Three-dimensional shift selectivity in reflection-type holographic disk memory with speckle shift recording.
Three-dimensional shift selectivity of a reflection-type hologram with speckle shift recording is investigated experimentally and numerically. We build an experimental setup consisting of lenses with numerical apertures of 0.28 and an iron-doped LiNbO(3) with a thickness of 0.5 mm. The experimental results show that three-dimensional selectivity has a size of 0.97 microm x 0.97 microm x 8.8 microm in diffraction efficiency. We also develop a volume holographic memory simulator to evaluate the experimental results. The simulator can quantitatively evaluate bit error rate, signal-to-noise ratio, and diffraction efficiency. Numerical results are in good agreement with the experimental results. The experimental and numerical results indicate that three-dimensional shift multiplexing can increase the storage capacity.
Miura
Masato
M
Graduate School of Science and Technology, Kobe University, Rokkodai 1-1, Nada, Kobe 657-8501, Japan. masato@brian.cs.kobe-u.ac.jp
Matoba
Osamu
O
Nitta
Kouichi
K
Yoshimura
Takeaki
T