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Single Shot Polarization Characterization of XUV FEL Pulses from Crossed Polarized Undulators.

Ferrari E, Allaria E, Buck J, De Ninno G, Diviacco B, Gauthier D, Giannessi L, Glaser L, Huang Z, Ilchen M, Lambert G, Lutman AA, Mahieu B, Penco G, Spezzani C, Viefhaus J - Sci Rep (2015)

Bottom Line: Polarization control is a key feature of light generated by short-wavelength free-electron lasers.In this work, we report the first experimental characterization of the polarization properties of an extreme ultraviolet high gain free-electron laser operated with crossed polarized undulators.We investigate the average degree of polarization and the shot-to-shot stability and we analyze aspects such as existing possibilities for controlling and switching the polarization state of the emitted light.

View Article: PubMed Central - PubMed

Affiliation: Elettra-Sincrotrone Trieste, S.S. 14-km 163.5, 34149 Basovizza, Trieste, Italy.

ABSTRACT
Polarization control is a key feature of light generated by short-wavelength free-electron lasers. In this work, we report the first experimental characterization of the polarization properties of an extreme ultraviolet high gain free-electron laser operated with crossed polarized undulators. We investigate the average degree of polarization and the shot-to-shot stability and we analyze aspects such as existing possibilities for controlling and switching the polarization state of the emitted light. The results are in agreement with predictions based on Gaussian beams propagation.

No MeSH data available.


Degree of linear polarization Plin as a function of the phase shift between the two undulator groups, when LH and LV polarization are composed in the crossed polarized undulator scheme.The dots display the individual shot-to-shot measurements for each given phase shift with the measured errorbar computed respectively as the average and RMS of the acquired data for each value of the phase shift.
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f4: Degree of linear polarization Plin as a function of the phase shift between the two undulator groups, when LH and LV polarization are composed in the crossed polarized undulator scheme.The dots display the individual shot-to-shot measurements for each given phase shift with the measured errorbar computed respectively as the average and RMS of the acquired data for each value of the phase shift.

Mentions: One of the driving motivations for studying the crossed polarized undulator scheme is to demonstrate the capability of high-gain FEL’s to change the state of the output polarization of the light by simply tuning the phase shifters installed between the undulators. Such a capability would be of great interest for a number of applications relying on dichroic effects. In the following, we focus on the consecutive undulator arrangement (Fig. 2(a)), but similar results can be obtained with the distributed scheme (Fig. 2(b)) if proper phase shifter tuning is applied29. The degree of linear polarization measured for the LH and LV crossed polarized undulator is reported in Fig. 4 as a function of the phase shift introduced between the two consecutive groups. This set of measurements has been obtained with slightly different polarimeter settings that, by increasing the e-tof signal, improve the accuracy for the degree of polarization to 0.05 with respect to 0.1 of the settings used in the measurements reported in Figs 1 and 3. By changing the phase shifter, one can, in principle, change the output radiation from linear (Plin = 1), at phase shifts of π, to circular (Plin = 0), if a phase shift is introduced. The maximum and minimum measured degree of linear polarization are respectively 70% and 45%.


Single Shot Polarization Characterization of XUV FEL Pulses from Crossed Polarized Undulators.

Ferrari E, Allaria E, Buck J, De Ninno G, Diviacco B, Gauthier D, Giannessi L, Glaser L, Huang Z, Ilchen M, Lambert G, Lutman AA, Mahieu B, Penco G, Spezzani C, Viefhaus J - Sci Rep (2015)

Degree of linear polarization Plin as a function of the phase shift between the two undulator groups, when LH and LV polarization are composed in the crossed polarized undulator scheme.The dots display the individual shot-to-shot measurements for each given phase shift with the measured errorbar computed respectively as the average and RMS of the acquired data for each value of the phase shift.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4551986&req=5

f4: Degree of linear polarization Plin as a function of the phase shift between the two undulator groups, when LH and LV polarization are composed in the crossed polarized undulator scheme.The dots display the individual shot-to-shot measurements for each given phase shift with the measured errorbar computed respectively as the average and RMS of the acquired data for each value of the phase shift.
Mentions: One of the driving motivations for studying the crossed polarized undulator scheme is to demonstrate the capability of high-gain FEL’s to change the state of the output polarization of the light by simply tuning the phase shifters installed between the undulators. Such a capability would be of great interest for a number of applications relying on dichroic effects. In the following, we focus on the consecutive undulator arrangement (Fig. 2(a)), but similar results can be obtained with the distributed scheme (Fig. 2(b)) if proper phase shifter tuning is applied29. The degree of linear polarization measured for the LH and LV crossed polarized undulator is reported in Fig. 4 as a function of the phase shift introduced between the two consecutive groups. This set of measurements has been obtained with slightly different polarimeter settings that, by increasing the e-tof signal, improve the accuracy for the degree of polarization to 0.05 with respect to 0.1 of the settings used in the measurements reported in Figs 1 and 3. By changing the phase shifter, one can, in principle, change the output radiation from linear (Plin = 1), at phase shifts of π, to circular (Plin = 0), if a phase shift is introduced. The maximum and minimum measured degree of linear polarization are respectively 70% and 45%.

Bottom Line: Polarization control is a key feature of light generated by short-wavelength free-electron lasers.In this work, we report the first experimental characterization of the polarization properties of an extreme ultraviolet high gain free-electron laser operated with crossed polarized undulators.We investigate the average degree of polarization and the shot-to-shot stability and we analyze aspects such as existing possibilities for controlling and switching the polarization state of the emitted light.

View Article: PubMed Central - PubMed

Affiliation: Elettra-Sincrotrone Trieste, S.S. 14-km 163.5, 34149 Basovizza, Trieste, Italy.

ABSTRACT
Polarization control is a key feature of light generated by short-wavelength free-electron lasers. In this work, we report the first experimental characterization of the polarization properties of an extreme ultraviolet high gain free-electron laser operated with crossed polarized undulators. We investigate the average degree of polarization and the shot-to-shot stability and we analyze aspects such as existing possibilities for controlling and switching the polarization state of the emitted light. The results are in agreement with predictions based on Gaussian beams propagation.

No MeSH data available.