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Coherent Light with Tunable Polarization from Single-Pass Free-Electron Lasers

Tunable polarization over a wide spectral range is a required feature of light sources employed to investigate the properties of local symmetry in matter. In this Letter, we provide the first experimental characterization of the polarization of the harmonic light produced by a free-electron laser and demonstrate a method to obtain free-electron laser harmonics with tunable polarization. 
C. Spezzani et. al, DOI: 10.11033/PhysRevLett.107.084801

Figure on the left:
Nonlinear harmonic emission at 195 nm.
Upper panel: Normalized Stokes’ parameters M=I (triangles, experiments; dashed line, theory) and S=I (circles, experiments; continuous line, theory), as a function of the ratio Bx =By . Lower panel: On-axis intensity (circles, experiments; continuous line, theory), normalized to the intensity recorded when the polarization is linear horizontal, as a function of the ratio Bx =By . Relative errors are estimated to be about 15%. 

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Coherent Light with Tunable Polarization from Single-Pass Free-Electron Lasers
C. Spezzani1, E. Allaria1, M. Coreno2, B. Diviacco1E. Ferrari3,1, G. Geloni4, E. Karantzoulis1, B. Mahieu5,1M. Vento1, and G. De Ninno5,1 
1Sincrotrone Trieste, S.S. 14 km 163.5, Basovizza (Trieste), Italy
2CNR-IMIP, Montelibretti (Rome), Italy
3Trieste University, Italy
4European XFEL GmbH, Hamburg, Germany
5University of Nova Gorica, Slovenia
DOI: 10.1103/PhysRevLett.107.084801 
Last Updated on Friday, 16 December 2011 21:07