Bright high-order harmonic generation with controllable polarization from a relativistic plasma mirror

Zi-Yu Chen () and Alexander Pukhov ()
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Zi-Yu Chen: Institut für Theoretische Physik I, Heinrich-Heine-Universität Düsseldorf
Alexander Pukhov: Institut für Theoretische Physik I, Heinrich-Heine-Universität Düsseldorf

Nature Communications, 2016, vol. 7, issue 1, 1-8

Abstract: Abstract Ultrafast extreme ultraviolet (XUV) sources with a controllable polarization state are powerful tools for investigating the structural and electronic as well as the magnetic properties of materials. However, such light sources are still limited to only a few free-electron laser facilities and, very recently, to high-order harmonic generation from noble gases. Here we propose and numerically demonstrate a laser–plasma scheme to generate bright XUV pulses with fully controlled polarization. In this scheme, an elliptically polarized laser pulse is obliquely incident on a plasma surface, and the reflected radiation contains pulse trains and isolated circularly or highly elliptically polarized attosecond XUV pulses. The harmonic polarization state is fully controlled by the laser–plasma parameters. The mechanism can be explained within the relativistically oscillating mirror model. This scheme opens a practical and promising route to generate bright attosecond XUV pulses with desirable ellipticities in a straightforward and efficient way for a number of applications.

Date: 2016
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DOI: 10.1038/ncomms12515

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