Laser Research Optics has introduced a line of sapphire cover glass windows that have lower bulk absorption and about 30 times higher thermal conductivity than quartz protection glasses.
Laser Research Sapphire Fiber Laser Windows feature Mohs 9 hardness which is second only to diamond and have A/R coatings on both sides to provide transmission of > 99.5 percent @ 1.06 microns with > 80 percent @ 650-670 nm. Reducing focus shift and the deterioration of beam quality, these sapphire windows can withstand steel splatter, flash and debris better than fused silica.
Ideally suited as debris shields on 1,064 nm cutting and welding lasers, Laser Research Sapphire Fiber Laser Windows reduce the number of required lens changes on high-power lasers from 4 kW and above and extend their service lifetime. Providing a 10-5 scratch-dig finish and 1/4 wave transmitted wavefront, they are available in 0.5” and 2.0” sizes.
Related Glossary Terms
Thin web or film of metal on a casting that occurs at die partings and around air vents and movable cores. This excess metal is due to necessary working and operating clearances in a die. Flash also is the excess material squeezed out of the cavity as a compression mold closes or as pressure is applied to the cavity.
Hardness is a measure of the resistance of a material to surface indentation or abrasion. There is no absolute scale for hardness. In order to express hardness quantitatively, each type of test has its own scale, which defines hardness. Indentation hardness obtained through static methods is measured by Brinell, Rockwell, Vickers and Knoop tests. Hardness without indentation is measured by a dynamic method, known as the Scleroscope test.