共查询到20条相似文献,搜索用时 109 毫秒
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推导了带能散度的波导自由电子激光高、低两共振频率支的非定态增益解析公式.给出了近似显式公式,与数值模拟结果符合很好。从所得增益脉冲分布.估算了克服呆滞效应所需腔长失谐值,在时空框架内解释了自锁模机制。 相似文献
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简短总结了长波自由电子激光的现状及其未来最重要的发展方向,为讨论方便,长波是指波长长于0.5mm。长短波间的区发并非完全随意。它们具有不同的物理过程。例如,长波中主要彩和强流电子束,因而空间电荷效应变得很重要。诚然,其主要相互作用机制通常是相干拉曼散射,而不是相干康普顿散射。另外,波长较长时,由漂移管及腔中电子束的 效应及有限横向尺寸导致的色散效应将变得重要。长波自由电子激光研究的最终目标是建立总 相似文献
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罗山 《激光与光电子学进展》2001,(10):34-34
布鲁克海文国家实验室与阿贡国家实验室已演示一种高增益谐波产生自由电子激光器 ,他们希望它能导致发展出硬 X射线激光。其原理论证实验已有叙述 ,在布鲁克海文用一 0 .5MW CO2 激光的 2 0 0 ps1 .0 6 μm脉冲作种籽脉冲。种籽脉冲在一次波荡器与 4 0 Me V电子束相互作用 ,产生能量调制。色散磁铁将此能量调制转化为相干空间密度调制 ,在第二波荡器产生 5.3μm相干光。研究者计划用 Ti∶宝石激光器的 2 6 6nm的三次谐波作种籽 ,输入该装置 ,产生真空紫外光。进一步的实验可使用更多的增益级 ,使输出提高至 X射线区。用自由电子激光产生… 相似文献
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Yin Yuanzhao Yin Hejun 《电子科学学刊(英文版)》1996,13(2):164-169
The motion of a relativistic electron is analyzed in the field configuration consisting of a circular wiggler magnetic field, an axial magnetic field, and the equilibrium self-electric and self-magnetic fields produced by the non-neutral electron ring. By generating Poincare surface-of-section maps, it is shown that when the equilibrium self-fields is strong enough, the electron motions become chaotic. Although the realistic circular wiggler magnetic field destroys the inte-grability of the electron motion as the equilibrium self-fields do, the role the latter plays to make the motions become chaotic is stronger than the former does. In addition, the axial magnetic field can restrain the occurrence of the chaoticity. 相似文献
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尹元昭 《电子科学学刊(英文版)》1995,12(4):359-366
The characteristics of coherent radiation produced by a cylindrical electron beam passing through a rectangular waveguide and linearly polarized wiggler are studied. The instability analysis is based on the linearized Vlasov-Maxwell equations for the perturbations about a self-consistent beam equilibrium. The dispersion equation of TMmn mode is deduced and by making use of numerical calculation the radiation frequency and growth rate as a function of electron beam energy and radius, axial magnetic field, wiggler field and wave length are presented and discussed. 相似文献
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Wang Changbiao Liu Shenggang Chengdu Institute of Radio Engineering.Chengdu 《电子科学学刊(英文版)》1989,6(3):286-289
The spontaneous radiation from a single pulse electron beam in Free Electron Lasers is dealt withby solving one-dimensional wave equations.The obtained results show that there is the long pulse effect aswell as the well-known short pulse effect. 相似文献
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基于静电摇摆器中电势场的一种典型二维模型 ,在小振幅振动情况下讨论了相对论电子束在其中的运动规律 ,计算得到了该类型自由电子激光的自发辐射谱。上述结果与平面磁摇摆器有类似的形式 相似文献