Abstract
The radiation of a relativistic electron interacting with a co-propagating tightly focused high-power laser is investigated. High-order fields (HOFs) existing in a tight focus (a few micrometers or so) affect the dynamics of electrons rather significantly so as to enhance radiation intensity by several orders of magnitude. In the case of a co-propagating interaction geometry, the second-order field plays an important role in radiation enhancement. It is demonstrated that when HOFs are included, the radiation efficiency is increased by a factor of up to 100 000 for w0 = 2 and 5 μm, with a laser intensity of 2.2×1020 W cm−2, compared with that when HOFs are not included. The enhancement is larger for smaller electron energies and laser beam waists.It has also been shown that when an electron bunch interacts with a high-intensity tightly-focused femtosecond laser pulse in a co-propagation geometry, attosecond (∼300 as) x-ray pulses can be produced. The photon energy can reach about 40 keV for an electron energy of 2 GeV. The physical scheme investigated in this work can be used for an ultrafast (attosecond or femtosecond) x-ray source in the range of 10–100 keV.
Highlights
It has been shown that when an electron bunch interacts with a highintensity tightly-focused femtosecond laser pulse in a co-propagation geometry, attosecond (∼300 as) x-ray pulses can be produced
We demonstrate that the effect of High-order fields (HOFs) existing in a tight focus regime on the relativistic nonlinear Thomson scattered (RNTS) radiation by a relativistic electron co-propagating with a laser is dramatic: (i) the radiation intensity per electron can be enhanced 100 000 times and (ii) a few keV photons are produced
When a laser is focused tightly, the HOFs cannot be neglected: they affect the dynamics of electrons rather significantly so as to enhance radiation intensity by several orders of magnitude
Summary
It has been shown that when an electron bunch interacts with a highintensity tightly-focused femtosecond laser pulse in a co-propagation geometry, attosecond (∼300 as) x-ray pulses can be produced. We demonstrate that the effect of HOFs existing in a tight focus regime on the relativistic nonlinear Thomson scattered (RNTS) radiation by a relativistic electron co-propagating with a laser is dramatic: (i) the radiation intensity per electron can be enhanced 100 000 times and (ii) a few keV photons are produced. We note from equation (1.2) that for 2(γ ε) , the second term is dominant: non-paraxial HOFs become important This is clearly shown, which shows the transverse component of Lorentz force near focus exerting on a relativistic 100 MeV electron co-propagating with a laser of 5 μm beam waist. The electron starts to co-propagate in the +z-direction along with the laser pulse and passes through the best focus of the laser field
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