Study on making color hologram of large object

Based on analyzing the relationship among the hologram spatial frequency, the object size and the hologram record distance in making the color hologram by twostep method,a method for making color hologram of large objects was proposed. Firstly, the tricolor hologram H1rgb was recorded in visual plane after intercalating right parameters, so as to make sure the full information were recorded in the least area and when H1rgb placed in the same plane, their reappeared images could overlap. Then, the overlapped images were recorded to acquire the color hologram after the information of objects were enlarged by the conjugate light. This method can enlarge the field of view(FOV) and sit for making hologram of large objects. It is verified by experiment that the FOV can be widen by 6 times.