Copper mirrors are the perfect choice when highest laser powers are to be achieved. These CO2 laser mirrors can be used for demanding applications from laser cutting to laser welding, because copper has a very high thermal conductivity and it is also possible to integrate cooling lines directly into the CO2 laser mirrors.
Molybdenum coated copper mirrors are used for laser welding. Due to the hardness of molybdenum, the mirror coating can be cleaned without scratching it. Molybdenum absorbs CO2 laser radiation at a higher rate than other coatings for this laser. Since a layer of molybdenum only a few micrometers thick is applied to copper substrates in these mirrors, the good thermal conductivity of the copper is retained and the CO2 laser mirrors can be passively or actively cooled without any problems.
R > 99,8 % @ AOI 45° s-pol