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Abstract:
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This thesis has discussed the development of a new metal ion doped
panchromatic photopolymer for various holographic applications. High-quality
panchromatic holographic recording material with high diffraction efficiency, high
photosensitivity and high spatial resolution is one of the key factors for the successful
recording of true colour holograms. The capability of the developed material for multicolour
holography can be investigated.In the present work, multiplexing studies were carried out using He-Ne laser
(632.8 nm). Multiplexing can be done using low wavelength lasers like Ar+ ion (488 nm)
and frequency doubled Nd: YAG (532 nm) lasers, so as to increase the storage capacity.
The photopolymer film studied had a thickness of only 130 Cm. Films with high
thickness (~500 Cm) is highly essential for competitive holographic memories .
Hence films with high thickness can be fabricated and efforts can be made to record
more holograms or gratings in the material.In the present study, attempts were made to record data page in silver doped
MBPVA/AA photopolymer film. Image of a checkerboard pattern was recorded in the
film, which could be reconstructed with good image fidelity. Efforts can be made to
determine the bit error rate (BER) which provides a quantitative measure of the image quality of the reconstructed image . Multiple holographic data pages can also be
recorded in the material making use of different multiplexing techniques.Holographic optical elements (HOEs) are widely used in optical sensors, optical
information processing, fibre optics, optical scanners and solar concentrators . The
suitability of the developed film for recording holographic optical elements like lenses,
beam splitters and filters can be studied.The suitability of a reflection hologram recorded in acrylamide based
photopolymer for visual indication of environmental humidity is reported . Studies
can be done to optimize the film composition for recording of reflection holograms.An improvement in the spatial resolution of PVA/acrylamide based
photopolymer by using a low molecular-weight poly (vinyl alcohol) binder was recently
reported . Effect of the molecular weight of the binder matrix on the holographic
properties of the developed photopolymer system can be investigated.Incorporation of nanoparticles into photopolymer system is reported to
enhance the resolution and improve the dimensional stability of the system .
Hence efforts can be made to incorporate silver nanoparticles into the photopolymer
and its influence on the holographic properties can be studied.This thesis was a small venture towards the realization of a big goal, a
competent holographic recording material with excellent properties for practical
holographic applications. As a result of the present research, we could successfully
develop an efficient panchromatic photopolymer system and could demonstrate its
suitability for recording transmission holograms and holographic data page. The
developed photopolymer system is expected to have significant applications in the
fields of true-color display holography, wavelength multiplexing holographic storage,
and holographic optical elements. Highly concentrated and determined effort has yet to
be put forth for this expectation to become a reality. |