Abstract
We show theoretically and by simulations how coherent transition radiation from tilted surfaces can be used for characterization of attosecond free-electron pulses such as used for pump-probe electron microscopy and diffraction. The tilted geometries eliminate velocity-mismatch and beam-diameter effects, providing sensitivity to attosecond times even for almost arbitrarily large beam diameters.
Highlights
Attosecond electron pulses produced by optical modulation allow pump-probe diffraction and microscopy of sub-light-cycle dynamics [1,2]
We show theoretically and by simulations how coherent transition radiation from tilted surfaces can be used for characterization of attosecond free-electron pulses such as used for pump-probe electron microscopy and diffraction
The emitted bandwidth is inversely proportional to the pulse duration, but in typical geometries the emitted spectrum is substantially damped in the short-wavelength region by the influence of the lateral size of the electron beam [3], which causes destructive optical interference that prevents the direct characterization of attosecond pulses
Summary
Attosecond electron pulses produced by optical modulation allow pump-probe diffraction and microscopy of sub-light-cycle dynamics [1,2]. We show theoretically and by simulations how coherent transition radiation from tilted surfaces can be used for characterization of attosecond free-electron pulses such as used for pump-probe electron microscopy and diffraction. We study whether coherent transition radiation (CTR) is a viable method for electron pulse characterization.
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