ROM type holographic disk using computer generated hologram

ROM type holographic disk that can be made by the optical disk cutting method and has compatibility with the recordable holographic memory was studied. Computer generated hologram data was recorded on the master disk by bit-by-bit recording. Then, after making a stamper, a holographic disk was made by the injection molding. To this holographic disk, it was confirmed that the data reproduction of low bit error rate is possible. In order to enable data reproduction by using a continuously rotating disk, the recorded data was made in such a way that random phase is given to the reproduced data. It became possible to distribute data to the entire area of the hologram and it enabled the reproduction of all the data of the hologram by reproducing a part of the hologram. This made it possible to reproduce data with a continuously rotating disk. Furthermore, the simulation showed that multiplex recoding became possible by the aperture multiplexing.