Journal
PHYSICAL REVIEW LETTERS
Volume 86, Issue 26, Pages 5902-5905Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.86.5902
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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 10.6 mum was used to generate amplified FEL output at 5.3 mum. Measurement of the frequency spectrum, pulse duration, and correlation length of the 5.3 mum 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.
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