| 摘要 |
PURPOSE:To record a high quality two dimensional information hologram on a moving recording medium. CONSTITUTION:Two dimensional information pattern formed by a spatial light modulator 8 is irradiated by parallel beams and diffracted light beams are imaged on the surface of a recording medium surface 11 through a relay lens system 18 and 7. Thus, the image formed on the forming position has the same light wave surface of the diffracted image at the spatial light modulator 8 and the size of the image is recduced to the size decided by the magnification of the system, 18 and 7. That is, the phases of the image formed on the medium 11 are constant over the surface of the medium 11, therefore, the interference image generated by the interference between the above image and a reference beam 10 only include the carrier waves of spatial frequencies only determined by the incident angles of the reference beam 10 and signal beam 9 and no higher order spatial frequency components are inclined. Therefore, if the moving speed of the medium 11 and the spatial frequency of the carrier waves are made compatible, no degradation of higher order spatial frequency components caused by the movement of the medium occurs. Thus, an information recording device is provided with less number of errors in information recording and with a high reliability. |
