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Science 24 March 2000:
Vol. 287. no. 5461, pp. 2237 - 2240
DOI: 10.1126/science.287.5461.2237
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Reports

Generation of Femtosecond Pulses of Synchrotron Radiation

R. W. Schoenlein, 1* S. Chattopadhyay, 2 H. H. W. Chong, 4 T. E. Glover, 3 P. A. Heimann, 3 C. V. Shank, 1 A. A. Zholents, 2 M. S. Zolotorev 2

Femtosecond synchrotron pulses were generated directly from an electron storage ring. An ultrashort laser pulse was used to modulate the energy of electrons within a 100-femtosecond slice of the stored 30-picosecond electron bunch. The energy-modulated electrons were spatially separated from the long bunch and used to generate ~300-femtosecond synchrotron pulses at a bend-magnet beamline, with a spectral range from infrared to x-ray wavelengths. The same technique can be used to generate ~100-femtosecond x-ray pulses of substantially higher flux and brightness with an undulator. Such synchrotron-based femtosecond x-ray sources offer the possibility of applying x-ray techniques on an ultrafast time scale to investigate structural dynamics in condensed matter.

1 Materials Sciences Division,
2 Accelerator and Fusion Research Division,
3 Advanced Light Source, Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
4 Applied Science and Technology Graduate Group, University of California Berkeley, Berkeley, CA 94720, USA.
*   To whom correspondence should be addressed. E-mail: rwschoenlein{at}lbl.gov

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Science. ISSN 0036-8075 (print), 1095-9203 (online)