A line of sapphire windows designed for larger industrial cutting lasers from 4 kW and above that are highly durable replacements for debris shields are available from Laser Research Optics.

Laser Research Fiber Laser Sapphire Windows are capable of withstanding steel splatter, flash, and debris; making them a longer lasting replacement for debris shields on 1064 nm industrial cutting lasers from 4 kW and above. Reducing the typical number of lens changes, these fiber laser sapphire windows feature Moh 9 hardness which is second only to diamond.

Available in 1" to 2" sizes, Laser Research Fiber Laser Sapphire Windows have a 10-5 scratch-dig finish, ¼ wave flatness, A/R coatings on both sides, and provide > 99.5 percent transmission @ 1.07µm, with > 90 percent @ 650-670 nm. Fused silica UV grade windows coated on one or two sides are also offered.