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Since its first observation almost three decades ago high-order harmonic generation (HHG) in gases became a reliable source of extreme ultraviolet (XUV) pulses, which gave the possibility to study electronic processes on their natural timescale [1, 2]. While the main building blocks of the experimental setups for gas HHG are the same in almost all cases, the focusing or medium geometry varies from...
We demonstrate a tool for quantitative measurements in the linear and non-linear extreme ultraviolet (XUV) spectral region measuring spatially resolved atomic ionization products at the focus of an XUV beam [1, 2]. The ionizing radiation is a comb of the 11th-15th harmonics of a Ti:Sapphire femtosecond laser beam produced in a Xenon gas jet. The spatial ion distribution at the focus of the harmonics...
Nonlinear photoionization with energetic FEL pulses has opened up new horizons for the investigation of inner-shell electron dynamics in atomic and molecular systems [1]. So far, however, the limited temporal resolution (typically a few tens of femtoseconds) achievable with FELs has hampered the time resolution of these dynamics.
Strong-field ultrafast photoemission was studied by propagating surface plasmons generated on gold metal layer in Kretschmann configuration at 3.1 microns wavelength. Tunneling photoemission and electron acceleration was demonstrated at an unprecedently low laser intensity (1–5 GW/cm2).
We report on a novel 18-TW peak power light source delivering pulses with 80-mJ energy and 4.5-fs duration. The system is based on optical parametric synthesizer principle involving multi-color optical parametric chirped pulse amplification stages.
Laser-wakefield-accelerated electrons were used to drive an all-optical undulator source, a 5-keV betatron X-ray source and a tunable quasi-monochromatic Compton-X-ray source. Also, we present a phase-contrast tomogram of a fly obtained with the betatron beam.
We report on the development and relevant characteristics of an optical parametric synthesizer light source delivering sub-5-fs pulses with 80 mJ energy. The first applications of the system are attosecond and relativistic laser-plasma physics.
The endeavour of generating shorter and shorter light pulses lead to the optical parametric chirped pulse amplification (OPCPA) technique, which provides considerable broader gain bandwidth corresponding to a pulse duration of one to three optical cycles. Systems with such a short duration and multi-terawatt to petawatt power levels provide a unique tool for attosecond [1] and laser-plasma physics...
Harmonics reflected from an oscillating plasma mirror doesn't subject to the limitation of maximum applied laser intensity and can thus exploit the benefit of state-of-the-art terawatt and petawatt laser technology, enabling a route to extreme bright attosecond light sources [1]. When the pulse duration decreases to two laser cycles, intensity gating can lead to an isolated attosecond pulse [2]. This...
The idea of electron acceleration by laser wakefield in plasma has been suggested [1] and proved [2] to give an accelerating gradient up to several orders of magnitude higher than conventional RF based linac. The unique property of laser plasma not only offers the opportunity to build a compact X-ray source [3] but also can be used as an electron diffraction source with high temporal resolution and...
We report the first generation of three-cycle, 8 fs, 125 mJ optical pulses in a noncollinear optical parametric chirped-pulse amplifier (NOPCPA) operating at 805 nm central wavelength. These 16 TW laser pulses are compressed to within 5% of their Fourier limit. These parameters come in combination with an amplified pulse contrast-ratio of 10-5 at Deltat=plusmn5ps and >10-7 at t<-5ps limited...
Simulations and first experiments that aims to improve the temporal resolution of ultrafast electron diffraction are presented. For this purpose a laser with a high pulse energy operating at a MHz-repetition rate has been developed. Work in progress involves scaling the laser energy to the few muJ level by applying a pump laser with higher power and by adding an amplification stage. Few-fs electron...
Summary form only given. Optical parametric chirped pulse amplification is a unique tool for amplification of ultra-broadband pulses to highest energies. In this this paper, we implement a stronger seed source which delivers muJ -level seed pulses with excellent temporal contrast. A 1 kHz, 1 mJ Ti:sapphire amplifier is used as front-end. The output pulses of the Ti:sapphire amplifier are broadened...
Optical parametric chirped pulse amplification is one of the most promising techniques for the amplification of few-cycle pulses. We show amplification and compression to the multiterawatt level of near transform-limited three-optical-cycle pulses.
Optical parametric chirped pulse amplification is one of the most promising techniques for the amplification of few-cycle pulses. We show amplification and compression to the multiterawatt level of near transform-limited three-optical-cycle pulses.
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