Abstract
High-intensity, fully coherent x-ray pulse with a tunable polarization over a wide spectral range is of great importance to many experiments. In this paper, we propose a tapered crossed-polarized undulator configuration for an x-ray free electron laser oscillator (XFELO) to produce arbitrarily polarized x-ray pulses in the hard x-ray region. A numerical example utilizing the parameters of the Shanghai High-Repetition-Rate XFEL and Extreme Light Facility (SHINE) is presented to demonstrate the generation of polarization controllable, fully coherent hard x-ray pulses with 99.9% polarization degree and 20 kHz polarization switching rate. The analysis presents that this scheme holds the possibility to be used in an energy tunable XFELO built from multiple Bragg mirrors.
Highlights
Compared to the synchrotron radiation light source, the x-ray free electron laser (XFEL) breaks new ground for x-ray science in biology, chemistry, physics, and material sciences, for it significantly improves the peak photon brilliance, as well as the ability of controlling both the temporal duration and the spectral bandwidth of produced light pulses
We propose a tapered crossed-polarized undulator configuration for an x-ray free electron laser oscillator (XFELO) to produce arbitrarily polarized x-ray pulses in the hard x-ray region
The analysis presents that this scheme holds the possibility to be used in an energy tunable XFELO built from multiple Bragg mirrors
Summary
Compared to the synchrotron radiation light source, the x-ray free electron laser (XFEL) breaks new ground for x-ray science in biology, chemistry, physics, and material sciences, for it significantly improves the peak photon brilliance, as well as the ability of controlling both the temporal duration and the spectral bandwidth of produced light pulses. The characteristics of XFELO pulses, especially the enhanced longitudinal coherence and the stability compared to the SASE XFELs, make the crossedpolarized undulator scheme greatly suitable for the polarization control of an XFELO. The crossed-polarized undulator is the best choice that enables the XFELO to change the polarization quickly at present With such polarization controllable, fully coherent x-rays, the XFELO will significantly improve the capability to generate the single-shot images of spin-resolved electronic structures [34]. We further the study of the tapered crossedpolarized undulator scheme to generate fully coherent, arbitrarily polarized hard x-ray pulses from an XFELO.
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