Second harmonic FEL oscillation |
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Authors: | Neil G R Benson S V Biallas G Gubeli J Jordan K Myers S Shinn M D |
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Institution: | Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA. neil@jlab.org |
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Abstract: | We have produced and measured for the first time second harmonic oscillation in the infrared region by a free electron laser. Although such lasing is ideally forbidden, since the gain of a plane wave is zero on axis for an electron beam perfectly aligned with a wiggler, a transverse mode antisymmetry allows sufficient gain in this experiment for lasing to occur. We lased at pulse rates up to 74.85 MHz and could produce over 4.5 W average and 40 kW peak of IR power in a 40 nm FWHM bandwidth at 2925 nm. In agreement with predictions, the source preferentially lased in a TEM01 mode. |
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