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arXiv 1207.6019physics.optics
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非整数OAM光束结构不变传输的位置测量

Position measurement of non-integer OAM beams with structurally invariant propagation

A. M. Nugrowati, W. G. Stam, J. P. Woerdman

摘要:

提出了一种利用厄米-拉盖尔-高斯(HLG)模产生携带非整数轨道角动量(OAM)的结构传播不变光束的设计。与以前的技术不同,当改变OAM时,我们的光束的对称轴是固定的;这简化了使用象限检测器进行光束位置测量的校准技术。我们还证明了分析和实验的OAM值和HLG模式的方向起着重要的作用,在象限探测器的响应。象限探测器在光束中心最敏感的假设并不总是适用于各向异性光束轮廓,如HLG光束。

英文摘要:

We present a design to generate structurally propagation invariant light beams carrying non-integer orbital angular momentum (OAM) using Hermite-Laguerre-Gaussian (HLG) modes. Different from previous techniques, the symmetry axes of our beams are fixed when varying the OAM; this simplifies the calibration technique for beam positional measurement using a quadrant detector. We have also demonstrated analytically and experimentally that both the OAM value and the HLG mode orientation play an important role in the quadrant detector response. The assumption that a quadrant detector is most sensitive at the beam center does not always hold for anisotropic beam profiles, such as HLG beams.

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