HOLOGRAM DEVICE

摘要

[PROBLEMS] To provide a hologram device capable of preventing intrusion of stray light or dust into a photo detector. [MEANS FOR SOLVING PROBLEMS] A light shielding member (43) having a pin hole filter (44) is arranged at a boundary between a reference light (L3) emitted from a light source and a reproduced light (L4) outputted from a hologram recording medium (1). The reproduced light (L4) passes through the pin hole (44a) formed in the pin hole filter (44) and comes into a light shielding space (26) having a photo-detecting member (42). Since the pin hole (44a) is arranged at a position of a beam waste (BW) where the beam diameter is most narrowed, it is possible to prevent detection of light other than the predetermined reproduced light (L4) by the photo-detecting member (42). Moreover, since the pin hole filter (44) is formed by a transparent substrate (44A) as a base material, it is possible to prevent intrusion of dust into the light shielding space (26).