期刊
NATURE PHOTONICS
卷 7, 期 11, 页码 913-918出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHOTON.2013.277
关键词
-
资金
- Ministry of University and Research [FIRB-RBAP045JF2, FIRB-RBAP06AWK3]
We report the first generation of coherent, tunable, variable-polarization, soft X-ray femtosecond pulses, generated by a seeded free-electron laser (FEL) operating in the fresh bunch, two-stage harmonic upshift configuration. Characterization of the radiation proves this FEL configuration can produce single- transverse- mode, narrow-spectral-bandwidth output pulses of several tens of microjoules energy and low pulse- to- pulse wavelength jitter at final wavelengths of 10.8 nm and below. The fresh bunch configuration enhances the FEL emission at high harmonic orders by avoiding a gain depression due to the energy spread induced by the first-stage FEL interaction. Coherent signals measured down to 4.3 nm suggest this configuration is directly scalable to photon energies that will enable scientific investigations below the carbon K-edge, including access to the L-edges of many magnetic materials, with an energy per pulse unlocking the gate for experiments in the soft X-ray region with close to Fourier-transform-limited pulses.
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