干涉偏差对四束圆偏振光干涉的影响

Influence of Interference Deviation on Four-Beam Interference with Circular Polarization

通过理论计算和MATLAB模拟讨论四束右旋圆偏振干涉光干涉后的光强度分布。当四束干涉光对称分布时,可得均匀的二维周期性强度分布。理论研究发现,干涉强度的最大值出现在3条直线斜率分别为S1=+1,S2=!,S3=-1的交点处,且在x和y方向存在一定的周期dx=dy=λ/sinθ。入射角的不同只改变周期的大小,不改变干涉强度分布的图样。研究发现,当其中一束干涉光发生偏差(θ1,α1)时,决定干涉强度的其中2条直线的斜率Sl(l=1,2)以及x和y方向的周期dxl,dyl(l=1,2,3)均受影响。

The interference intensity distribution of four-beam interference with right-hand circular polarization is theoretically studied and simulated with MATLAB. The impact of incident angle on the intensity distribution of interference is studied. The results show that there is a uniform two-dimensional periodic intensity distribution when four beams show symmetrical distribution. The peak intensity appears at the intersection of three lines with the slopes of S1=＋1,S2=∞,S3=-1, respectively. And there are certain periods dx =dy =3,/sin θ in the x and y directions. When incidence angle 0 changes, the period of the pattern changes accordingly but not the symmetricity of pattern. However, when the incident angle or azimuthal angle （θ1 , α1 ） changes, both the slopes Sl （l = 1,2） and periods d,t ,d.,t （l=1,2,3） change.