Laser Research Optics has launched a new series of Cool-Cut CO2 laser lenses that offer focal length stability and thermal damage protection. The low absorption laser lens runs cooler compared to traditional lenses.
The patented coating of the Cool-Cut lens absorbs less than 0.15% of laser energy, offers focal length stability for better quality cuts, and allows a cooler operation. The CO2 laser lenses are available in a thickness range of 0.236'' to 0.380'' with 1'' to 2'' diameter sizes and 1'' to 25'' focal lengths in 0.5'' increments.
The CO2 laser lens has greater than 99.0% transmission at 10.6 µm and has a 40-20 scratch-dig surface quality. Unlike the A/R coated lenses, the CO2 laser lenses last longer.
Source: http://www.laserresearch.net