Abstract
A new optical architecture for holographic data storage system which is compatible with a Blu-ray Disc™ (BD) system is proposed. In the architecture, both signal and reference beams pass through a single objective lens with numerical aperture (NA) 0.85 for realizing angularly multiplexed recording. The geometry of the architecture brings a high affinity with an optical architecture in the BD system because the objective lens can be placed parallel to a holographic medium. Through the comparison of experimental results with theory, the validity of the optical architecture was verified and demonstrated that the conventional objective lens motion technique in the BD system is available for angularly multiplexed recording. The test-bed composed of a blue laser system and an objective lens of the NA 0.85 was designed. The feasibility of its compatibility with BD is examined through the designed test-bed.
Highlights
Optical data storage (ODS) systems represented by compact disc (CD), digital versatile disc (DVD), and Blu-ray DiscTM (BD) widely spread taking advantage of their low bit cost for replication of read only disc (ROM) contents compared with magnetic or solid state storage
The holographic medium was forced to be tilted 20 deg to eliminate the directional reflection from the medium and to keep the reflected beam out from the camera because the performance of anti-reflective (AR) coating coated on the surface of HDS-3000 was external cavity laser diode (ECLD) Collimating lens HOE
The new optical architecture allows placing an objective lens with numerical aperture (NA) 0.85 parallel to a holographic medium and brings a high affinity with the geometry of optical architecture in the BD system
Summary
Optical data storage (ODS) systems represented by compact disc (CD), digital versatile disc (DVD), and Blu-ray DiscTM (BD) widely spread taking advantage of their low bit cost for replication of read only disc (ROM) contents compared with magnetic or solid state storage. Their compatibility between recordable media is found useful for personal archival storage. As long as the same technological trend is applied, further improvement of data capacity cannot be expected because material for optical components applicable to ultra-violet wavelength range is lacking, and maximum NA in air is generally limited to be
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