Department of Physics, Huzhou Teachers College, Huzhou, China.
Opt Lett. 2013 Jul 15;38(14):2578-80. doi: 10.1364/OL.38.002578.
We introduce a new class of partially coherent sources of Schell type with cosine-Gaussian spectral degree of coherence and confirm that such sources are physically genuine. Further, we derive the expression for the cross-spectral density function of a beam generated by the novel source propagating in free space and analyze the evolution of the spectral density and the spectral degree of coherence. It is shown that at sufficiently large distances from the source the degree of coherence of the propagating beam assumes Gaussian shape while the spectral density takes on the dark-hollow profile.
我们介绍了一类具有余弦-高斯光谱相干度的部分相干 Schell 源，并证实了这些源在物理上是真实的。此外，我们推导出了在自由空间中传播的新型光源产生的光束的互光谱密度函数的表达式，并分析了光谱密度和光谱相干度的演化。结果表明，在离光源足够远的距离处，传播光束的相干度呈现高斯形状，而光谱密度则呈现暗空心轮廓。
