Process for rapid detection of fratricidal defects on optics using Linescan Phase Differential Imaging
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.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 970159
- Report Number(s):
- LLNL-PROC-420837; TRN: US201003%%399
- Resource Relation:
- Journal Volume: 7504; Conference: Presented at: Boulder Damage Symposium, Boulder, CO, United States, Sep 21 - Sep 23, 2009
- Country of Publication:
- United States
- Language:
- English
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