White Paper

White Paper: Antireflection Optical Coatings For High Power Fiber Lasers

By Gherorghe Honciuc, Emiliano Ioffe, Ophir Optics Group, MKS Instruments Inc.

 In various macro laser material processing applications, various optical components such as lenses, mirrors, and windows, are used to deliver the laser beam to the processed material. As Continuous Wave (CW) fiber lasers reach power levels that exceed 10kW with diffraction-limited beam quality, the absorption in the optical components' coatings is one of the main limitations of the power-handling capabilities of the optical components. To avoid effects such as heat generation that disrupts the refractive index of glass and the properties of the propagated laser beam, coatings and substrate materials with very low absorption rates should be used.

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