A line of zinc selenide (ZnSe) focusing lenses from Laser Research Optics (Providence, RI) is offered in various focal lengths for 200 W to 4 kW heavy steel cutting lasers. The CO2 laser lenses are offered in 1–2 in. OD sizes with thicknesses ranging from 0.250 to 0.380 in., and feature focal lengths from 3 to 10 in. in 0.5 in. increments. The lenses are optimized for 10.6 µm and come in plano-convex and -meniscus configurations, and can be supplied plain or mounted. Two versions are offered—one with standard AR coatings that provide <0.2% total absorption and another with a the company's Cool-Cut coating, which absorbs <0.15% of laser energy to protect against heat damage.
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