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A new light beam termed as a cosh-squared-Gaussian beam (ChSGB) which may be one of solutions of the paraxial wave equation for propagation in complex optical systems has been introduced. Their beam propagation factor (M2-factor) is derived and schemes to generate this light beams are proposed. 相似文献
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PropagationandBeamQualityofFlattenedHermite-GaussBeams¥HUARenzhong;QIANLiejia,FANDianyuan;DENCXiming(ShanghaiInstituteofOptic... 相似文献
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By using the second-order moment of the power density, the beam width, far-field divergence angle and M2 factor of nonparaxial truncated flattened Gaussian (FG) beams are derived analytically. It is shown that the M2 factor of nonparaxial truncated FG beams depends not only on the truncation parameter δ and beam order N, but also on the initial waist-width to wavelength ratio w0/λ. The far-field divergence angle approaches an asymptotic value of θmax=63.435° when the truncation parameter δ → 0. For the special cases of N = 0 and δ → ∞ our results reduce to those of nonparaxial truncated Gaussian beams and nonparaxial untruncated FG beams, respectively. 相似文献
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SupportedbytheNationalNaturalScienceFoundationofChina.1.IntrodtlctionInourprcviOLISbaper[1J,x\'ehavcstLldicdthepropagati0n0ff1attencdHermite}Gaussbeams(FGHlls)infreespace,bytakingthcmasc0hercntsuperimpositi0nofHermite-Gaussbcamsofevcndrder.Inpracticaluse,suchbcamsareusualIyf0cuscdbyalens.'Sincetrans-formation0fhighordcrHermite-Gaussbcamsbythin]enscanbestudicdana1yticalIy,wecandcscribetheficlddistributions0fFGHllsafterathinlensalongpropagati0naxikexp1icitly,andwriteouttheirbeamspotsiz… 相似文献
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本文在含时量子系统传播子的ABCD形式理论的基础上.进一步讨论原子激光这种品质因子不守恒系统的传输。利用准连续的原子激光在传输过程中所满足薛定谔方程.并引入某一方向的束宽、发散角、曲率半径和品质因子等光束传输参量来表征横向势能满足x和y分量相互独立的原子激光的传输。如果某一方向上品质因子也守恒,就可以通过解析不同过程品质因子守恒的充要方程,找到原子激光在各过程中ABCD形式的传播子。本文讨论原子激光在从玻色-爱因斯坦凝聚体(BEC)中穿出过程。在磁化捕获器打开情况下的传输,以及在自由空间的传输这三个满足横向势能可分且各横向品质因子守恒条件的过程中ABCD形式的传播子。本文还将所运用的方法和所得结果与Yann等人的方法和结果进行了比较。 相似文献
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A phase superposition approach for generating arbitrarily accelerating beams is proposed, where the superimposed phase is composed of multiple sub‐phases, each of which determines an independent sub‐beam or sub‐trajectory. Further, an effective algorithm is developed to improve the uniformity of the intensity along the arbitrary trajectory by introducing phase‐shift factors. Experimental results are consistent with numerical simulations. The proposed method can be extended to nonparaxial fields, and it also breaks the previous trajectory restrictions. The arbitrarily accelerating optical beams can pave the way for optically moving particles along a predefined trajectory. The property of such beams following arbitrary trajectories is likely to give rise to new applications in wave front control, flexible optical manipulation, and optical transport and guidance of particles. 相似文献
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非傍轴光束的光束质量因子.I特性分析 总被引:3,自引:0,他引:3
使用傅里叶变换和施瓦兹不等式证明:非傍轴标量光束的M2因子存在有一个只能无限趋近、却永远都不可能达到的下限1;并对一些与此相关的问题进行了讨论 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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相干合成光束在湍流大气中的传输 总被引:4,自引:0,他引:4
分析了湍流大气对相干合成光束传输的影响,根据广义惠更斯-菲涅耳原理,对相干合成光束在不同强度湍流大气中传输进行计算,对接收平面处的光强分布的统计特性,如桶中功率(PIB)曲线、局部功率曲线进行比较.研究结果表明,较弱的湍流大气对相干合成光束的传输影响较小,接收平面的光强分布以及PIB曲线基本不变;随着湍流强度的增大,相干合成光束的光强分布和PIB曲线产生显著变化,光斑扩展和能量的弥散速度加快,光束的能量集中度显著降低.计算了湍流大气传输后光束的空间相干度,认为空间相干度下降是降低相干合成效果的原因,对如何降低湍流大气的影响进行讨论. 相似文献
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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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By expanding the hard-aperture function into a finite sum of complex Gaussian functions, the recurrence propagation formula of a flattened Gaussian beam through multi-apertured optical ABCD systems is derived, and the propagation of a Gaussian beam is regarded as a special case in our theoretical model. The extension to the three-dimensional case is described. Numerical examples of the beam propagation through a multiple aperture-lens system and an aperture-spatial filter are given and compared with those by the straightforward numerical integration of the Collins formula. It is shown that our analytical results give a good trade-off between the computational time and accuracy, and provide a useful tool for simulating the beam propagation through complicated optical systems including multiple apertures and spatial filters. Finally, a comparison with the previous work is made and the main results obtained in this paper are summarized. 相似文献
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平顶光束通过像散透镜的传输和光束参量的变化 总被引:1,自引:1,他引:0
对平顶光束通过像散透镜的传输和光束参量(包括束宽、束腰宽度和位置、远场发散角和M2因子)的变化做了研究.结果表明,像散使平顶光束在x方向的束腰宽度增加,远场发散角减小,实际焦点的位置远离透镜,而在y方向正相反.平顶光束的M2因子与像散无关.x、y方向束宽和远场发散角的相对误差随光束阶数,瑞利长度,像散系数和透镜焦距变化.当x、y方向的光束阶数和初始束宽相等时,几何焦面上两方向束宽的相对误差相等,但在实际焦面上不同. 相似文献