Single-shot measurement of free-electron laser polarization at SDUV-FEL
  In this paper, a division-of-amplitude photopolarimeter (DOAP) for measuring the polarization state of free-electron laser (FEL) pulse is described. The incident FEL beam is divided into four separate beams, and four Stokes parameters can be measured in a single-shot. In the crossed-planar undulators experiment at Shanghai deep ultraviolet FEL test facility, this DOAP instrument constructed in house responses accurately and timely while the polarization-state of fully coherent FEL pulses are switched, which is helpful for confirming the crossed-planar undulators technique for short-wavelength FELs. 
Lie Feng, Haixiao Deng, Tong Zhang, Chao Feng, Jianhui Chen, Xingtao   Wang, Taihe Lan, Lei Shen, Wenyan Zhang, Haifeng Yao,...
physics.acc-ph physics.optics