FINE PATTERN PRODUCING DEVICE, AND HOLOGRAPHIC MEMORY RECORDING AND REPRODUCING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a two-beam interference aligner capable of producing a cyclic fine pattern having an optional pitch and inclination with high contrast. SOLUTION: The light intensity ratio of two laser beams made incident on a photosensitive medium in the medium is adjusted by using a light quantity adjusting means 30 so that the value of visibility V may be V>=0.8. Thus, the visibility of interference fringe is increased and the contrast of the interference light is made high.