Analysis and elimination of boundary reflections in transmission holograms

✍ Scribed by A Beléndez; C Neipp; I Pascual

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 180 KB
• Volume: 30
• Category: Article
• ISSN: 0030-3992
• DOI: 10.1016/s0030-3992(99)00014-6

✦ Synopsis

Elimination of re¯ections which occur at the glass±air interface of holographic plates is an important factor to be taken into account when recording transmission holograms. If these re¯ections are not eliminated, unwanted secondary gratings are stored due to interference of the object and reference beams with the beams re¯ected at the interface. This not only gives rise to an anti-aesthetic eect, but also produces a reduction in diraction eciency and an increase in noise. We present the results obtained using a method which eliminates these unwanted re¯ections. This method, instead of using liquids, makes use of a black self-adhesive PVC masking tape stuck on the glass side of the holographic plate. We carried out a qualitative analysis of the dierent results obtained for plates with and without black PVC tape and also quantitatively analyzed the eect of the tape on the re¯ectivity of the plates as well as the density of holographic gratings. The results obtained con®rm the applicability of the method described for antihalation reduction and elimination of unwanted re¯ections that cause interference aecting the quality of the holographic image.