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Journals and Conferences
The so far highest THz pulse energy (125 μJ) and efficiency (0.25%) were measured by optical rectification of 1.3 ps pulses in LiNbO<sub>3</sub>. The generation of mJ-level THz pulses is predicted by calculations.
THz pulses with more than 0.4 mJ energy were generated with 0.77% efficiency by optical rectification of 785-fs laser pulses in LiNbO<sub>3</sub> using tilted-pulse-front pumping. The spectral peak is at about 0.2 THz, suitable for charged-particle manipulation.
Here, a compact solution is proposed for post-acceleration and monochromatization of particles leaving the laser-driven accelerator. The proposed method relies on the evanescent field of intense THz pulses undergoing total internal reflection at symmetrically arranged dielectric-vacuum interfaces. THz pulses in the 0.1-1 THz frequency range are promising… (More)
This paper demonstrates ultrabroadband optical parametric chirped-pulse amplification (OPCPA) with 100-fs pulses in the 100-muJ range. By using OPA for amplifying mainly the weak part of the filament-broadened spectrum much shorter pulses with an improved uniformity of the spectral intensity can be achieved as compared to the direct compression of the… (More)
We report on the design and performance of a Yb:CaF<sub>2</sub> booster with a pass-by-pass compensated spatial gain narrowing. A 5-concave-mirror design affords a flexible number of passes as well as 4f image relay and progressive beam magnification onto the laser crystal.
THz generation scalable to high energies in ZnTe and GaP by tilted pulse front pumping at 1.45 and 1.7 μm wavelength was demonstrated. Up to 0.7% efficiency and 14 μJ energy were achieved.
The carrier-envelope-phase and energy stability of formerly proposed accelerator-based attosecond source is investigated numerically. Carrier-envelope-phase stable pulses with tens of nJ energy and 80 as duration are predicted with 31 mrad phase stability.
High harmonic generation by a strong laser pulse in the presence of a THz pulse is simulated. Consequent spectral extension for different laser wavelengths, and the temporal chirp of the synthesized attosecond pulses are studied.
Extreme Light Infrastructure (ELI), the first laser-based research facility, will be built with a joint international effort to form an integrated infrastructure comprised of at last three branches. The ELI Beamline Facility (Prague, Czech Republic) will mainly focus on particle acceleration and X-ray generation, while the ELI Nuclear Physics Facility… (More)
Different materials suitable for optical rectification are compared in terms of maximal THz generation efficiency and the spectral content. Semiconductors can be advantageous for generating higher-frequency THz pulses; however, the relative spectral width is typically smaller than that in LiNbO<sub>3</sub>. Furthermore, it is shown that imaging errors in… (More)