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Time-resolved measurements were introduced to study the dynamic behavior of the absorptivity of metal powder under CO2 laser irradiation conditions. The absorptivity of metal powder was more than 90% under short-term laser irradiation (6-20 ms), but it was below 30% under relatively long-term laser irradiation (50-1000 ms). The experimental results propose that the dynamic change of the absorptivity is caused by time-dependent aggregation of powder particles induced by laser irradiation.
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Kizaki et al. (1993) studied this question.
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