1.5μm波导声光可调滤光器研究

对１．５μｍ波导型声光ＴＥ－ＴＭ模式转换光滤波器进行了研究。采用了可降低驱动功率的表面声波导结构。在１．５￣１．６μｍ波段实现了可调滤光，通带宽度小于２ｎｍ，达到９７￥以上转换率所需的射频驱动功率约８０ｍＷ（１９ｄＢｍ），器件总插入损耗约９ｄＢ。     

填充等离子体的切伦柯夫自由电子激光的理论分析

本文用磁流体理论研究了柱形波导填充等离子体的切伦柯夫自由电子激光器，表明该系统比普通切伦柯夫自由电子激光具有更高的工作频率和线性增长率。发现在入射电流和波导结构一定时，该系统和普通切伦柯夫自由电子激光器的增长率并不是随随电子束与介质的间距的增加而减小，而是存在一个最佳值。     

圆波导契伦柯夫自由电子激光流体描述

用磁流体理论研究了契伦柯夫自由电子激光的性质,导出了空心束驱动的圆柱对称波导契伦柯夫自由电子激光的色散关系,利用色散关系计算了契伦柯夫不稳定性增长率,给出了饱和功率的估计值,考虑了束与介质间间隙对契伦柯夫自由电子激光的影响,并就空心束与实心束情况进行了比较。     

硅键合SOI平面光波导探索

本文分析了ＳＩＭＯＸ／ＳＯＩ和ＤＷＢ／ＳＯＩ结构的性能特点。尝试用ＤＷＢ／ＳＯＩ材料制备不同波导层厚度的平面光波导样品，并测试了１．１５μｍ和１．５２３μｍ激光的ＴＥ和ＴＭ模的传输损耗。１．５２３μｍ光的ＴＥ模的最小传输损耗已达０．２７ｄＢ／ｃｍ。说明ＤＷＢ／ＳＯＩ材料是一种有潜力的光波导材料。     

自由电子激光辐射频谱测量

文章描述了在环形电子束和实心电子束自由电子激光(FEL)研究中,测量辐射频谱使用的两种方法——波导色散线和带通滤波器谱仪。介绍了测量系统的组成和特点,给出了测量结果:环形束FEL试验。辐射频率在27—38GHz内可调:实心束FEL试验,辐射频谱带宽～1.2GHz。     

超高增益的微型自由电子激光器

我们研究了自由电子激光的增益特征,发现一类具有超高增益的微型自由电子激光器,这类激光器位于远红外谱区,它由具有高质量电子束的射频直线加速器,微型摇摆器和毛细波导管组成。     

硅衬底上锗硅合金光波导的研制

报道锗硅合金在λ＝１．３μｍ的脊形单模光波导的设计，工艺及测量结果。这种光波导的传播损耗已达０．７ｄＢ／ｃｍ。脊形的高４－８μｍ，宽８－１２μｍ，均和单模光纤芯径相当，此外，其数值孔径在光波导的输入，输出端均能和单模光纤匹配，它已满足硅光集成对光波导的要求。文中最后报道了用这种锗硅合金光波导试制Ｙ分支器，并观察到二支分路输出的单模光斑。     

PE－LiTaO_3波导中的切伦科夫培频

对用质子交换法生长的ＬｉＴａＯ３（ＰＥ－ＬｉＴａＯ３）波导特性进行了研究，并利用该种波导实现了由１．０６μｍ到０．５３μｍ的切伦科夫倍频转换（ＣＳＨＧ），转换效率为１２２％／Ｗ·ｃｍ２．倍频光束质量好，垂直波导面方向的发散角度为１．３ｍｒａｄ，平行波导面方向的发散角度为３．３ｍｒａｄ．     

毫米波圆柱波导自由电子激光放大器的数值模拟

本文以单粒子理论为基础，在不计空间电荷效应的近似条件下推导了带轴向引导磁场的三维圆柱波导非线性模拟方程组。用CAGFEL程序计算、分析了在带入口区、常数摇摆器条件下两组不同物理参数的自由电子激光放大器的物理模型。计算结果可靠，物理图象合理。对于其中的第二组参数还着重考查了光波频率、输入功率和摇摆器场振幅改变对输出功率和效率的影响。上述这些计算结果对0．7MeV 自由电子激光放大器的设计和实验具有一定的参考价值。     

我国自由电子激光研究的最新进展

综述了我国一些研究单位的自由电子激光实验和理论研究，介绍并讨论了拉曼型自由电子激光、康普顿型自由电子激光以及电磁波泵浦自由电子激光和切连科夫自由电子激光等研究工作的最新结果。     

Linear Theory of Free Electron Laser with a Plasma-Loaded Cylindrical Waveguide

The dispersion characteristics of plasma–loaded free-electron laser has been analyzed using linear fluid model. The device under consideration consists of the cylindrical metallic waveguide, completely filled with background plasma and a relativistic electron beam which passes through a helical wiggler magnetic field. The result predicts that reasonable plasma density tends to improve the growth rate of the low-frequency optical wave of FEL and causes an shiftup in the operating frequency, However it has little effect on the growth rate of the high-frequency wave. In the plasma–loaded FEL, for the FEL oscillator, it may be tuned by varying the plasma density; and for the FEL amplifier, the wider frequency bandwidth is gained. A critical density n ^c _p for the background plasma density is found.     

球面腔镜对孔耦合波导自由电子激光振荡器的影响

平面波导约束的自由电子激光振荡器两端的腔镜由柱面镜改换为球面镜.利用分析估计和数值模拟方法说明对所考虑的模型问题,这一腔镜改变所带来的影响甚小.     

孔耦合自由电子激光振荡器光场横向结构特性

 孔耦合输出对自由电子激光(FEL)振荡器腔内光场的横向结构有很大的影响, 在输出镜上横模之间发生很复杂的耦合转换。基于中物院远红外自由电子激光振荡器, 研究了 孔输出波导 FEL的数值模拟, 对孔耦合及其引起的腔内光场的变化给以特别的注意, 依据数 值结果, 分析了孔耦合FEL光场横向结构的特性。     

Wave profile modification in the free electron laser with andwithout a waveguide

The modification of the transverse wave profile by the free electron laser (FEL) interaction in the collective Raman regime is considered. The gain is calculated and the transverse wave profile is found by solving for the eigenvalues and the actual eigenmodes of the system. When a waveguide is employed, a strong FEL interaction is shown to couple various vacuum waveguide modes, as was demonstrated by A. Bhattacharjee et al. (1988). When no waveguide or cavity is present, a coupling parameter which measures the strength of the interaction is identified. Expressions are derived for the gain for large and small values of the coupling parameter, corresponding to a strong optical guiding and large diffraction, respectively. Comparing the present results for the Raman regime with previous results for the strong pump regime, it is shown that the gain scales differently in each case, depending on both the regime of operation and on the beam geometry. The linear analysis is valid when the signal is small, and is useful mainly when the gain is high prior to saturation     

自由电子激光放大啁啾脉冲的数值模拟

 利用1维非定态程序对单程自由电子激光(FEL)放大器放大线性啁啾脉冲的过程进行了数值模拟,得到了不同啁啾参数的脉冲通过FEL放大器的增益曲线,计算了不同啁啾参数的脉冲被单程FEL放大器放大后的腔外压缩情况。通过对数值模拟结果的定性分析得出：影响输出脉冲宽度和峰值功率的主要因素是FEL放大器的增益线宽和啁啾参数,并以此说明,通过先使用FEL放大器放大啁啾脉冲、然后再将其在腔外压缩的方法产生超短脉冲FEL是可行的。     

Parameter design considerations for an oscillator IR-FEL

An infrared oscillator FEL user facility will be built at the National Synchrotron Radiation Laboratory at in Hefei, China. In this paper, the parameter design of the oscillator FEL is discussed, and some original relevant approaches and expressions are presented. Analytic formulae are used to estimate the optical field gain and saturation power for the preliminary design. By considering both physical and technical constraints, the relation of the deflection parameter K to the undulator period is analyzed. This helps us to determine the ranges of the magnetic pole gap,the electron energy and the radiation wavelength. The relations and design of the optical resonator parameters are analyzed. Using dimensionless quantities, the interdependences between the radii of curvature of the resonator mirror and the various parameters of the optical resonator are clearly demonstrated. The effect of the parallel-plate waveguide is analyzed for the far-infrared oscillator FEL. The condition of the necessity of using a waveguide and the modified filling factor in the case of the waveguide are given, respectively.     

Kinematic and dynamic properties of a waveguide FEL

The kinematic and dynamic properties of a waveguide FEL are described in the small signal small gain approximation in both the homogeneous and inhomogeneous regimes.