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arXiv 0907.2568physics.optics
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高斯光束经嵌入相位奇异性光栅的大角度衍射

High-angle diffraction of a Gaussian beam by the grating with embedded phase singularity

A. Bekshaev, O. Orlinska, M. Vasnetsov

摘要:

对高斯光束经沟槽分叉光栅衍射产生的涡旋光束的空间特性进行了理论和数值分析。与以前的工作相比,不再需要小角衍射条件,衍射光束可以强烈变形。这导致强度轮廓旋转和高阶OV分解成一组次级单电荷OV。定量地研究了这些效应,并与拉盖尔-高斯光束经过柱面伸缩变换后的类似特性进行了比较。与后一种情况相反,次级OV不在射束截面内的单个直线上,并且由相同射束承载的各个次级OV的形态参数通常是不同的。规定了次级OV相对于束横向尺寸的最大相对分离的条件。所得结果可用于实际产生具有预定特性的OV光束和OV阵列。

英文摘要:

Spatial characteristics of the optical-vortex (OV) beams created during the Gaussian beam diffraction by a grating with groove bifurcation are analyzed theoretically and numerically. In contrast to previous works, condition of small-angle diffraction is no longer required and the diffracted beam can be strongly deformed. This causes the intensity profile rotation and the high-order OV decomposition into a set of secondary single-charged OVs. These effects are studied quantitatively and confronted with similar properties of a Laguerre-Gaussian beam that undergoes astigmatic telescopic transformation. In contrast to the latter case, the secondary OVs do not lie on a single straight line within the beam cross section, and morphology parameters of the individual secondary OVs carried by the same beam are, in general, different. Conditions for maximum relative separation of the secondary OVs with respect to the beam transverse size are specified. The results can be used for practical generation of OV beams and OV arrays with prescribed properties.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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