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Proceedings Paper

Optical measurements of plastic (polyimide) hollow waveguides for IR radiation
Author(s): Nathan I. Croitoru; Alexandra Inberg; Mark Oksman; M. Ben-David
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Paper Abstract

Hollow waveguides for infrared radiation are suitable for high power radiation and large interval of wavelengths. This has enabled to begin its preparation for several practical applications in medicine which are already investigated. One of the types of these waveguides is made from plastic (teflon) tubes and several papers were published in this field. Although the Teflon waveguides have several important advantages (high flexibility and biological suitability) for application in medicine, there are also difficulties in achieving low attenuation (low radiation losses), of the transmitted radiation, which is limiting their applications. One of the main reasons of the large losses of the transmitted radiation through these waveguides is the relative large roughness of the internal wall of the tubes which produce scattering of the incident radiation. Several attempts to reduce the roughness have given only a limited improvement since the internal wall of the Teflon tube is not easy to polish (the needed average roughness is less than 10 nm). In previous papers we have reported first results obtained in developing a new type of hollow waveguide for infrared made from polyimide which is a type of plastic with high melting temperature and which can be prepared with very flat surface roughness, less than 10 nm. In this paper we shall present new results of a study made for developing this type of plastic hollow waveguide. The attenuation was reduced to values less than 1 dB. Data about the process of etching for decreasing the roughness of the internal wall of polyimide tube and new methods of deposition of high adhesive and minimal roughness of the Ag and AgI guiding layers will be presented. Results of measurements of attenuation as a function of bending radius, coupled power and time of transmitted radiation will be shown and discussed. New type of dependence of attenuation on bending due to the mechanical properties of the polyimide tubes will be shown and discussed.

Paper Details

Date Published: 1 January 1998
PDF: 8 pages
Proc. SPIE 3199, Biomedical Systems and Technologies II, (1 January 1998); doi: 10.1117/12.301116
Show Author Affiliations
Nathan I. Croitoru, Tel Aviv Univ. (Israel)
Alexandra Inberg, Tel Aviv Univ. (Israel)
Mark Oksman, Tel Aviv Univ. (Israel)
M. Ben-David, Tel Aviv Univ. (Israel)

Published in SPIE Proceedings Vol. 3199:
Biomedical Systems and Technologies II
Francesco Baldini; Nathan I. Croitoru; Mark Russell Dickinson; Martin Frenz; Mitsunobu Miyagi; Riccardo Pratesi; Stefan Seeger, Editor(s)

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