Second harmonic FEL oscillation.
Second harmonic FEL oscillation.
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DOI：
10.1103/physrevlett.87.084801
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发表时间：
2001-09
影响因子：
8.6
通讯作者：
G. Neil;S. Benson;G. Biallas;J. Gubeli;K. Jordan;S. Myers;M. Shinn.
中科院分区：
文献类型：
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作者：
G. Neil;S. Benson;G. Biallas;J. Gubeli;K. Jordan;S. Myers;M. Shinn.
我们首次利用自由电子激光器在红外区域产生并测量了二次谐波振荡。虽然这样的激光在理想情况下是被禁止的，因为对于与摆动器完全对齐的电子束，平面波的增益在轴上为零，但横向模的反对称允许在本实验中产生足够的增益。我们的激光脉冲速率高达74.85 MHz，在2925 nm的40 nm频宽下，可以产生超过4.5 W的平均红外功率和40 kW的峰值红外功率。与预测一致，该源优先以TEM01模式照射。
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.