Time evolution of diffusion fringes in the Christiansen effect

When laser radiation is allowed to fall at the diffusion region separating two liquids in a Christiansen filter, a new fringe pattern appears. We termed it as “diffusion fringes”. In the present work, we have studied this interference fringe pattern and its time evolution. It has been observed that...

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Bibliographic Details
Published in:Optik (Stuttgart) 2009-05, Vol.120 (9), p.427-430
Main Authors: Mahanta, Rajib, Konwar, Mitali, Siam, Chandan, Baruah, G.D.
Format: Article
Language:English
Subjects:
Christiansen effect
Chromatic pattern
Diffusion
Exact sciences and technology
Filters, zone plates, and polarizers
Fundamental areas of phenomenology (including applications)
Optical elements, devices, and systems
Optics
Physics
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Summary:When laser radiation is allowed to fall at the diffusion region separating two liquids in a Christiansen filter, a new fringe pattern appears. We termed it as “diffusion fringes”. In the present work, we have studied this interference fringe pattern and its time evolution. It has been observed that there is a definite co-relation between the shape of the fringe pattern and the width of the diffusion region. The time evolution of this fringe patterns indicates that as diffusion region increases the circular fringe becomes elliptical and finally straight. It is believed that a detailed investigation of these diffusion fringes will throw much needed light not only on the theory of the Christiansen effect but also on the rate of diffusion between two molecules.
ISSN:0030-4026
1618-1336
DOI:10.1016/j.ijleo.2007.08.012