Patent ID: 7535609
Filing Date: 2009-05-19
Classification: G03H,G11B

Abstract:
1. A hologram recording/reconstructing method for recording information of signal light as a reflection-type hologram on an optical recording medium and reconstructing the recorded information, the method comprising: emitting a laser light; generating, from the emitted laser light, a signal light and a reference light during the time of recording the information, and the reference light during the time of reconstructing the recorded information, the signal light and the reference light being linearly polarized lights; providing a half-wave plate to change the electric field oscillation direction of a light to make the electric field oscillation directions of polarization the same for the signal light and the reference light during the time of recording the information; and illuminating, during the time of recording the information, the signal light and the reference light as a recording light on a same axis from opposite surface sides of the optical recording medium, and illuminating, during the time of reconstructing the recorded information, the reference light as a reading light, wherein the method further comprises positioning a single quarter wave plate on an optical path of the reference light during the time of reconstructing the recorded information, and positioning the single quarter wave plate away from the optical path during the time of recording the information.