HackerHow are holograms possible?
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胶片记录一段曝光中的强度，不能直接保存光场的振荡相位。给物光加入相干参考光，相对相位便会影响干涉后的曝光图样，之后才能借参考光重建波前。
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The exposure takes some time, and it's influenced by the average intensity of this wave over that time.When the first beam is in sync with that reference wave, the two will constructively interfere, producing a wave that has twice the amplitude, so the film gets exposed a lot at that point.