Methodology to study the effect of moisture on refractive index of optical adhesive

Shimin Lim; Anish Priyadarshi; Ranjan Rajoo; E. H. Wong; Subodh G. Mhaisalkar; Vaidyanathan Kripesh

doi:10.1117/12.621989

12 April 2005 Methodology to study the effect of moisture on refractive index of optical adhesive

Shimin Lim, Anish Priyadarshi, Ranjan Rajoo, E. H. Wong, Subodh G. Mhaisalkar, Vaidyanathan Kripesh

Proceedings Volume 5852, Third International Conference on Experimental Mechanics and Third Conference of the Asian Committee on Experimental Mechanics; (2005) https://doi.org/10.1117/12.621989
Event: Third International Conference on Experimental Mechanics and Third Conference of the Asian Committee on Experimental Mechanics, 2004, -, Singapore

Abstract

Optical adhesives (index-matching adhesive) serve a means of structural attachment as well as provide an optical path between connecting elements. Optical properties (such as refractive index and birefringence) of these polymeric adhesives are sensitive to environmental factors, which affects optical device performance. Thus this work attempts to develop a methodology to evaluate the impact of moisture on the refractive index of an index-matching adhesive. The return loss method was employed for monitoring the moisture dependence of refractive index of an acylate-based optical adhesive. The test was performed at a wavelength of 1.55 mm. At fixed time intervals, the return loss of the sample were measured with an optical time-domain reflectometer (OTDR) during moisture desorption. The amount of moisture present in the optical adhesive at different time was calculated with the help of desorption data. Thus, a correlation between time, the amount of moisture present and refractive index was obtained. At a constant temperature of 120°C, the refractive index of the adhesive decreases as moisture content increases. However, this decrease was more drastic for small amount of moisture absorbed at -1 x 10^-4 (% moisture content)^-1 compared to -7 x 10^-6 (% moisture content)^-1 when moisture absorption exceeds 10% of the dry sample weight.

Citation Download Citation

Shimin Lim, Anish Priyadarshi, Ranjan Rajoo, E. H. Wong, Subodh G. Mhaisalkar, and Vaidyanathan Kripesh "Methodology to study the effect of moisture on refractive index of optical adhesive", Proc. SPIE 5852, Third International Conference on Experimental Mechanics and Third Conference of the Asian Committee on Experimental Mechanics, (12 April 2005); https://doi.org/10.1117/12.621989

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KEYWORDS

Refractive index

Adhesives

Humidity

Polymers

Optical fibers

Index matching antireflective coatings

Interfaces

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