Opt Lett. 2014 Feb 15;39(4):769-72. doi: 10.1364/OL.39.000769.
Cosine-Gaussian-correlated Schell-model sources whose degree of coherence (DOC) is of circular symmetry have been introduced just recently [Opt. Lett. 38, 2578 (2013)]. In this Letter, we propose a model for a source whose DOC is the superposition of two 1D cosine-Gaussian-correlated Schell-model sources, i.e., possesses rectangular symmetry. The novel model sources and beams they generate are termed rectangular cosine-Gaussian Schell-model (RCGSM). The RCGSM beam exhibits unique features on propagation, e.g., its intensity in the far field (or in the focal plane) displays a four-beamlet array profile, being qualitatively different from the ring-shaped profile of the CGSM beam whose DOC is of circular symmetry. Furthermore, we have carried out experimental generation of the proposed beam and measured its focusing properties. Our experimental results are consistent with the theoretical predictions.
最近引入了相干度（DOC）具有圆对称性的余弦高斯相关斯奈尔模型源[Opt. Lett. 38, 2578 (2013)]。在这封信中，我们提出了一种源模型，其 DOC 是两个 1D 余弦高斯相关斯奈尔模型源的叠加，即具有矩形对称性。新颖的模型源及其产生的光束被称为矩形余弦高斯斯奈尔模型（RCGSM）。RCGSM 光束在传播过程中表现出独特的特征，例如，其远场（或焦平面）中的强度显示出四束光瓣阵列的轮廓，与 DOC 具有圆对称性的 CGSM 光束的环形轮廓定性不同。此外，我们已经进行了所提出光束的实验生成，并测量了其聚焦特性。我们的实验结果与理论预测一致。
