Laser calorimeter for the determination of the absorption coefficients of thin 10.6μm windows

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Abstract
A laser calorimeter is described which allows the measurement of the infrared absorptivity of mirror and window materials between 0.5 and 8.0 mm in thickness. The quantity of infrared energy absorbed by the sample is determined accurately by comparison of the temperature rise produced by laser heating with that obtained by electrical heating of the sample. Results are reported for samples of Raytran zinc selenide.