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Development prototype systems for holographic read-only-memory (ROM) are demonstrated, capable of high density recording at 406.7 nm wavelength with 0.71 numerical aperture optics. A phase-conjugate Fourier transform lens is developed for improved capacity and tolerances and incorporated into a fully functional compact reader about 1 cm in height. The capacity target for the first generation is 4 Gbytes in a 42 × 35 mm 2 media card. Two-step mastering, replication, and playback are demonstrated for digital audio stored in 125 holograms.©2008 The Japan Society of Applied Physecs.

Original publication




Journal article


Japanese Journal of Applied Physics

Publication Date





5909 - 5911