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Antireflection Coatings for High-Power Fiber Laser Optics

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Antireflection Coatings for High-Power Fiber Laser Optics

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High-power kilowatt-level fiber lasers (wavelength in spectral range 1.0 – 1.1µm) are used in important applications in macro material processing, particularly for cutting and welding metal sheets. In these applications, optics (lenses, protective windows) are needed to work properly at correspondingly high laser power and power density levels. For these optics, absorption losses are of crucial importance: absorption of laser radiation leads to increased temperature and a correspondingly higher refractive index of the optics. This changes the properties of the transmitted laser beam and can therefore impair the performance of the manufacturing process. In addition, temperature increase can cause internal mechanical stress and eventually damage the optics

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