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    Second Harmonic FEL Oscillation

    We have produced and measured for the first time second harmonic oscillation in the infrared region by the high average power Jefferson Lab Infrared Free Electron Laser. Although such lasing is ideally forbidden, since gain is zero on axis for a perfect electron beam in an infinite wiggler, the finite geometry and beam emittance allows sufficient gain for lasing to occur. We were able to lase at pulse rates up to 74.85 MHz and could produce over 4.5 watts average and 40 kW peak of IR power in a 40 nm FW HM bandwidth at 2925 nm. In agreement with predictions, the source preferentially lased in a TEM01 mode. We present results of initial source performance measurements and comparisons of gain as calculated by different approaches.

    This work supported by the US Department of Energy under contract DE-AC05-84ER40150, the Office of Naval Research, the Commonwealth of Virginia, and the Laser Processing Consortium.

    Authors: George R. Neil, S.V. Benson, G. Biallas, J. Gubeli, K. Jordan, S. Myers, M. Shinn (Jefferson Lab); H.P. Freund (Science Applications International Corp., McLean, Virginia)

    Submitted for FEL 2001, Darmstadt, FRG, August 20-24, 2001

    Updated May 25, 2001



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