Determining the polarization state of an extreme ultraviolet free-electron laser beam using atomic circular dichroism

作者：Mazza T; Ilchen M; Rafipoor A J; Callegari C; Finetti P; Plekan O; Prince K C; Richter R; Danailov M B; Demidovich A; De Ninno G; Grazioli C; Ivanov R; Mahne N; Raimondi L; Svetina C; Avaldi L; Bolognesi P; Coreno M; O' Keeffe P; Di Fraia M; Devetta M; Ovcharenko Y; Moeller Th; Lyamayev V; Stienkemeier F; Duesterer S; Ueda K; Costello J T; Kazansky A K; Kabachnik N M; Meyer M^*

来源：Nature Communications, 2014, 5(1): 3648.

DOI：10.1038/ncomms4648

Ultrafast extreme ultraviolet and X-ray free-electron lasers are set to revolutionize many domains such as bio-photonics and materials science, in a manner similar to optical lasers over the past two decades. Although their number will grow steadily over the coming decade, their complete characterization remains an elusive goal. This represents a significant barrier to their wider adoption and hence to the full realization of their potential in modern photon sciences. Although a great deal of progress has been made on temporal characterization and wavefront measurements at ultrahigh extreme ultraviolet and X-ray intensities, only few, if any progress on accurately measuring other key parameters such as the state of polarization has emerged. Here we show that by combining ultra-short extreme ultraviolet free electron laser pulses from FERMI with near-infrared laser pulses, we can accurately measure the polarization state of a free electron laser beam in an elegant, non-invasive and straightforward manner using circular dichroism.

• 出版日期2014-4