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A system for measuring the absorptance of mirrors at angles of incidence from 0° to >89° for both s- and p-polarized light is described. Photoacoustic calorimetry is used in which the piezoelectric transducer is directly attached to the back of the mirror substrate. Determination of absolute absorptance is performed using a laser energy ratiometer at near normal incidence. The procedure for accurately aligning the laser beam to the mirror surface is described, as well as a method to compensate for the transducer dependence on the laser beam footprint shape. This system has been used successfully to measure the absorptance characteristics of metal mirrors and dielectric overcoated metal mirrors at several laser wavelengths. Sample results are given. Other applications of this technique are discussed.
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Kimura et al. (1986) studied this question.
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