29 July 1992 Mapping of absorption in optical coatings
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Absorption characteristics of optical coatings have been observed using infrared photothermal radiometry as a noncontact diagnostic technique. The local laser-induced temperature rise was measured as a function of position on the coatings. The data was used to calculate the absorption of the coatings and to identify point sites with atypical absorption. The coating samples were tantala/silica multilayers designed to be high reflectors at 1.32 micrometers . The tests were done with a 1.32 micrometers , continuous-wave Nd:YAG laser and a HgCdTe infrared camera.
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Steve E. Watkins, Steve E. Watkins, Robert Heimlich, Robert Heimlich, Robert Reis, Robert Reis, } "Mapping of absorption in optical coatings", Proc. SPIE 1624, Laser-Induced Damage in Optical Materials: 1991, (29 July 1992); doi: 10.1117/12.60110; https://doi.org/10.1117/12.60110

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