Measurement of the Infrared Spectral Absorptance of Optical Materials

D. L. Stierwalt, J. B. Bernstein, D. D. Kirk

The spectral absorptances of some solids have been measured in the 2- to 25-&mu and region in the temperature range 313 to 473 K by use of a modified Beckman IR-3 spectrophotometer. The emission of each sample is compared directly to a blackbody at the same temperature. Results indicate that this technique offers a most useful tool, particularly for measuring absorption coefficients of low value. © and 1963 Optical Society of America.

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Materials
Curve 1
Temperature K: 333 Wavelength Range, µm: 3.00-11.2 Geometry θ': 0° Composition (weight percent), Specifications, and Remarks: Irtran 1(2 mm thick) from Eastman Kodak Co.; hot pressed; measured in vacuum; data extracted from smooth curve.
Curve 2
Temperature K: 383 Wavelength Range, µm: 3.00-14.8 Geometry θ': 0° Composition (weight percent), Specifications, and Remarks: Above specimen and conditions.
Curve 3
Temperature K: 453 Wavelength Range, µm: 3.00-15.0 Geometry θ': 0° Composition (weight percent), Specifications, and Remarks: Above specimen and conditions.
Curve 1
Temperature K: 77 Wavelength Range, μ: 16.0-44.0 Geometry θ: 0° Composition (weight percent), Specifications and Remarks: n-type silicon; 2 mm thick; measured in vacuum; data extracted from smooth curve.
Curve 1
Temperature K: 373 Wavelength Range, μm: 2.50-25.0 Geometry θ': 0° Composition (weight percent), Specifications, and Remarks: Irtran 4 (1 mm thick) from Eastman Kodak Co.; hot pressed; measured in vacuum; data extracted from smooth curve.
Curve 2
Temperature K: 373 Wavelength Range, μm: 2.50-25.0 Geometry θ': 0° Composition (weight percent), Specifications, and Remarks: Irtran 4 (1 mm thick) from Eastman Kodak Co.; hot pressed; measured in vacuum; data extracted from smooth curve.
Curve 1
Temperature K: 333 Wavelength Range, μm: 3.00-14.3 Geometry θ': 0° Composition (weight percent), Specifications, and Remarks: Irtran 2 from Eastman Kodak Co. (2 mm thick); hot pressed; measured in vacuum; data extracted from smooth curve.
Curve 2
Temperature K: 393 Wavelength Range, μm: 3.00-15.0 Geometry θ': 0° Composition (weight percent), Specifications, and Remarks: Similar to above specimen and conditions.
Curve 3
Temperature K: 453 Wavelength Range, μm: 3.00-15.0 Geometry θ': 0° Composition (weight percent), Specifications, and Remarks: Similar to above specimen and conditions.