拉盖尔-高斯光束经单缝后的光强分布和螺旋谱

Intensity Distribution and Spiral Spectra of Laguerre-Gaussian Beam Passing through a Single-Slit

根据菲涅耳衍射积分,研究了拉盖尔-高斯光束经过单缝衍射后的光强分布,发现拉盖尔-高斯光束经过单缝后衍射条纹会出现空心和发生弯曲,并与实验结果进行了比较。研究了拉盖尔-高斯光束经过单缝后的螺旋谱,发现单缝的存在会使螺旋谱展宽。给出了拉盖尔-高斯光束经过单缝衍射后的相位分布。研究结果可用于涡旋光束拓扑电荷数的测量。

Based on the Fresnel diffraction integral, the diffraction pattern of a Laguerre-Gaussian beam passing through a single-slit has been studied. It is found that the diffraction fringes of the Laguerre-Gaussian beam will dislocate and bend which have also been demonstrated by experiments. The spiral spectra of the Laguerre-Gaussian beam passing through the single-slit are also investigated. It is shown that the spiral spectra will broaden with the existence of the single-slit. In addition, the phase distribution of the Laguerre-Gaussian beam in the diffraction plane has also been investigated. The research results can be used to measure the topological charges of vortex beams.