Phys. Rev. Lett. 86, 5902–5905 (2001)Characterization of a High-Gain Harmonic-Generation Free-Electron Laser at SaturationReceived 18 January 2001; published in the issue dated 25 June 2001 We report on an experimental investigation characterizing the output of a high-gain harmonic-generation (HGHG) free-electron laser (FEL) at saturation. A seed CO2 laser at a wavelength of 10.6μm was used to generate amplified FEL output at 5.3μm. Measurement of the frequency spectrum, pulse duration, and correlation length of the 5.3μm output verified that the light is longitudinally coherent. Investigation of the electron energy distribution and output harmonic energies provides evidence for saturated HGHG FEL operation. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.86.5902
DOI:
10.1103/PhysRevLett.86.5902
PACS:
41.60.Cr
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