31 December 2009 Process for rapid detection of fratricidal defects on optics using linescan phase-differential imaging
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Abstract
Phase-defects on optics used in high-power lasers can cause light intensification leading to laser-induced damage of downstream optics. We introduce Linescan Phase Differential Imaging (LPDI), a large-area dark-field imaging technique able to identify phase-defects in the bulk or surface of large-aperture optics with a 67 second scan-time. Potential phase-defects in the LPDI images are indentified by an image analysis code and measured with a Phase Shifting Diffraction Interferometer (PSDI). The PSDI data is used to calculate the defects potential for downstream damage using an empirical laser-damage model that incorporates a laser propagation code. A ray tracing model of LPDI was developed to enhance our understanding of its phase-defect detection mechanism and reveal limitations.
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Frank L. Ravizza, Michael C. Nostrand, Laura M. Kegelmeyer, Ruth A. Hawley, Michael A. Johnson, "Process for rapid detection of fratricidal defects on optics using linescan phase-differential imaging", Proc. SPIE 7504, Laser-Induced Damage in Optical Materials: 2009, 75041B (31 December 2009); doi: 10.1117/12.836990; https://doi.org/10.1117/12.836990
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