期刊
OPTICS EXPRESS
卷 19, 期 22, 页码 21698-21706出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.19.021698
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资金
- Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT)
- Japan Society for the Promotion of Science (JSPS)
- IMRAM
- Max-Planck Advanced Study Group at CFEL
- DFG [JI 110/2]
- MPG-MPRG
- Munich Center for Advanced Photonics
- APSA Japan
- KAKENHI [23656043, 23104708]
- Grants-in-Aid for Scientific Research [21654050, 23241033, 23656043] Funding Source: KAKEN
Second-order autocorrelation spectra of XUV free-electron laser pulses from the Spring-8 Compact SASE Source (SCSS) have been recorded by time and momentum resolved detection of two-photon single ionization of He at 20.45 eV using a split-mirror delay-stage in combination with high-resolution recoil-ion momentum spectroscopy (COLTRIMS). From the autocorrelation trace we extract a coherence time of 8 +/- 2 fs and a mean pulse duration of 28 +/- 5 fs, much shorter than estimations based on electron bunch-length measurements. Simulations within the partial coherence model [Opt. Lett. 35, 3441 (2010)] are in agreement with experiment if a pulse-front tilt across the FEL beam diameter is taken into account that leads to a temporal shift of about 6 fs between both pulse replicas. (C) 2011 Optical Society of America
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