14 July 1995 Temperature dependence of reflectance and transmittance of CO2 laser optics
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Abstract
The temperature dependence of reflectance and transmittance of commonly used CO2 laseroptics is investigated and presented. The knowledge of this dependence is not only important for a better understanding of damage mechanisms in the regime of long pulse and cw-operation, it may also be useful for engineering aspects of high power lasers. The measurements are performed for highly reflective and transmissive optics with an accuracy of +/- 2qq10-4 and a resolution better than 50ppm. The investigations are done in air to take into account the effects of the environment. Due to convection cooling, the maximum temperature is restricted to 200 degree(s) C. One observation is that oxidation of copper mirrors does not necessarily reduce the relfectance at 10.6 micrometers . Aluminum and silicon mirrors, ZnSe windows, and reflectors and germanium windows with different multilayer coatings are also investigated. The results for the uncoated metal mirrors are compared to the Drude theory.
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Wilfried Plass, Wilfried Plass, Adolf Giesen, Adolf Giesen, Helmut Huegel, Helmut Huegel, } "Temperature dependence of reflectance and transmittance of CO2 laser optics", Proc. SPIE 2428, Laser-Induced Damage in Optical Materials: 1994, (14 July 1995); doi: 10.1117/12.213760; https://doi.org/10.1117/12.213760
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