Laser Output Couplers - Alien Photonics Laser Output Coupler is typically used as an exit mirror for Nd:YAG, Yb:YAG, Ti:Sapphire and other laser cavities. Inquire Price Sold by: Alien Photonics Ships from: Lithuania Specifications Substrate Material: BK7, FS, UVFS, CaF2, BaF2, Sapphire, ZnSe, Ge, Chalcogenide Glass, Other Wavelength: 180 nm Average Reflection: 5 % Average Transmission: 5 % Diameter: 1 mm