Ten thousand data pages, each containing 768×768 pixels, have been stored in a single section of a disk-shaped, iron-doped LiNbO³ crystal using spatioangular multiplexing with a convergent spherical reference beam, leading to an areal density of 33.7bits/μm2 and a volumetric density of 6.7Gbits/cm³. The system design considerations for the achievement of the goals ensure the success of the experiment. Customer-designed Fourier transform and imaging optics with short focal length provide tightly confined object beam at the crystal and good iamge quality in the detector array. An optimized reflection configuration avoids the detrimental scattering from the crystal surface to enter the detector array. An optimzied reflection configuration avoids the detrimetnal scattering from the crystal surface to enter the detector. The images were reconstructed with good fidelity. The signal to noise ratio (SNR) was measured to be 3.6 for the worst-case in the sampled retrieved images, from which, a raw bit error rate of 1.6×10^-4 before error correction could be estimated.

Date Published: 16 September 2003
PDF: 6 pages
Proc. SPIE 5069, Optical Data Storage 2003, (16 September 2003); doi: 10.1117/12.533093

Published in SPIE Proceedings Vol. 5069:
Optical Data Storage 2003
Michael O'Neill; Naoyasu Miyagawa, Editor(s)