One hologram calculation method is the random phase-free method. When this method is used for an amplitude hologram, a reproduced image with a high-quality image can be obtained. However, when the random phase-free method is used for the kinoform, the reproduced image is degraded. In this study, we applied the kinoform encoding method proposed by Li to the random phase-free method to improve the reproduced image. The effectiveness of the proposed method was compared with that of the conventional method via simulations and optical experiments. Additionally, the parameters were optimized by the simulations, and the effectiveness was verified by numerical experiments.
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