Photoacoustic and laser rate calorimetry studies of the bulk and surface optical absorption coefficients of laser window materials

The surface-to-bulk optical absorption ratio, r, was obtained on a group of similar CaF 2 samples at 1.3 μm wavelength using three different experimental techniques. Laser rate calorimetry results on a series of samples with varying thickness gave r = β s β B = 0.136 cm . The two slope rate calorime...

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Bibliographic Details
Published in:Applications of surface science 1981, Vol.7 (1), p.32-45
Main Authors: Fernelius, Nils C., Dempsey, David V., O'Quinn, David B.
Format: Article
Language:English
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Summary:The surface-to-bulk optical absorption ratio, r, was obtained on a group of similar CaF 2 samples at 1.3 μm wavelength using three different experimental techniques. Laser rate calorimetry results on a series of samples with varying thickness gave r = β s β B = 0.136 cm . The two slope rate calorimetry technique was applied to a long bar and no second slope was seen. This implies that r is less than 0.3 cm. Analysis of photoacoustic chopping frequency variation studies using the Bennett-Forman theory give r = 0.07 cm about half the multithickness result. Thus all three techniques yielded consistent results.
ISSN:0378-5963
DOI:10.1016/0378-5963(81)90058-1