Method and system for forming birefringent voxels

A method, comprising:

• simultaneously generating a first seed pulse and a first data pulse, the first seed pulse and the first data pulse being spatially-separated laser pulses, and an amplitude of the first seed pulse being different from an amplitude of the first data pulse;
• focusing the first seed pulse at a first seed location in a substrate and focusing the first data pulse at a first data location in the substrate, the first seed location and the first data location being separated by a predetermined distance along a scan path, with the first seed location being ahead of the first data location in the scan path;
• subsequent to focusing the first seed pulse at the first seed location and focusing the data pulse at the first data location, simultaneously generating a second seed pulse and a second data pulse, the second seed pulse and the second data pulse being spatially-separated laser pulses, and an amplitude of the second seed pulse being different from an amplitude of the second data pulse;
• and
• focusing the second seed pulse at a second seed location in the substrate and focusing the second data pulse at a second data location in the substrate, the second seed location being separated from the second data location by the predetermined distance along the scan path, the second seed location being ahead of the first seed location and the second data location in the scan path, and wherein the second data location is the same as the first seed location resulting in formation of a birefringent voxel.