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Neodymium doped yttrium aluminum garnet (Nd:YAG) is a commonly used laser material for solid-state high power, high PRF lasers. Gadolinium scandium gallium garnett doubled doped with neodymium and chromium (Nd:Cr:GSGG) shows higher efficiency than the Nd:YAG laser. We previously reported the bulk and surface damage thresholds of the Nd:Cr:GSGG crystal. It was shown that the bulk damage threshold of the Nd:Cr:GSGG was as high as the Nd:YAG crystal.
The surface damage threshold measurements for the Nd:YAG and the Nd:Cr:GSGG are reported in this paper. Infrared absorption spectroscopy was used to analyze surface contaminants. The data show that the organic contaminants, CHn, derived from hydrocarbon (skin oil) associated with improper parts handling, signifantly reduce the surface damage threshold.
co-doped GSGG, infrared absorption spectroscopy, laser induced damage, Nd:Cr:GSGG, Nd:YAG, optical surface contaminants, solid-state laser, surface damage
LITTON SYSTEMS, INC., APOPKA, FL