Extended Data Fig. 2: Birefringent voxel writing.
From: Laser writing in glass for dense, fast and efficient archival data storage
(a) Schematics of the pseudo-single-pulse writing of birefringent voxels. The single column of data voxels is formed in the y direction. Data modifications are shown in different colours to represent different azimuths. (b) Birefringent voxel azimuth dependence on the polarization of the seed and data pulses demonstrated under cold writing conditions. (c) The effect of distance (walk-off) between the seed modification and data pulses on the quality of the birefringent voxel formation: (i) under “cold writing” conditions, when the seed modification is formed in advance and then the data pulses are delivered to the same location, (ii) under pseudo-single-pulse writing conditions. (d) Birefringent voxels recorded inside the silica glass media using a pseudo-single-pulse writing technique. (i) Retardance-azimuth image and (ii) extracted 8 azimuth values plotted in polar coordinates.
