Second harmonic FEL oscillation.
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.
Neil
G R
GR
Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA. neil@jlab.org
Benson
S V
SV
Biallas
G
G
Gubeli
J
J
Jordan
K
K
Myers
S
S
Shinn
M D
MD