Hologram recording apparatus and method for adjusting optical path length of laser beam of hologram recording apparatus

摘要

PROBLEM TO BE SOLVED: To provide a hologram recording apparatus and a method for adjusting the optical path length of laser light of the hologram recording apparatus, easily adjusting a difference in optical path between information laser beam and a reference laser beam to be enough smaller than the coherent length even when using a semiconductor laser having a small coherent length in the hologram recording apparatus.;SOLUTION: The hologram recording apparatus 1, which is adapted to record data by applying an information laser beam and a reference laser beam to a hologram record medium 5, includes an optical path length varying means provided for varying the optical path length of the information laser beam or the reference laser beam on the optical path of the information laser beam or the reference laser beam.;COPYRIGHT: (C)2009,JPO&INPIT