matlab模拟两束平面波干涉

（1）光源非单色性的影响

实际光源不是绝对的单色，包含一定的光谱宽度△λ。△λ范围内的每一种波长的光都生成各自一组干涉条纹，除零干涉级外，相互间均有位移，使条纹对比度下降。

能产生干涉条纹的最大光程差称为相干长度。与光源的光谱宽度成反比。光源的光谱宽度越小，就能在更大的光程差下观察到干涉条纹。

（2）两相干光波振幅比的影响

振幅相差越大，对比度越小。若两相干光波的振幅相差很大，两相干光波造成的强度实际上与其中较大强度的一个光波单独产生的强度没有多大区别，这时干涉场几乎为一片均匀照度，看不出干涉条纹。

-matlab simulation of plane wave two-beam interference (1) the impact of non-monochromatic light source is not absolute actual color, it contains a certain spectral width △ λ. Each of the light wavelength in the range of △ λ generates a respective set of interference fringes, in addition to the zero level outside interference, are mutually displaced so that fringe contrast decreases. It can produce interference fringes maximum optical path difference is called the coherence length. And inversely proportional to the spectral width of the light source. The smaller the spectral width of the light source, the greater can be observed under the optical path difference of interference fringes. (2) Effect of coherent light wave amplitude ratio of the two amplitudes greater the difference, the lower the contrast. If the amplitude of the two coherent lightwave vary widely, due to the strength of two coherent light intensity which is actually a large light intensity alone does not produce much dif