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New Material Enables kW-Class Faraday Isolators

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New Material Enables kW-Class Faraday Isolators

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Faraday isolators rely on a magneto-active crystal; this is a material that, when placed in a magnetic field, will rotate the orientation of linearly polarized light. Terbium Gallium Garnet (TGG) has long been the standard magneto-active material for Faraday isolators operating in the visible and near IR spectrum. However, as the output power of industrial lasers continues to scale up, TGG’s inherent absorption and thermo-optical properties become increasingly disadvantageous. This can ultimately make the Faraday isolator the performance-limiting optical element in the laser system.

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