共查询到20条相似文献,搜索用时 140 毫秒
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利用有源增益薄片近似代替有源腔中的增益介质和采用Fox-Li迭代法,我们获得了微型DPL的圆形有源介质F-P腔的模模模型,同时还分析了腔稳态场的振幅和相位分布分别受腔的菲涅耳数N和非饱和增益增量△G影响的情况。数值计算结果与文献报道的实验情况比较一致。 相似文献
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利用有源增益薄片近似代替有源腔中的增益介质和采用Fox-Li迭代法,我们获得了微型DPL的圆形有源介质F-P腔的横模模型,同时还分析了腔稳态场的振幅和相位分布分别受腔的菲涅耳数N和非饱和增益增量ΔG影响的情况。数值计算结果与文献报道的实验情况比较一致。 相似文献
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从实验结果讨论了影响用LiF:F_2~-晶体调Q的Nd:YAG激光器的输出能量和脉冲宽度这两个参数的因素,从而可设计出符合订货规格要求的激光器。 相似文献
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《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1966,54(10):1329-1334
The integral equation of a "flat-roof resonator" is solved by the Fox and Li method of iteration in a number of particular cases. Mode patterns, phase shifts, and power losses are derived. A good overall agreement is found with the approximate theory previously developed by Toraldo di Francia. Some experimental tests carried out on a microwave model give a further confirmation of the theoretical predictions. 相似文献
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为研究涡旋光束在空间中的传播特性,首先从理论上对利用螺旋相位板获取涡旋光束的基本原理进行了推导,并得出影响涡旋光束光斑半径尺寸的详细因素。然后基于设计好的螺旋相位板模型,对具有不同拓扑荷数涡旋光束的传播过程进行了细致的模拟分析和实验验证。结果表明,光斑半径会随着光束传输距离的增加而逐渐变大,并且随着拓扑荷数的增大光斑展宽程度也会相应明显。最后验证了基于螺旋相位板叠加获取新型拓扑荷数涡旋光束的实验方法。该结论为激光应用中实现不同性质微粒的微控制提供了具体的指导。 相似文献
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The properties of unstable resonators with an additional mirror inside or outside the resonator were investigated, both experimentally and theoretically. It was found that the additional mirror excites the converging wave so that output coupling is decreased without affecting beam quality. Experiments were performed with a pulsed Nd:YAG system; the theoretical model was based on the coupled Kirchhoff integrals and solved numerically by the Fox and Li algorithm. Agreement between theory and experiments indicates that this kind of resonator provides high focusability and maximum extraction efficiency simultaneously, even with low-gain media. This enables one to apply unstable resonators to solid-state lasers with low small-signal gain such as alexandrite or CW-pumped Nd:YAG 相似文献
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本文依据菲涅耳-基尔霍夫衍射积分方程,在IBM-PC机上用数值计算方法计算出激光谐振腔(条状腔)光场的振幅分布和相位分布,并将计算结果用三维图形模拟展示出自再现模形成的动态过程,其数值计算及三维绘图的结果与福克斯和厉鼎毅的结果相符,因而提供了一种用计算机图形技术辅助设计激光腔的新方法. 相似文献
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利用部分相干理论模拟多模激光束的光滑化 总被引:3,自引:2,他引:1
本文利用部分相干理论研究了高阶厄米-高斯光束通过随机位相片的变换。数值模拟的结果表明:通过选择合适的随机相位片参数,可以得到均匀化的光强分布。这一结果与已有实验相一致。 相似文献
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本文根据边界波衍射理论分析了圆孔及相位片的衍射现象,得出其轴上光强的解析表达式,并对高斯光束经相位片射后的轴上光强进行了数值计算和讨论。得到在一定条件的轴上最大衍射光光强可达入射光强的9倍。 相似文献
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The growth and saturation characteristics of a Cherenkov laser with a Bragg cavity composed of dielectric gratings are investigated in detail with the aid of numerical simulation based upon the fluid model of the electron beam, For the analysis of the problem, a two-dimensional (2-D) model of the Cherenkov laser is considered which consists of a planar relativistic electron beam and a parallel plate waveguide, one plate of which is loaded with a dielectric sheet. For confinement and extraction of the electromagnetic wave, a Bragg cavity is formed by dielectric gratings fabricated at both ends of a dielectric-loaded parallel plate waveguide. The result of numerical simulation shows that a compact Cherenkov laser, the longitudinal dimension of which is about one order of magnitude smaller than that of the corresponding single-pass Cherenkov laser, can be realized by using a Bragg cavity composed of dielectric gratings 相似文献