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Farady Crystal

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Farady Crystal

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Farady Crystal

Faraday Crystals serve as core functional devices for MT-Optics, Inc. in optical communication and high-power laser systems, enabling magnetic field modulation of light polarization based on the magneto-optical Faraday effect. They are key components for unidirectional transmission devices like optical isolators and circulators. The product portfolio includes mainstream materials such as Yttrium Iron Garnet (YIG), Tellurium Gallium Garnet (TGG), and Cerium-Doped Yttrium Aluminum Garnet (Ce:YAG), supporting customization in various sizes (from small to large apertures and lengths). With high Verdet constants (e.g., for TGG at 1064 nm) and low temperature coefficients, these crystals meet rigorous demands in optical communications, laser processing, and scientific research.

  • Terbium Gallium Garnet (TGG) is the rightcrystal material for Farady devices(Rotator and Isolator). The Farady ratatoris made up of a TGG rod contained in a special designed magnet. Thepolarization of a light beam passing through the rotator makes rotation.Thedirection of rotation is only dependent on the direction of the magnetic fieldand not on the direction of propagation of the light beam.The optical isolatorconsists of a 45 degree rotator set between two suitably arrayed polarizerswhich allow a light beam to pass through in one direction only. With acombination of excellent properties, such as large verdet constant,low lightloss, high thermal conductance and high light damage threshold,TGG is theunique material for Farady devices. It is widely used for YAG lasers andTi:sapphire tunable lasers,ring Lasers,etc.
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