6 February 2012 Ultra low absorption glasses and optical coatings for reduced thermal focus shift in high power optics
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Abstract
High average laser power is required for industrial applications such as laser cutting and welding. However, system performance is often limited by the achievable beam quality and focal length stability, both of which are degraded by absorption in the transmissive components of the system. We explore in detail the behavior of uncoated and AR-coated surfaces of Suprasil 3001, Corning 7980, and Spectrosil 2000 fused silica with respect to both surface and bulk absorption in order to separate substrate effects from coating effects. Ion-beam sputtered AR coatings are shown to contribute < 0.3 ppm of absorption per coated surface regardless of substrate material, potentially allowing design flexibility in the selection of substrate materials at the system level.
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D. T. Carpenter, C. S. Wood, O. Lyngnes, N. G. Traggis, "Ultra low absorption glasses and optical coatings for reduced thermal focus shift in high power optics", Proc. SPIE 8239, High Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications, 82390Y (6 February 2012); doi: 10.1117/12.905462; https://doi.org/10.1117/12.905462
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