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A: Fachverband Atomphysik

A 16: Interaction with strong or short laser pulses I

A 16.8: Vortrag

Dienstag, 24. März 2015, 16:15–16:30, C/kHS

Narrowband inverse Compton scattering x-ray sources at high laser intensities — •Daniel Seipt¹, Sergey Rykovanov¹, Andrey Surzhykov¹, and Stephan Fritzsche^1,2 — ¹Helmholtz-Institut Jena, Fröbelstieg 3, 07743 Jena — ²Universität Jena, Institut für Theoretische Physik, 07743 Jena

Narrowband x- and gamma-ray sources based on inverse Compton scattering of laser light suffer from a limitation of the allowed laser intensity due to the onset of nonlinear effects, which limits the photon yield. At high laser intensity the ponderomotive force changes the electrons’ longitudinal velocity and leads to a variable red-shift during the scattering such that the scattered radiation’s spectral bandwidth increases. In this talk I will discuss the possibilities to use chirped laser pulses to compensate this ponderomotive broadening and to reduce the bandwidth of the spectral lines, which would allow to operate narrowband Compton sources in the high-intensity regime [1]. The optimal frequency modulation of the initial laser pulse is derived from the strong-field QED scattering matrix element for nonlinear Compton scattering in the Furry picture, where the electron recoil and spin are taken into account [2].

[1] B. Terzić et. al., Phys. Rev. Lett. 112, 074801 (2014).

[2] D. Seipt et. al., to appear.