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We report evidence for the first generation of XUV spectra from relativistic surface high-harmonic generation (SHHG) on plasma mirrors at a kilohertz repetition rate, emitted simultaneously and correlated to the emission of energetic electrons. We present measurements of SHHG spectra and electron angular distributions as a function of the experimentally controlled plasma density gradient scale length $L_mathrm{g}$ for three increasingly short and intense driving pulses: 24~fs (9 optical cycles) and $a_0=1.1$, 9~fs (3.5 optical cycles) and $a_0=1.8$, and finally 4~fs (1.7 optical cycles) and $a_0approx2.0$. For all driver pulses, we observe relativistic SHHG in the range $L_mathrm{g}in[lambda/25,lambda/10]$, with an optimum gradient scale length of $L_mathrm{g}approxlambda/15$.
High intensity laser-plasma interactions produce a wide array of energetic particles and beams with promising applications. Unfortunately, high repetition rate and high average power requirements for many applications are not satisfied by the lasers,
A new parameter regime of laser wakefield acceleration driven by sub-petawatt femotsecond lasers is proposed, which enables the generation of relativistic electron mirrors further accelerated by the plasma wave. Integrated particle-in-cell simulation
Experiments on the excitation of propagating surface plasmons (SPs) by ultrashort, high intensity laser interaction with grating targets are reviewed. At intensities exceeding $10^{19}~mbox{W cm}^{-2}$ on target, i.e. in the strongly relativistic reg
We report the enhancement of individual harmonics generated at a relativistic ultra-steep plasma vacuum interface. Simulations show the harmonic emission to be due to the coupled action of two high velocity oscillations -- at the fundamental $omega_L
A method for the controlled generation of intense high frequency electromagnetic fields by a breaking Langmuir wave (relativistic flying mirrors) in a gradually inhomogeneous plasma is proposed. The wave breaking threshold depends on the local plasma