Factory Custom Optical Potassium Bromide KBr Windows for Infrared Imaging Systems and IR Laser Optical Setups Potassium Bromide (KBr) windows are high-performance optical components widely used in infrared (IR) spectroscopy and opticalsystems. Featuring a broad transparent range in the mid-to-far IR spectrum, they deliver ... Inquire Price FAST RESPONSE Sold by: Henan UM Optics Ltd Ships from: China Specifications Substrate Material: KBr Antireflection Coating: Uncoated Diameter: 25 mm Surface Quality: 60-40 scratch-dig Surface Flatness: lambda/4