Coherence and dimensionality of intense spatio-spectral twin beams
Coherence and dimensionality of intense spatio-spectral twin beams
复制标题
强空谱双光束的相干性和维数
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
J. Peřina
中科院分区：
文献类型：
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作者：
J. Peřina
在参数近似和傍轴近似下，利用空间和光谱模式分解，分析了双光束从低强度到高强度转换的空间光谱特性。在谱域和时域以及横波矢量和晶体输出平面上确定并比较了强度自相关函数和相互相关函数。光谱相干性、时间相干性和横波矢量相干性随着泵浦光强的增加而增加，但由于晶体输出面的模态结构，输出面的相干性实际上与泵浦光强无关。当泵浦强度较大时，相应的自相关函数和互相关函数相互接近。比较几种方法确定了双光束的纠缠维数。
Spatio-spectral properties of twin beams at their transition from low to high intensities are analyzed in parametric and paraxial approximations using the decomposition into paired spatial and spectral modes. Intensity auto- and cross-correlation functions are determined and compared in the spectral and temporal domains as well as the transverse wave-vector and crystal output planes. Whereas the spectral, temporal and transverse wave-vector coherence increases with the increasing pump intensity, coherence in the crystal output plane is practically independent on the pump intensity owing to the mode structure in this plane. The corresponding auto- and cross-correlation functions approach each other for larger pump intensities. Entanglement dimensionality of a twin beam is determined comparing several approaches.