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Proceedings Paper

Optical Guides In CR 39 Irradiated By Ion Beams
Author(s): B. Bennamane; J. L. Decossas; J. Marcou; J. C. Vareille
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Paper Abstract

The paper deals with the increase of refractive index of polyallyl diethylenglycol carbonate (CR 39) when irradiated by proton beams at 300 keV, with th the fluence range (5 10 13 - 5 10 15 protons cm -2). Such irradiations lead to refractive indexincreases which can reach 8%, depending on the fluence of the beam, the initial value being close to 1.493. As the irradiated samples become optical waveguides, integrated optic methods enable us to study the index variations; the effective index values were obtained by means of the m-lines method. These values were then used to calculate the index profil2 by inverse WKB method. An attenuation of about 2 db cm 14 was measured for an irradiation of 10 protons cm . It was also noted that the attenuation increases with the ion beam fluence. On the other hand, the number of guide modes depends on the beam fluence and the variation of effective index versus fluence is given. Many considerations lead to consider that the index variation is mainly due to energy transfer all along the proton path. This is in good agreement with the comparison of the stopping power curve as a function of depth penetration and that of the index profile.

Paper Details

Date Published: 5 April 1989
PDF: 5 pages
Proc. SPIE 1014, Micro-Optics, (5 April 1989); doi: 10.1117/12.949408
Show Author Affiliations
B. Bennamane, University of Limoges (France)
J. L. Decossas, University of Limoges (France)
J. Marcou, University of Limoges (France)
J. C. Vareille, University of Limoges (France)

Published in SPIE Proceedings Vol. 1014:
Anna Maria Verga Scheggi, Editor(s)

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