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采用调节全息干涉条纹并使对比度达到最大的方法，使物光和参考光的光程差处于激光器的相干长度范围内，实现光程差的实时监控，并使全息记录光路配合达到最佳状态。此方法对使用短相干长度激光器拍摄优质全息图具有重要的意义。
By adjusting the holographic interference fringes and maximizing the contrast, the optical path difference between the object light and the reference light is within the coherence length of the laser to realize the real-time monitoring of the optical path difference and achieve the optimal combination of the holographic recording light path. This method is of great importance for the use of short coherence length lasers to take good holograms.