公开(公告)号：US4331936A

公开(公告)日：1982-05-25

申请号：US92801

申请日：1979-11-09

申请人： S. Perry Schlesinger ,  Thomas C. Marshall ,  David B. McDermott ,  Victor L. Granatstein ,  Robert K. Parker ,  Phillip A. Sprangle ,  Philip C. Efthimion

发明人： S. Perry Schlesinger ,  Thomas C. Marshall ,  David B. McDermott ,  Victor L. Granatstein ,  Robert K. Parker ,  Phillip A. Sprangle ,  Philip C. Efthimion

IPC分类号： H01S3/09

CPC分类号： H01S3/0903

摘要： The generation of very high power pulses of coherent electromagnetic radiation that are continuously tunable in frequency is accomplished by means of a free electron laser in which a hollow relativistic electron beam is projected along the longitudinal axis of an evacuated drift tube. A first magnetic field expands the electron beam into an annular peripheral interaction region of the drift tube where the beam interacts with a second periodic radial magnetic field. Frequency is varied by changing the electron velocity of the electron beam or by changing the periodicity of the radial magnetic field. The device can be made to operate as an oscillator by the inclusion of resonant cavity defining mirrors within the interaction region, or as an amplifier by injecting a coherent radiation signal into the interaction region. Both oscillator and amplifier functions can be incorporated into a single device. Linewidth is narrowed by utilizing a Smith-Fox interferometer to couple the generated coherent radiation into an output light pipe.

摘要翻译： 通过自由电子激光器实现在频率上连续可调谐的相干电磁辐射的非常高功率脉冲的产生，其中空心相对论电子束沿抽真空漂移管的纵向轴线投射。 第一磁场将电子束扩展到漂移管的环形外围相互作用区域，其中光束与第二周期性径向磁场相互作用。 通过改变电子束的电子速度或通过改变径向磁场的周期来改变频率。 该器件可以通过在相互作用区域中包含限定反射镜的谐振腔，或者通过将相干辐射信号注入到相互作用区域中而作为放大器而作为振荡器来操作。 振荡器和放大器功能都可以并入单个器件。 利用Smith-Fox干涉仪将所产生的相干辐射耦合到输出光管中，使线宽变窄。

公开(公告)号：US4825441A

公开(公告)日：1989-04-25

申请号：US575425

申请日：1984-01-31

申请人： Thomas C. Marshall ,  S. Perry Schlesinger ,  Arthur A. Grossman ,  Shien-Chi Chen

发明人： Thomas C. Marshall ,  S. Perry Schlesinger ,  Arthur A. Grossman ,  Shien-Chi Chen

IPC分类号： H01S3/09 ,  H01S3/00

CPC分类号： H01S3/0903

摘要： A free electron laser (FEL) is described which is used for generating highower radiation in a region of increasing guiding magnetic field before injection into an undulating low magnetic field. It includes an electron beam propagating along a guiding magnetic field B.sub.0 (approximately 10 kilo gauss) inside a hollow metallic tube used as a wave guide. Around the path of the beam, an undulator in the form of a bifilar helical winding or the like produces a periodic magnetic field B.sub.1 (approximately 0.5 to 1.0 kG). The electron motion accordingly has a substantial transverse component and the motion at the cyclotron and undulator frequencies occurs. Due to the energy exchange between the gyrating component of electron motion and an electromagnetic wave already present in the hollow tube, radiation of a calculable frequency is amplified.

摘要翻译： 描述了一种自由电子激光器（FEL），其用于在注入波动低磁场之前在增大引导磁场的区域中产生高功率辐射。 它包括在用作波导的中空金属管内部沿导向磁场B0（大约10千高斯）传播的电子束。 围绕梁的路径，以双螺旋绕组等形式的波动器产生周期性磁场B1（约0.5至1.0kG）。 因此，电子运动具有相当大的横向分量，并且发生在回旋加速器和波动器频率处的运动。 由于电子运动的旋转分量与已经存在于中空管中的电磁波之间的能量交换，可计算频率的辐射被放大。