IR-laser-radiation-induced changes in the infrared absorption spectra of thin polymer films

Edward Bormashenko; Roman Pogreb; Avigdor Shishnev; Evgeny Shulzinger; Yelena Bormashenko; Abraham Katzir

doi:10.1117/12.404757

19 October 2000 IR-laser-radiation-induced changes in the infrared absorption spectra of thin polymer films

Edward Bormashenko, Roman Pogreb, Avigdor Shishnev, Evgeny Shulzinger, Yelena Bormashenko, Abraham Katzir

Proceedings Volume 4094, Optical and Infrared Thin Films; (2000) https://doi.org/10.1117/12.404757
Event: International Symposium on Optical Science and Technology, 2000, San Diego, CA, United States

Abstract

The presented work demonstrates that powerful laser radiation causes changes in absorbance spectra of epoxy resin and polyethylene. Thin polymer films were located between infrared AgBrCl optical fibers and exposed to the radiation of CO₂ laser. The outpot of the laser source has been varied in the range 0-8.5 Wt. Absorbance spectra were measured by FTIR spectrophotometer. It was revealed that characteristic absorbance peaks of polymers decay under the powerful IR light. The apparent dependence of peak magnitude on IR radiation power has been established. The mathematical theory of the observed effect was worked out. Authors suggested that the effect under discussion is caused by oxygen-free thermal action of IR radiation on the chemical structure of polymer materials. The revealed effect could be effectively used for the lowering of losses in adhesive contacts of IR optic elements. The novelty of the proposed method lies in the fact that thermal treatment is localized strictly in adhesive contact, optical elements to be contacted (fibers, lenses, etc.) which are highly transparent in IR don't experience the IR radiation, but polymer adhesive is subjected to a temperature rise.

Citation Download Citation

Edward Bormashenko, Roman Pogreb, Avigdor Shishnev, Evgeny Shulzinger, Yelena Bormashenko, and Abraham Katzir "IR-laser-radiation-induced changes in the infrared absorption spectra of thin polymer films", Proc. SPIE 4094, Optical and Infrared Thin Films, (19 October 2000); https://doi.org/10.1117/12.404757

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