Partanen Henri, Hoenders Bernhard J, Friberg Ari T, Setälä Tero
J Opt Soc Am A Opt Image Sci Vis. 2018 Aug 1;35(8):1379-1384. doi: 10.1364/JOSAA.35.001379.
We consider electromagnetic spectral spatial coherence of random stationary light beams of arbitrary spectral width. We demonstrate that the normalized spectral coherence (or two-point) Stokes parameters and the electromagnetic spectral degree of coherence can be measured by narrowband filtering the light and detecting the spectral density and the polarization-state fringes around the optical axis of Young's interferometer. It is also shown that the normalized spectral polarization (or one-point) and coherence Stokes parameters are unaffected by filtering, and that the filtered light is strictly cross-spectrally pure. We further prove theoretically and confirm experimentally that the (time-domain) electromagnetic degree of spatial coherence of the filtered light at the pinholes does not increase when the passband of the filter is reduced.
我们考虑任意光谱宽度的随机平稳光束的电磁光谱空间相干性。我们证明，通过对光进行窄带滤波并检测杨氏干涉仪光轴周围的光谱密度和偏振态条纹，可以测量归一化光谱相干（或两点）斯托克斯参数以及电磁光谱相干度。还表明，归一化光谱偏振（或单点）和相干斯托克斯参数不受滤波影响，并且滤波后的光严格是交叉谱纯的。我们进一步从理论上证明并通过实验证实，当滤波器的通带减小时，针孔处滤波光的（时域）电磁空间相干度不会增加。
