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

SEDL / STP / STP799-EB / STP37235S

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

Download this paper for $25 PDF (268K) View License Agreement
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

ASTM International is a member of CrossRef.