Patent ID: 7688698
Filing Date: 2010-03-30
Classification: G02B,G03H,G11B

Abstract:
1. A method of holographic recording, comprising the steps of: forming a laser beam into a collimated beam having an expanded diameter and then dividing the diameter into an object beam and a reference beam; modulating the divided object beam according to information to be recorded; making these object and reference beams incident on the reflective surface of a rotating polygon mirror, while maintaining collimated beam shapes and being adjacent to each other, through a condenser lens having a focal point behind the reflective surface of the polygon mirror; and moving the object and reference beams reflected on the reflective surface in a scanning direction determined by the angle change of the reflective surface, and meanwhile making the object and reference beams incident on a holographic recording medium moving in the same direction as the scanning direction with angles different from each other so as to interfere with each other within the holographic recording medium.