Abstract
Wavelength multiplexed holographic bit oriented memories are serious competitors for high capacity data storage systems. For data recording, two interfering beams are required whereas one of them should be blocked for readout in previously proposed systems. This makes the system complex. To circumvent this difficulty and make the device simpler, we validated an architecture for such memories in which the same two beams are used for recording and reading out. This balanced homodyne scheme is validated by recording holograms in a Lippmann architecture.
Highlights
Holographic data storage is a serious candidate for the generation of optical data storage devices with potential capacities exceeding one Terabyte for a 12 cm disk [1]
For recording, only a single beam is sent onto the disk, the counter-propagating beam being provided by a reflection of the reading beam onto a reflective unit placed on the other side of the disk
This compact structure increases the stability of the system and reduces the required coherence length of the recording source: recording of such microholograms with a white light source followed by a monochromator has even been successfully demonstrated [5, 12]
Summary
Holographic data storage is a serious candidate for the generation of optical data storage devices with potential capacities exceeding one Terabyte for a 12 cm disk [1]. We recently proposed a homodyne detection scheme in which the reflection onto the reflective unit is not modified during readout [11] This homodyne detection is especially attractive for Lippmann data storage approaches in which the mirror is in contact with the sensitive layer and is part of the recording structure (optical disk). Frequency ω , we were able to extract the beating signal between the two interfering beams, which makes the detection insensitive to the strong DC component This first demonstration validated the principle of the homodyne detection, it is not transposable to a realistic disk system in which the mirror would be in contact with the sensitive layer. In this communication we investigate a new scheme for homodyne detection that is compatible with Lippmann data disks
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