Phys. Rev. Lett. 92, 074801 (2004) [4 pages]Femtosecond and Subfemtosecond X-Ray Pulses from a Self-Amplified Spontaneous-Emission–Based Free-Electron LaserReceived 29 August 2003; published 20 February 2004 We propose a novel method to generate femtosecond and subfemtosecond photon pulses in a free-electron laser by selectively spoiling the transverse emittance of the electron beam. Its merits are simplicity and ease of implementation. When the system is applied to the Linac Coherent Light Source, it can provide x-ray pulses the order of 1 fs in duration containing about 1010 transversely coherent photons. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.074801
DOI:
10.1103/PhysRevLett.92.074801
PACS:
41.60.Cr, 41.50.+h, 41.85.–p, 52.59.–f
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