| 摘要 |
<P>PROBLEM TO BE SOLVED: To perform multiple recording of interference images in a simple configuration with high accuracy while requiring no complicated control. <P>SOLUTION: Information light L1 modulated by and exiting from a modulating means 3 is guided to a recording medium 7 through a Fourier transformation optical system 4 and an optical path shifter 20. On the recording medium 7, interference images are recorded by interference of the information light L1 and reference light L2 guided through another optical path to the recording medium 7. A deflecting means 21 of the optical path shifter 20 includes a pair of prisms 31a, 31b disposed opposing to each other through a gap. The optical path of the information light L1 transmitting through the prisms 31a, 31b is shifted parallel in a direction perpendicular to the optical axis. Therefore, by rotating the deflecting means 21 around the optical axis of the Fourier transformation optical system 4 by a shifter driving unit 22, the optical path of the information light L1 can be shifted around the optical axis while shifted in a direction perpendicular to the optical axis of the Fourier transformation optical system 4 at each time of recording an interference image. <P>COPYRIGHT: (C)2008,JPO&INPIT |
