The DuralensExtra™ is a new and improved low absorption ZnSe lens for high-power CO₂ lasers. A high performance ZnSe coating gives the DuralensExtra™ a longer life expectancy, as well as reduced thermal lensing, resulting in improved focus accuracy and stability. With an impressive absorption percentage of <0.16%, compared to <0.2% for the original Duralens™, this lens allows for maximum transmittance and minimum distortion. Environmental regulations, in relation to the management of radioactive waste, create another challenge which is overcome due to the absence of radioactive Thorium in its coating.