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

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