22 June 2015 Fast inspection of bulk and surface defects of large aperture optics in high power lasers
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Laser induced damage for nanosecond pulse duration is attributed to the existence of defects. The growth and polishing, as well as coating deposition, may induce versatile kinds of defects, including dig, scratch and inclusion. It is special important to get the information of the defects, such as size and location, which is the basis to know the origin of the defects and figures out effective techniques to eliminate it. It is quite easy to get the information of the defects with micron-level resolution, but it is time-consuming and is not suitable for fast inspection of the large aperture (hundreds of millimeters). In this work, on-the-fly image capture technique was employed to realize fast inspection of large aperture optics. A continuous green laser was employed as illumination source to enhance and enlarge the image of bulk defects. So it could detect the submicron-scale defects. A transmission microscopy with white light illumination was employed to detect the surface defect. Its field of view was about 2.8mm×1.6mm. The sample was raster scanned driving by a stepper motor through the stationary illumination laser and digital camera, and the speed to scan the sample was about 10mm/s. The results of large aperture optics proved the functions of this fast inspection technique.
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Yuan'an Zhao, Yuan'an Zhao, Guohang Hu, Guohang Hu, Shijie Liu, Shijie Liu, Kui Yi, Kui Yi, Jianda Shao, Jianda Shao, } "Fast inspection of bulk and surface defects of large aperture optics in high power lasers", Proc. SPIE 9525, Optical Measurement Systems for Industrial Inspection IX, 952534 (22 June 2015); doi: 10.1117/12.2184582; https://doi.org/10.1117/12.2184582

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