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Summary form only given. A requirement to robustly dissipate unwanted laser energy from hundreds to thousands of joules per square centimeter within the confines of vacuum spatial filters for the National Ignition Facility led to the investigation of metal as the intercepting surface. Stainless steel was studied in some detail for its suitability in this application. A regenerative zig-zag slab amplifier laser system with a single-frequency laser seed was used.