Abstract

A theoretical and experimental study of photothermal behavior in a commercially available optical path adhesive is described. Photothermal effects were examined for cw and pulsed laser radiation (∼1 µs) at 1550 nm. A fiber-optic backreflection technique was used to measure the thermo-optic glass transition temperature of the adhesive. This transition temperature was then used to calibrate fiber-optic photothermal blooming and backreflection pump–probe experiments. Simple thermal models predict ΔT at 300 mW (cw) to be 65 °C and 53 °C at 100 W (pulsed). Experimental results are in reasonable agreement with theoretical predictions. The characteristic photothermal relaxation time after a 1-µs pulse for optical path adhesives is found to be 166 µs at the end of a fiber where the mode field diameter is 10.5 µm. Photothermally induced temperatures were found to be below the thermal degradation temperature of the adhesive even at powers as high as 1 W (cw) or 100 W (pulse).

© 2001 Optical Society of America

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