Sapphire Cover Glass Windows and Lenses

Contact Details

Laser Research Optics, Div. of Meller Optics Inc.
120 Corliss St.
United States
Toll Free Phone
October 11, 2016

A line of sapphire cover glass windows and lenses for industrial cutting lasers that are more durable than fused silica to reduce the need for cover glass changes is available from Laser Research Optics. Laser Research Sapphire Fiber Laser Windows feature Moh 9 hardness, which is second only to diamond and have A/R coatings on both sides to provide transmission of greater than 99.5 percent at 1.06 microns, with greater than 90 percent at 650-670 nm. Ideally suited as debris shields on 1064 nm cutting lasers, these highly polished sapphire windows permit less frequent cover glass lens changes.

Inherently more durable than fused silica windows, Laser Research Sapphire Fiber Laser Windows are capable of withstanding steel splatter, flash and debris  Featuring a 10-5 scratch-dig finish and providing 1/4 wave transmitted wavefront, they are available in 1/2” to 2” sizes. Sapphire C-Plane windows coated on one- or two-sides are also offered.

Related Glossary Terms

  • flash


    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


    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.