共查询到18条相似文献,搜索用时 78 毫秒
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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。 相似文献
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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。 相似文献
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硅键合SOI平面光波导探索 总被引:2,自引:1,他引:1
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。 相似文献
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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。 相似文献
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自由电子激光辐射频谱测量 总被引:1,自引:0,他引:1
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。 相似文献
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硅衬底上锗硅合金光波导的研制 总被引:4,自引:3,他引:1
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。 相似文献
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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。 相似文献
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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。 相似文献
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毫米波圆柱波导自由电子激光放大器的数值模拟 总被引:1,自引:0,他引:1
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。 相似文献
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Zongjun Shi Ziqiang Yang Zheng Liang 《International Journal of Infrared and Millimeter Waves》2003,24(11):1823-1831
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. 相似文献
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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. 相似文献
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Fruchtman A. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》1990,18(3):424-436
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 相似文献
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《中国物理C(英文版)》2017,(1)
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. 相似文献
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Kinematic and dynamic properties of a waveguide FEL 总被引:1,自引:0,他引:1
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. 相似文献