Abstract
Relativistic surface high harmonics have been considered a unique source for the generation of intense isolated attosecond pulses in the extreme ultra-violet and x-ray spectral ranges. Their practi ...
Highlights
The invention of sources of attosecond pulses based on high-order harmonic generation (HHG) [1,2,3] has opened the field of attosecond science [4,5] with a wide range of potential applications [6]
The mirror guiding the beam to the spectrometer was motorized to enable optimization of the incoupling and could be entirely moved out of the beam path to allow the measurement of the XUV beam profile with a micro-channel plate (MCP) detector and a phosphor screen (Photonis E3075-25-I60-PS20-FM8, 3 inch diameter)
The CEP dependence of the harmonic position shift and of the integrated harmonic yield for these results obviously differ both from the experimental data and the simulations for Lp 0.2λ, which supports our estimation of the experimental plasma scale length of Lp 0.2λ
Summary
The invention of sources of attosecond pulses based on high-order harmonic generation (HHG) [1,2,3] has opened the field of attosecond science [4,5] with a wide range of potential applications [6]. Currently provide some unique parameters that are not accessible for laser-based sources yet, but they suffer from coherence problems, and the minimum achieved pulse duration is limited to a few femtoseconds [30]. Another problem with XFELs is the difficulty in sub-fs synchronization with laser sources, which can be useful for applications in atomic, molecular, and optical (AMO) physics. Using a 10 Hz repetition rate laser system [16], delivering 7 fs pulses with 25 mJ energy at 900 nm central wavelength and better than 10−11 temporal contrast on the few-ps timescale, we experimentally investigate the dependence of the surface harmonics on the CEP of the driving field and demonstrate conditions under which isolated attosecond pulses can be generated.
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