US Patent 7710844 Optical storage system

An optical storage system for storing data in an optical medium comprises an initial light source, a first sheet, a light modulator and a second sheet. The initial light source provides an initial light beam. The first sheet comprises a first surface and a second surface, wherein the initial light beam is partially reflected on the first surface to act as a reference beam, and the initial light beam partially passes the first surface, reflected on the second surface to act as a signal beam. The light modulator provides a pattern, wherein the signal beam contacts the light modulator. The second sheet comprises a third surface and a fourth surface, wherein the reference beam is reflected toward the optical medium on the third surface, the signal beam is reflected toward the optical medium on the fourth surface, and the reference beam and the signal beam interfere with each other to store the pattern into the optical medium.