共查询到19条相似文献,搜索用时 78 毫秒
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双曲余弦高斯光束通过有光阑限制的ABCD光学系统的传输 总被引:8,自引:0,他引:8
对双曲余弦高斯光束通过有硬边光阑的一阶ABCD光学系统的传输进行了研究,采用将矩形域函数表示为复高斯函数叠加的技巧,推导出了解析的传输公式,在特殊情况下,该公式简化为在无光阑情况下的传输公式,对双曲余弦高斯光束通过有光阑限制的薄膜镜聚焦进行了数值计算,计算结果与直接由柯林斯(Collins)公式所得结果一致,且此解析方法便于进行物理分析,可节约大量机时。 相似文献
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厄米-双曲余弦-高斯光束的瞄准稳定性 总被引:1,自引:0,他引:1
用失调叠加积分的方法 ,对厄米双曲余弦高斯光束的瞄准稳定性作了研究 ,得到了厄米双曲余弦高斯光束失调因子 ηm2 的精确解析公式和近似解析公式 ,并用数值计算了相对横向偏移和相对角向偏移对失调因子ηm2 的影响以及对精确解析公式和近似解析公式的适用范围作了分析和说明。 相似文献
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基于惠更斯菲涅尔广义衍射积分,对变量为径向平方的贝塞耳函数调制的高斯光束(QBG光束)通过有圆孔光阑限制的一阶ABCD光学系统的传输进行了研究.采用将圆域函数可表示为复高斯函数叠加的方法,推导出了普适的场分布解析公式,以QBG光束通过有圆孔光阑限制的薄透镜系统为例进行了分析与讨论,数值计算结果证明了本文所用方法的优点,所得结果与直接用广义衍射积分公式进行复杂的数值计算结果完全一致
关键词:
QBG光束
光阑
ABCD光学系统
传输特性 相似文献
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从二阶矩的定义出发,给出了一类新光束———厄光双曲正弦高斯(HShG)光束M2因子的解析公式,公式表明HShG光束的M2因子是光束阶数n和参数α的函数.作为本公式的特例,给出了厄光正弦高斯(HSiG)双束、双曲正弦高斯(ShG)光束以及正弦高斯(SiG)光束M2因子的解析公式.对HShG光束的束腰宽度、远场发散角及M2因子做了数值计算,并对所得结果作了分析.
关键词:
厄米-双曲正弦高斯光束
厄米-正弦-高斯(HSiG)光束
M2因子
二阶矩 相似文献
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厄米—双曲余弦—光斯光束的瞄准稳定性 总被引:2,自引:1,他引:1
用失调叠加积分的方法,对厄米-双曲余弦-高斯光束的瞄准稳定性作了研究,得到了厄米-双曲余弦-高斯光束失调因子|ηm|^2的精确解析公式和近似解析公式,并用数值计算了相对横向偏移和相对角向偏移对失调因子|ηm|^2的影响以及对精确解析公式和近似解析公式的适用范围作了分析和说明。 相似文献
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Taking phase error, turbulent atmosphere, jitter, vacancy factor and tilt error into consideration, we propose a general propagation formula for both coherent and incoherent combined beams with different kinds of aberrations. Comparative study on the propagation performance of coherent and incoherent combined beams is presented. Beam propagation factor (BPF) defined as laser output power in a specified far-field bucket divided by the total output power radiating from the effective near-field exit aperture of the laser beam is introduced as the beam quality factor to give a quantitative study. It is revealed that the coherent combined beam has great advantage when propagating in free-space compared with the incoherent combined beams. However, the coherent combined beam is more sensitive to the environmental aberrations, and the beam quality degrades faster with an increase in the aberrations’ intensity. Scintillation index as the high moments of the combined intensity field is also studied. It is revealed that both coherent and incoherent combined beams exhibit less scintillations compared with a single-aperture beam, and the incoherent combined beam demonstrates better scintillations reducing the performance. Our methodology offers an all-round performance evaluation on the two kinds of laser systems. 相似文献
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高功率激光多程放大系统光束传输的计算分析 总被引:6,自引:6,他引:0
报道了高功率激光多程放大系统光束传输的模拟程序, 该程序考虑了放大介质的增益分布、增益饱和、增益恢复系数、介质吸收损耗、B积分以及光阑和空间滤波器等光学元件对激光传输和放大的影响, 并给出了典型的计算实例。 相似文献
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大气激光通信中多光束传输性能分析和信道建模 总被引:32,自引:6,他引:26
多光束传输技术是克服大气激光通信中大气湍流效应的有效途径之一。首先从理论上分析了大气湍流对多光束大气激光通信系统性能的影响和多光束大气传输的光强起伏特性,然后利用统计分析的方法,建立了一个以传输距离z、光束数目n、发射孔径之间的距离St、接收孔径Dr等为参量的多光束大气传输信道模型。最后,结合相关文献提供的实验结果对该信道模型进行了实验验证和误码性能分析。结果表明,当S1≥√λz或Dr远大于大气湍流相干长度ρo时,随着n的增大,接收光强将趋于对数正态分布.降低了大气激光通信系统的误码率,从而验证了多光束传输对于克服大气湍流影响的有效性。 相似文献
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将相位翻转高斯光束的概念推广到相位翻转高阶模光束.以相位翻转厄米-高斯光束为例,推导出相位翻转高斯光束通过近轴理想(无光阑)ABCD光学系统,以及带刀口和光阑的ABCD光学系统传输的递推方程,并用以研究相位翻转高斯光束的传输特性.特别是,得出对TEM1、TEM2和TEM3模相位翻转高斯光束,光阑效应可以忽略的条件分别是截断参量δ≥2.1,2.5和 3.0. 相似文献
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An approximate analytical propagation formula of the elliptical Gaussian beams through a paraxial ABCD optical system with a circular aperture is obtained on the basis of the expansion of a hard-edged aperture into a finite sum of complex Gaussian functions. And the parameter characteristics of the truncated beams including the beam propagation factor and the kurtosis parameter are also studied in detail by using the second-order-moments method. 相似文献
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《中国物理 B》2020,(6)
Based on the generalized truncated second-order moments, an approximate analytical formula of the beam propagation factor M~2 of high-power laser beams passing through the optical system with multiple hard-edged apertures is deduced. Numerical examples of the beams passing through an aperture-spatial filter are enclosed, and the influences of amplitude modulations(AMs) and phase fluctuations(PFs) on the beam propagation quality of high-power laser beams passing through the multi-apertured ABCD optical system are considered and discussed. It is shown that PFs are able to degrade the beam propagation quality of laser beams more than AMs when the high-power laser beams passing through the aperture-spatial filter, furthermore, one or two aperture-lens optical systems configured appropriate aperture parameters are both able to upgrade the beam propagation quality of high-power laser beams. The M~2 factor of Gaussian beam passing through the multi-aperture optical system is a special case in this paper. 相似文献
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An extension of phase-flipped Gaussian (PFG) beams to the multi-mode nonparaxial case is made. The recurrence propagation expressions for phase-flipped Hermite-Gaussian (PFHG) beams beyond the paraxial approximation are derived and used to study nonparaxial propagation properties of PFHG beams in free space and through a knife edge and an aperture, and to compare nonparaxial results with paraxial ones. The propagation of paraxial PFHG beams and PFG beams and nonparaxial PFG beams is treated as special cases of nonparaxial PFHG beams. Numerical examples are given to illustrate the theoretical results. 相似文献
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相较于相干光束,部分相干光束经过湍流大气传输能够有效地抑制湍流引起的光束展宽、光斑漂移及光强闪烁等扰动效应,在自由空间光通信、激光雷达和激光遥感等方面有重要的应用前景.近年来,部分相干光束湍流大气传输研究受到越来越多学者的关注.本文回顾了部分相干光束在湍流大气中传输特性研究的发展历程、理论基础及常用的理论方法,介绍了处理光束经过湍流大气传输的相位屏数值模拟方法,以及如何把该方法运用到处理部分相干光束传输. 相似文献