High temperature infrared absorption of CVD diamond measured by laser calorimetry

Samples with a room temperature absorption coefficient of α=0.096 cm−1 and α=0.85 cm−1 were investigated. Despite this large difference, the absolute increase of the absorption coefficient with increasing temperature was found to be similar for the two samples. It increased by a value of about 0.5 cm−1 between 0 and 500 °C.