奇异光束方位像差的敏感性及其校正
Susceptibility to and correction of azimuthal aberrations in singular light beams
摘要：
我们展示了方位角光学像差对奇异光束的影响如何导致束腰或焦点扩展函数（PSF）中的强度调制，该强度调制与所施加的相位像差的幅度成正比。即使在良好校正的光学系统中，所产生的失真也足以显著降低奇异光束的效用。然而，我们表明，这些强度调制的图案与所施加的像差的方位角顺序有关，我们建议如何使用它来测量这些像差。我们演示了一个闭环系统，使用液晶空间光调制器作为可编程衍射光学元件，以生成光束并基于来自CCD检测到的焦点扩散函数的强度图像的反馈来校正感测到的像差。
英文摘要：
We show how the effects of azimuthal optical aberrations on singular light beams can result in an intensity modulation in the beam waist or focal point spread function (PSF) that is directly proportional to the amplitude of the applied phase aberration. The resulting distortions are enough to significantly degrade the utility of the singular beams even in well corrected optical systems. However we show that pattern of these intensity modulations is related to the azimuthal order of the applied aberration and we suggest how this can be used to measure those aberrations. We demonstrate a closed loop system using a liquid crystal spatial light modulator as a programmable diffractive optical element to both generate the beam and correct for the sensed aberrations based on feedback from a CCD detected intensity image of the focal point spread function.
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