Holography has a wide application in medicine, optical computers,
and scanners among others. Conventional studies on analogue holograms have
mainly been conducted on image generation, processing and reconstruction. However, these conditions may vary thus
affecting hologram quality. In phase-based holograms, where amplitude
information is disregarded, the quality of the holographic image is
compromised. Since convection holography uses photosensitive recording
interference patterns in holographic material, there is a need to evaluate
aberration or how high intensity of light has been reconstructed. In this chapter, a discussion on the
fundamental parameters of holograms such as exposure time and processing
chemical composition effect in phase holograms are presented. The recording of
the holograms was carried out in a darkroom. The experiment involved the
introduction of a polarizing beam splitter (PBS) on the reference beam path.
This was done to generate the s-polarized and polarized beams. The power of the
emerging s- and p-polarized beams from the reference beam was measured. Using
the set-up plane wave transmission holograms were recorded as the commercial
half-wave plate was rotated at angles of 0.0˚, 22.5˚, 45.0˚, 67.5˚, and 90.0˚.
It is worth noting that the optimization of these parameters can result in
obtaining a phase hologram image of approximately 16% diffraction efficiency at
an exposure time of 20s. Moreover, by investigating the influence of objective
beam polarization hologram image quality can be controlled further. Finally, by
varying the polarization orientation, diffraction efficiency and fringe
visibility are greatly affected. As a result, it is possible to achieve a
Polarized phase hologram of diffraction efficiency of approximately 21.1%.
Author
(s) Details
Stephen Maina Njoroge
Department of Biological and Physical Sciences, Karatina University,
1957-10101, Karatina, Kenya.
Please see the book here:- https://doi.org/10.9734/bpi/stda/v6/4471
