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Laguerre-Gaussian beams, as a special model with spiral phase structure, have been intensively investigated. Holographic grating method is a convenient method of generating Laguerre-Gaussian beams and measuring their orbital angular momenta. But due to some inevitable adverse factors such as lateral displacement, angular deflection and elliptical incident profile of incident beam, the practical effectiveness should be reevaluated. This paper is devoted to the study on the influences of the abovementioned three adverse factors on the holographic grating method. The characteristics of the mode decomposition of diffractive order and the relative powers of the orbital angular momentum eigen-states are also given. 相似文献
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针对光束轨道角动量的研究主要集中在相干光束的研究,而对于部分空间相干光束的轨道角动量研究较少,依据部分相干光的Wigner分布函数推导出部分相干光的轨道角动量表达式,分析了部分相干光的轨道角动量谱特性。采用Mercer展开法得到了轨道角动量谱,计算了给定部分相干光束的轨道角动量谱,讨论了部分相干性对轨道角动量谱的影响。研究结果表明:部分相干光和相干光具有相同的轨道角动量表达式,部分相干光的轨道角动量谱随着相干性的变差而愈发弥散,携带轨道角动量的部分相干光束的轨道角动量谱比不携带轨道角动量的部分相干光束的轨道角动量谱更容易受相干度的影响。 相似文献
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