Characterization of a High-Gain Harmonic-Generation Free-Electron Laser at Saturation

A. Doyuran; M. Babzien; T. Shaftan; L. H. Yu; L. F. DiMauro; I. Ben-Zvi; S. G. Biedron; W. Graves; E. Johnson; S. Krinsky; R. Malone; I. Pogorelsky; J. Skaritka; G. Rakowsky; X. J. Wang; M. Woodle; V. Yakimenko; J. Jagger; V. Sajaev; I. Vasserman

doi:10.1103/PhysRevLett.86.5902

Characterization of a High-Gain Harmonic-Generation Free-Electron Laser at Saturation

A. Doyuran, M. Babzien, T. Shaftan, L. H. Yu, L. F. DiMauro, I. Ben-Zvi, S. G. Biedron, W. Graves, E. Johnson, S. Krinsky, R. Malone, I. Pogorelsky, J. Skaritka, G. Rakowsky, X. J. Wang, M. Woodle, V. Yakimenko, J. Jagger, V. Sajaev, and I. Vasserman

Phys. Rev. Lett. 86, 5902 – Published 25 June 2001

Abstract

We report on an experimental investigation characterizing the output of a high-gain harmonic-generation (HGHG) free-electron laser (FEL) at saturation. A seed ${CO}_{2}$ laser at a wavelength of $10.6 μ m$ was used to generate amplified FEL output at $5.3 μ m$ . Measurement of the frequency spectrum, pulse duration, and correlation length of the $5.3 μ m$ 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.