Peřina Jan
Joint Laboratory of Optics of Palacký University and Institute of Physics of the Czech Academy of Sciences, Faculty of Science, Palacký University, 17. listopadu 12, 77146, Olomouc, Czech Republic.
Sci Rep. 2019 Mar 12;9(1):4256. doi: 10.1038/s41598-019-39482-x.
Waves in the spatio-spectral and -temporal coherence of evolving ultra-intense twin beams are predicted: Twin beams with low intensities attain maximal coherence in the beam center until certain threshold intensity is reached. Then the area of maximal coherence moves with increasing intensity from the beam center towards its edges leaving the beam center with low coherence (the first coherence wave). For even larger intensities, a new coherence maximum is gradually built in the beam center with the increasing intensity and, later, it again moves towards the beam edges forming the second coherence wave. Rotationally-symmetric twin beams are analyzed within a three-dimensional model that couples spectral and spatial degrees of freedom. Relation between the twin-beam coherence and its local density of modes during the nonlinear evolution is discussed.
低强度的孪生光束在光束中心达到最大相干性，直到达到某个阈值强度。然后，最大相干区域随着强度增加从光束中心向其边缘移动，使光束中心的相干性降低（第一相干波）。对于更大的强度，随着强度增加，光束中心逐渐形成一个新的相干最大值，随后它再次向光束边缘移动，形成第二相干波。在一个耦合光谱和空间自由度的三维模型中分析了旋转对称孪生光束。讨论了非线性演化过程中孪生光束相干性与其局部模式密度之间的关系。
