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arXiv · 1507.08868

Caustic structures in the spectrum of x-ray Compton scattering off electrons driven by a short intense laser pulse

D. Seipt·A. Surzhykov·S. Fritzsche·B. Kampfer
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Abstract

We study the Compton scattering of x-rays off electrons that are driven by a relativistically intense short optical laser pulse. The frequency spectrum of the laser-assisted Compton radiation shows a broad plateau in the vicinity of the laser-free Compton line due to a nonlinear mixing between x-ray and laser photons. Special emphasis is placed on how the shape of the short assisting laser pulse affects the spectrum of the scattered x-rays. In particular, we observe sharp peak structures in the plateau region, whose number and locations are highly sensitive to the laser pulse shape. These structures are interpreted as spectral caustics by using a semiclassical analysis of the laser-assisted QED matrix element.

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D. Seipt, A. Surzhykov, S. Fritzsche, B. Kampfer. 2015-07-31. Caustic structures in the spectrum of x-ray Compton scattering off electrons driven by a short intense laser pulse. https://doi.org/10.1088/1367-2630/18/2/023044

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