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|Author(s):||Simon G. Kaplan; Leonard M. Hanssen;|
|Title:||Normal Infrared Spectral Emittance of Al2O3|
|Abstract:||We have measured the near-normal ordinary ray transmittance and reflectance of crystalline Al2O3 from 1.6 m to 11 m and temperatures from 296 K to 582 K. The absorptance, or emittance, is derived from 1-(T+R), where T and R are the measured transmittance and reflectance. The derived emittance curves are compared with the predictions of a multi-phonon model. Generally, good agreement is found between the measured and predicted results in the region of the multi-phonon absorption edge.|