STP799: Surface-to-Bulk Optical Absorption on Uncoated Sapphire and Zinc Selenide Using Photoacoustic Chopping Frequency Studies

    Fernelius, NC
    University of Dayton Research Institute, Dayton, Ohio

    Pages: 13    Published: Jan 1983


    Abstract

    Experimental photoacoustic (PA) signal amplitude and phase angle data were taken on uncoated CVD ZnSe at 10.6 μm and on (0001) oriented single crystal sapphire (Al2O3) at 1.3 μm. The data were interpreted using the Rosencwaig-Gersho theory, the McDonald-Wetsel composite-piston model and the Bennett-Forman theory. A modified version of the Rosencwaig-Gersho theory was developed which explicitly incorporates surface absorption. It was also applied to these cases. Comparisons are made with some multithickness sample studies on related materials.

    Keywords:

    Al, 2, O, 3, Bennett-Forman theory, CO, 2, laser, McDonald-Wetsel theory, Nd:YAG laser, optical absorption coefficient, optoacoustic, photoacoustic, Rosencwaig-Gersho theory, sapphire, surface optical absorption, ZnSe


    Paper ID: STP37235S

    Committee/Subcommittee: F01.02

    DOI: 10.1520/STP37235S


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