Duplicating method for hologram

Abstract

Abstract PURPOSE:To duplicate a copy hologram of high quality by interposing a hologram for noise removal which reflects high-order diffracted light of >=2th order generated by a master hologram substantially totally between a dry plate for copy hologram and the master hologram. CONSTITUTION:The hologram 51 for noise removal is arranged between the master hologram 11 and copy hologram dry plate. Light of 0th order and light of 1st order which are made incident on the hologram 51 from the master hologram 11 are transmitted through the hologram 51 and made incident on the copy hologram dry plate to form a hologram on the photosensitive material 25 of the copy hologram dry plate. High-order light from the master hologram 11, on the other hand, is diffracted by the hologram 51, but its angle of diffraction is larger than the critical angle of a hologram substrate 53, so the light is reflected totally by the projection end surface of the substrate 53 and never projected out. Consequently, a copy hologram formed by copying the master hologram by exposure is of high quality which does not contain any noise due to the high-order light.

Inventors

• 👤 Kozo Yamazaki
• 👤 Toshiyuki Ichikawa
• 👤 Fumio Yamagishi
• 👤 Hiroyuki Ikeda
• 👤 Yushi Inagaki

Bibliographic Details