based applications require an amplifier architecture with high efficiency and high gain. We present a concept based on cryogenically cooled ceramic Yb:YAG.
Different optical designs for compensation of radial pulse front delay in optical systems of broadband chirped pulse amplifiers have been analyzed. The results for compensating doublet lens and hybrid element will be presented.
HiPER and ELI are two pan-European projects to establish large-scale laser research facilities. HiPER is dedicated to laser fusion energy research, ELI focuses the exploitation of ultra-short and ultra-intense laser pulses. Both systems will require DPSSL systems delivering ns pulses of kJ-scale energy at multi-Hz repetition rates.
During tokamak operation, Plasma Facing Components (PFC) are exposed to high heat load from plasma radiation and particle overflow. Thus, materials forming the PFC armor are eroded in high flux areas and deposited in low flux areas, in form of layers, more or less thick and sticky. These layers can pollute the plasma discharge, and above all trap a part of the plasma hydrogen isotopes (deuterium or...
In this paper we describe the development of a novel front-end capable of generating pulses with >100nm bandwidth at 910nm, a pulse duration <30fs and energies at the joule level. This system has been developed as a seed source for the development of a 10PW facility for the Vulcan laser. The development is based on large scale OPCPA with the goal of producing pulses with focused intensities...
During Tokamak operation, plasma interacts with the Plasma Facing Components (PFCs). Therefore, exposed matter is eroded and re-deposited on the surface by forming instable layers. For safety and operational reasons and due to the fact that these layers are able to trap part of the hydrogenated species (particularly tritium) in vessel inventory or pollute diagnostics, flake and produce dusts, these...
In this paper we have reported a jitter-free ultra-fast broadband OPA amplification in the sub-ps time domain at the repetition rate of 1 kHz. A novel broadband laser pulse source of ~180 nm (FWHM) at ~910 nm was demonstrated for Vulcan 10 PW OPCPA laser system development.
We report the findings of a detailed study of the impact of the Vulcan OPCPA pre-amplifier on contrast. Using near-field apertures, the ASE pedestal was reduced to 4x10-8 of the intensity of the main pulse.
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