TGG is an excellent magneto-optical crystal used in various Faraday devices(Polarizer and Isolator) in the range of 400nm-1100nm, excluding 475-500nm.
Faraday polarizer is composed of the TGG crystal rod and a special designed magnet. The polarization of the beam through the magneto-optical materials deflexes and direction of the deflection only has some relations with the direction of magnetic field and has nothing to do with the direction of the beam propagation. Optical isolator is an optical component which allows the transmission of polarized light in only one direction.
Basic properties:
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Chemical Formula
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Tb3Ga5O12
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Lattice Parameter
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a=12.355Å
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Growth Method
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Czocralski
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Density
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7.13g/cm3
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Mohs Hardness
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8.0
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Melting Point
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1725 â??
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Refractive Index
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1.954 at 1064nm
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TGG specifications HG supply:
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Standard TGG Rod Specification:
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Orientation
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[111] within ±15 arc min
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Wave Front Distortion
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< 1/8 wave
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Extinction Ratio
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> 30dB
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Diameter
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+0.00mm/-0.05mm
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Length
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+0.2mm/-0.2mm
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Chamfer
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0.10mm @ 45°
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Flatness
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< 1/10 wave at 633nm
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Parallelism
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< 30 arc Seconds
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Perpendicularity
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< 5 arc min
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Surface Quality
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10/5 Scratch/Dig
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AR coating
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<0.2%
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